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  • TPS54200/TPS54201 入力電圧4.5V～28V、出力電流1.5A、同期整流降圧型単色/IR LEDドライバ

    • JAJSCQ2B November   2016  – June 2018 TPS54200 , TPS54201

      PRODUCTION DATA.  

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  • TPS54200/TPS54201 入力電圧4.5V～28V、出力電流1.5A、同期整流降圧型単色/IR LEDドライバ
  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
      2.      ADIMでの優れた深調光機能
  4. 4 改訂履歴
  5. 5 概要（続き）
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed-Frequency PWM Control
      2. 8.3.2  Error Amplifier
      3. 8.3.3  Slope Compensation and Output Current
      4. 8.3.4  Input Undervoltage Lockout
      5. 8.3.5  Voltage Reference
      6. 8.3.6  Setting LED Current
      7. 8.3.7  Internal Soft Start
      8. 8.3.8  Bootstrap Voltage (BOOT)
      9. 8.3.9  Overcurrent Protection
        1. 8.3.9.1 High-Side MOSFET Overcurrent Protection
        2. 8.3.9.2 Low-Side MOSFET Overcurrent Protection
        3. 8.3.9.3 Low-Side MOSFET Reverse Overcurrent Protection
      10. 8.3.10 Fault Protection
        1. 8.3.10.1 LED-Open Protection
        2. 8.3.10.2 LED Short Protection
        3. 8.3.10.3 Sense-Resistor Short Protection
        4. 8.3.10.4 Sense-Resistor Open Protection
        5. 8.3.10.5 Overvoltage Protection
        6. 8.3.10.6 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Enable and Disable Device
      2. 8.4.2 Mode Detection
      3. 8.4.3 Analog Dimming Mode Operation
      4. 8.4.4 PWM Dimming-Mode Operation
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 TPS5420x 12-V Input, 1.5-A, 3-Piece IR LED Driver With Analog Dimming
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1 Inductor Selection
          2. 9.2.1.2.2 Input Capacitor Selection
          3. 9.2.1.2.3 Output Capacitor Selection
          4. 9.2.1.2.4 FB Pin RC Filter Selection
          5. 9.2.1.2.5 Sense Resistor Selection
        3. 9.2.1.3 Application Curves
      2. 9.2.2 TPS5420x 24-V Input, 1-A, 4-Piece WLED Driver With PWM Dimming
        1. 9.2.2.1 Design Requirements
        2. 9.2.2.2 Detailed Design Procedure
          1. 9.2.2.2.1 Inductor Selection
          2. 9.2.2.2.2 Input Capacitor Selection
          3. 9.2.2.2.3 Output Capacitor Selection
          4. 9.2.2.2.4 FB Pin RC Filter Selection
          5. 9.2.2.2.5 Sense Resistor Selection
        3. 9.2.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 デバイス・サポート
      1. 12.1.1 デベロッパー・ネットワークの製品に関する免責事項
    2. 12.2 ドキュメントのサポート
      1. 12.2.1 関連リンク
    3. 12.3 ドキュメントの更新通知を受け取る方法
    4. 12.4 コミュニティ・リソース
    5. 12.5 商標
    6. 12.6 静電気放電に関する注意事項
    7. 12.7 Glossary
  13. 13メカニカル、パッケージ、および注文情報
  14. 重要なお知らせ
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DATA SHEET

TPS54200/TPS54201 入力電圧4.5V～28V、出力電流1.5A、同期整流降圧型単色/IR LEDドライバ

このリソースの元の言語は英語です。 翻訳は概要を便宜的に提供するもので、自動化ツール (機械翻訳) を使用していることがあり、TI では翻訳の正確性および妥当性につきましては一切保証いたしません。 実際の設計などの前には、ti.com で必ず最新の英語版をご参照くださいますようお願いいたします。

1 特長

  • 4.5V～28Vの広い入力電圧範囲
  • 150mΩおよび70mΩのMOSFETを内蔵し、1.5Aの連続出力電流に対応
  • 2μAの低シャットダウン電流
  • 600kHzの固定周波数
  • 内部補償が行われるピーク電流モード
  • アナログ調光モード時200mV、PWM調光モード時100mVの検出電圧
  • PWM入力による高精度なアナログ調光(ADIM)
  • LEDの断線/短絡保護
  • 検出抵抗の断線/短絡保護
  • シャットダウン・アンド・ラッチ・モード保護(TPS54200)
  • 自動リトライ・モード保護(TPS54201)
  • サーマル・シャットダウン
  • 6ピンSOT-23-THINパッケージ

2 アプリケーション

  • 昼夜用IR LED
    • IPネットワーク・カメラ
    • アナログ・セキュリティ・カメラ
    • ビデオ・ドアベル
    • 組み込みカメラ・システム
  • LED表示/照明
    • 冷蔵庫・冷凍庫
    • 電子スマート・ロック
    • 汎用LEDドライバ
    • 建築物の照明

3 概要

TPS54200/TPS54201は1.5Aの同期整流降圧型単色/IRドライバで、最大入力電圧は28Vです。電流モード動作により、高速な過渡応答が得られ、ループを簡単に安定化できます。

TPS54200/TPS54201を使用することで、暗視カメラのように、シングル・ストリングまたはマルチストリングの単色/赤外線(IR) LEDアレイを駆動できます。

TPS54200/TPS54201はMOSFETを内蔵し、SOT-23-THINパッケージを採用しているため、高い電力密度を実現し、PCB上でわずかな面積しか占有しません。

TPS54200/TPS54201にはアナログ調光モードが実装されており、このモードではPWM信号入力のデューティ・サイクルに比例して内部基準電圧を変化させ、調光を行います。また、PWM調光モードもサポートしており、このモードでは内部基準電圧が100mVに半減して、より高い効率を実現します。

製品情報(1)

型番 パッケージ 本体サイズ（公称）
TPS54200 SOT-23-THIN (6) 1.6mm×2.9mm
TPS54201 SOT-23-THIN (6) 1.6mm×2.9mm
  1. 提供されているすべてのパッケージについては、巻末の注文情報を参照してください。

Device Images



概略回路図

TPS54200 TPS54201 alt_lusco8.gif

ADIMでの優れた深調光機能

TPS54200 TPS54201 D001_Deep_Diming_SLUSCO8_updated.gif

4 改訂履歴

Changes from A Revision (March 2017) to B Revision

  • 「特長」セクションとデータシート全体で「ヒカップ・モード」を「自動リトライ・モード」に変更Go
  • パッケージの記述を変更Go
  • 「アプリケーション」セクションを変更Go
  • 「概要」セクションの第1文で「WLED」を「単色/IR LED」に変更Go
  • 製品情報の表でパッケージの記述をSOT23からSOT-23-THINに変更Go
  • Changed pinout diagram and associated textGo
  • Changed "PWM duty input" to "PWM input duty cycle" in the Pin Functions tableGo
  • Changed "free-air" to "ambient" in the Absolute Maximum Ratings condition statementGo
  • Changed "free-air" to "ambient" in the Recommended Operating Conditions condition statementGo
  • Changed the package description in the Thermal Information table headerGo
  • Changed "Rising" and "Falling" to "Rising VPWM" and "Falling VPWM" for the VADIM, VPDIM, and VPWMElectrical Characteristics table entriesGo
  • Changed "SW" to "VSW" in the Test Conditions column for the RHSD entry in the Electrical Characteristics tableGo
  • Changed "dim mode" to "dimming mode" in the Test Conditions column for the ILIM_HS1 entry in the Electrical Characteristics tableGo
  • Changed the symbol for switching frequency from FSW to fSWGo
  • Changed VIN to VVIN in the Typical Characteristics condition statementGo
  • Changed "hiccup up mode" to "auto-retry mode" Go
  • Changed "duty" to "duty cycle" in multiple locations throughout the data sheetGo
  • Changed "PWM duty" to "PWM duty cycle" in the Figure 16 imageGo
  • Changed "floating driver" to "boot regulator" in the Bootstrap Voltage (BOOT) section Go
  • Changed VIN to VVIN in multiple locations throughout the data sheetGo
  • Changed various wording in the High-Side MOSFET Overcurrent Protection section for clarity, and changed "512 switching cycles " to "tSHUTDOWN_DELAY" Go
  • Changed "hiccup up" to "auto-retry mode" in the Fault Protection sectionGo
  • Changed "hiccup" to "auto-retry" or "shuddown -and-restart," and deleted "programmed for XXX switching cycles" textGo
  • Changed "will be clamped by low" to "is clamped at the low-"Go
  • Changed "hiccup" to "auto-retry" or "shuddown -and-restart," and deleted "programmed for XXX switching cycles" textGo
  • Changed "hiccup" to "auto-retry" or "shuddown -and-restart," and deleted "programmed for XXX switching cycles" textGo
  • Changed "hiccup" to "auto-retry" or "shuddown -and-restart," and deleted "programmed for XXX switching cycles" textGo
  • Changed "Recycle VIN can reset" to "Cycling VIN resets"Go
  • Changed "once the device shuts down, it starts" to "a device shutdown starts"Go
  • Changed "hiccup" to "auto-retry" or "shuddown -and-restart," and deleted "programmed for XXX switching cycles" textGo
  • Changed "hiccup" to "auto-retry" or "shuddown -and-restart," and deleted "programmed for XXX switching cycles" textGo
  • Changed "Vin at" to "VVIN"Go
  • Changed "VADIM" to "VADIM" and "VPDIM" to "VPDIM"Go
  • Changed "it's" to "the output is"Go
  • Changed "VIN" to "VIN" and "recycled" to "cycled" at the end of the Mode DetectionGo
  • Changed "a little big" to "excessive" in the Analog Dimming Mode Operation sectionGo
  • Changed "PWM duty cycle" to "PWM state"Go
  • Changed "12-VIN" to "12-V VVIN"Go
  • Changed "FSW" to "fSW" and "VIN(max)" to "VVIN(max)" in Equation 3 from F to fGo
  • Changed "FSW" to "fSW" and "VIN(ripple)" to "VVIN(ripple)" in Equation 8 from F to fGo
  • Changed the symbol for frequency in Equation 11 from F to fGo
  • Changed "RF" to "RF" and "CF" to "CF"Go
  • Changed "VOUT" to "VOUT" in the conditions of multiple application curvesGo
  • Changed the wording of the second and third paragraphs of the Inductor Selection section for clarityGo
  • Changed the symbol for frequency in Equation 14 from F to fGo
  • Changed "wide areas advantages" to "added width also"Go
  • Changed "reduce the possibility" to "minimize"Go
  • 「デバイス・サポート」および「ドキュメントのサポート」セクションを追加Go

Changes from * Revision (November 2016) to A Revision

  • Added TPS54201デバイスの最初のリリースをGo
  • 保護モードの説明を追加して概要を変更Go
  • Changed ILIM_HS1 and ILIM_HS2 CURRENT LIMIT.Go
  • Changed the low-side source-current limit from (2.4/3.4/4.4) to (2.3/3.3/4.4), Go
  • Added TPS54201 tHIC_THERMAL, tHIC_OV and tHIC_WAIT Timing Requirements.Go
  • Added TPS54201 LED Short Protection image.Go
  • Added TPS54201 LED Open Protection image. Go
  • Added TPS54201 Sense Resistor Short Protection image. Go

5 概要（続き）

ハイサイドMOSFETでサイクル単位の電流制限を行い、過負荷時にコンバータを保護します。また、ローサイドMOSFETのフリーホイール電流制限機能が電流暴走を防止することで、さらに保護が強化されています。ローサイドのMOSFETシンク電流制限機能は、逆方向の過電流を防止します。TPS54200/TPS54201は安全および保護機能として、LEDの断線および短絡保護、検出抵抗の断線および短絡保護、デバイス過熱保護機能を備えています。TPS54200にはシャットダウン・アンド・ラッチ・モード保護が実装され、TPS54201には自動リトライ・モード保護が採用されています。

6 Pin Configuration and Functions

DDC Package
6-Pin SOT-23-THIN
Top View

Pin Functions

PIN TYPE(1) DESCRIPTION
NAME NO.
BOOT 6 O A bootstrap capacitor is required between BOOT and SW.
FB 4 I LED current-detection feedback
GND 1 G Power ground
PWM 5 I Dimming input. Default low (internally pulled low). In analog dimming mode, the internal reference is proportional to the PWM input duty cycle. In PWM dimming mode, LED current is ON during the PWM high period in each PWM cycle.
SW 2 O Switching node to the external inductor
VIN 3 P Input supply voltage
(1) I = Input, O = Output, P = Supply, G = Ground

7 Specifications

7.1 Absolute Maximum Ratings

over operating ambient temperature range (unless otherwise noted)(1)
MIN MAX UNIT
Input voltage range, VI VIN –0.3 30 V
PWM –0.3 7
FB –0.3 7
Output voltage range, VO BOOT–SW –0.3 7 V
SW –0.3 30
SW (20 ns transient) –5 30
Operating junction temperature, TJ –40 150 °C
Storage temperature range, Tstg –65 150 °C
(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

7.2 ESD Ratings

VALUE UNIT
V(ESD) Electrostatic discharge Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) ±4000 V
Charged-device model (CDM), per JEDEC specification JESD22-C101(2) ±1500
(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

7.3 Recommended Operating Conditions

over operating ambient temperature range (unless otherwise noted)
MIN MAX UNIT
VI Input voltage range VIN 4.5 28 V
PWM –0.1 6
FB –0.1 6
VO Output voltage range BOOT-SW –0.1 6.5 V
SW –0.1 28
TJ Operating junction temperature –40 125 °C

7.4 Thermal Information

THERMAL METRIC(1) TPS5420x UNIT
DDC (SOT-23-THIN)
6 PINS
RθJA Junction-to-ambient thermal resistance 89.2 °C/W
RθJC(top) Junction-to-case (top) thermal resistance 39.5 °C/W
RθJB Junction-to-board thermal resistance 14.7 °C/W
ψJT Junction-to-top characterization parameter 1.2 °C/W
ψJB Junction-to-board characterization parameter 14.7 °C/W
(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report, SPRA953.

7.5 Electrical Characteristics

The electrical ratings specified in this section apply to all specifications in this document, unless otherwise noted. These specifications are interpreted as conditions that do not degrade the device parametric or functional specifications for the life of the product containing it. TJ = –40°C to 125°C, VVIN = 4.5 V to 28 V, (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
INPUT SUPPLY
VVIN Input voltage range 4.5 28 V
IOFF Shutdown current PWM = GND 2 8.6 µA
VVIN_UVLO VIN undervoltage lockout Rising VVIN 3.83 4.2 4.47 V
Falling VVIN 3.4 3.7 3.95
Hysteresis 470 mV
DIMMING (PWM PIN)
VADIM Analog dimming-mode threshold Rising VPWM 1.97 2.07 2.17 V
Falling VPWM 1.8
VPDIM PWM dimming-mode threshold Rising VPWM 0.9 1 1.1 V
Falling VPWM 0.8
VPWM Threshold to identify PWM duty cycle Rising VPWM 0.91 1 1.12 V
Falling VPWM 0.5 0.63 0.72
VPWM_SHUTDOWN Shutdown threshold 0.35 0.55 V
FEEDBACK AND ERROR AMPLIFIER
VFB1 Feedback voltage in analog dimming mode PWM = 3.3 V, SW duty cycle > 90% 201 205 210 mV
VFB2 Feedback voltage in PWM dimming mode PWM = 1.5 V, SW duty cycle > 90% 96 100 104 mV
BOOT PIN
VBOOT_UVLO BOOT-SW UVLO threshold Rising 2.1 2.33 V
Falling 2 2.2
POWER STAGE
RHSD High-side FET on-resistance VBOOT – VSW= 6 V 150 259 mΩ
RLSD Low-side FET on-resistance VVIN > 6 V 70 120 mΩ
CURRENT LIMIT
ILIM_HS1 High-side current limit 1 Either one of the following conditions:
1. PWM dimming mode
2. Analog dimming mode and PWM duty cycle >25% 		2.4 3 3.6 A
ILIM_HS2 High-side current limit 2 Analog dimming mode and PWM duty cycle <25% 1 1.4 1.8 A
ILIM_LS_SOURCE Low-side source current limit VVIN > 6 V 2.3 3.3 4.4 A
ILIM_LS_SINK Low-side sink current limit VVIN > 6 V 1.25 1.7 2.2 A
FAULT PROTECTION
Thermal shutdown(1) Rising temperature 150 160 170 °C
Hysteresis 10 °C
VOVP Overvoltage protection 1 V
VOCP Overcurrent protection 120%
(1) Not production tested

7.6 Timing Requirements

MIN TYP MAX UNIT
THERMAL SHUTDOWN
tHIC_THERMAL TPS54200 and TPS54201 thermal shutdown auto-retry time 32 768 Cycles
OVERVOLTAGE PROTECTION
tHIC_OV TPS54201 auto-retry time for overvoltage protection 32 768 Cycles
OVERCURRENT AND OPEN-LOOP PROTECTION
tSHUTDOWN_DELAY TPS54200 shutdown delay time for open-loop and overcurrent protection 512 Cycles
tHIC_WAIT TPS54201 auto-retry wait time for open-loop and overcurrent protection 512 Cycles
tHIC_OC TPS54201 auto-retry time for open-loop and overcurrent protection 16 384 Cycles
SOFT START
tSS Internal soft-start time 0.6 ms

7.7 Switching Characteristics

TJ = –40°C to 125°C, VVIN = 4.5 V to 28 V, (unless otherwise noted).
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
OSCILLATOR
fsw Switching frequency 480 600 700 kHz
ON-TIME CONTROL
tMIN_ON Minimum on-time Measured at 90% to 90% and 1-A loading 90 105 ns

7.8 Typical Characteristics

VVIN = 12 V, unless otherwise specified
TPS54200 TPS54201 D001_SLUSCO8.gif
Figure 1. Shutdown Quiescent Current vs Junction Temperature
TPS54200 TPS54201 D003_SLUSCO8.gif
Figure 3. Low-Side FET On-Resistance vs Junction Temperature
TPS54200 TPS54201 D005_SLUSCO8.gif
Figure 5. FB Voltage in PDIM vs Junction Temperature
TPS54200 TPS54201 D007_SLUSCO8.gif
Figure 7. High-Side Source Current Limit 1 Threshold vs Junction Temperature
TPS54200 TPS54201 D009_SLUSCO8.gif
Figure 9. Low-Side Source Current Limit Threshold vs Junction Temperature
TPS54200 TPS54201 D011_SLUSCO8.gif
Figure 11. BOOT-SW UVLO Threshold vs Junction Temperature
TPS54200 TPS54201 D013_SLUSCO8.gif
Figure 13. Analog Dimming Mode Threshold vs Junction Temperature
TPS54200 TPS54201 D015_SLUSCO8.gif
Figure 15. PWM Shutdown Threshold vs Junction Temperature
TPS54200 TPS54201 D002_SLUSCO8.gif
Figure 2. High-Side FET On-Resistance vs Junction Temperature
TPS54200 TPS54201 D004_SLUSCO8.gif
Figure 4. FB Voltage in ADIM vs Junction Temperature
TPS54200 TPS54201 D006_SLUSCO8.gif
Figure 6. Switching Frequency vs Junction Temperature
TPS54200 TPS54201 D008_SLUSCO8.gif
Figure 8. High-Side Source Current Limit 2 Threshold vs Junction Temperature
TPS54200 TPS54201 D010_SLUSCO8.gif
Figure 10. Low-Side Sink Current Limit Threshold vs Junction Temperature
TPS54200 TPS54201 D012_SLUSCO8.gif
Figure 12. VIN UVLO Threshold vs Junction Temperature
TPS54200 TPS54201 D014_SLUSCO8.gif
Figure 14. PWM Dimming Mode Threshold vs Junction Temperature

8 Detailed Description

8.1 Overview

The TPS5420x device is a 1.5-A synchronous buck LED driver up to 28-V input. Current-mode operation provides fast transient response. The optimized internal compensation network minimizes the external component count and simplifies the control loop design.

The TPS5420x device has a fixed 600-kHz switching frequency for a good tradeoff between efficiency and size.

The integrated 150-mΩ high-side MOSFET and 70-mΩ low-side MOSFET allow for a high-efficiency LED driver with continuous output current up to 1.5 A.

The TPS5420x device supports deep dimming in both analog and PWM dimming modes. In analog dimming mode, the internal reference voltage is changed in proportion to the duty cycle of the PWM signal in the 1% to 100% range. In the PWM dimming mode, the LED turns on and off periodically according to the PWM duty cycle. For higher efficiency, the internal reference is halved to 100 mV.

Cycle-by-cycle current limit in the high-side MOSFET protects the converter in overload conditions and is enhanced by a low-side MOSFET freewheeling current limit which prevents current runaway. There is a low-side MOSFET sinking-current limit to prevent excessive reverse current.

For safety and protection, the TPS5420x includes LED-open and -short protection, sense-resistor-open and -short protection, and device thermal protection. The TPS54200 device implements shutdown-and-latch mode protection, whereas the TPS54201 device implements auto-retry mode protection.

8.2 Functional Block Diagram

TPS54200 TPS54201 block_lusco8.gif

8.3 Feature Description

8.3.1 Fixed-Frequency PWM Control

The device uses a fixed-frequency and peak-current-mode control. The LED current is sensed by a resistor in series with the LED string. The sensed voltage is fed to the FB pin through an RC filter, and then compared to an internal voltage reference by an error amplifier. An internal oscillator initiates the turnon of the high-side power switch. The error amplifier output is compared to the current of the high-side power switch. When the power-switch current reaches the error-amplifier output-voltage level, the high-side power switch is turned off and the low-side power switch is turned on. Thus, the error amplifier output voltage regulates inductor peak current, and in turn the LED current, to a target value. The device implements a current limit by clamping the error amplifier voltage to a maximum level and also implements a minimum clamp for improved transient-response performance.

8.3.2 Error Amplifier

The device has a transconductance amplifier as the error amplifier. The error amplifier compares the FB voltage to the lower of the internal soft-start voltage or the internal voltage reference. The transconductance of the error amplifier is 240 μA/V typically. The frequency compensation components are placed internally between the output of the error amplifier and ground.

8.3.3 Slope Compensation and Output Current

The device adds a compensating ramp to the signal of the switch current. This slope compensation prevents subharmonic oscillations as the duty cycle increases. The available peak inductor current remains constant over the full duty-cycle range.

8.3.4 Input Undervoltage Lockout

The device implements internal undervoltage-lockout (UVLO) circuitry on the VIN pin. The device is disabled when the VIN pin voltage falls below the internal VIN UVLO threshold, which is 3.7 V typical. The internal VIN UVLO threshold has a hysteresis of 470 mV.

 
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