絶縁トランス用のプッシュプル・ドライバ
プログラマブル電流制限機能を備えた 0.5A スイッチ
SN6507 は、小さいソリューション・サイズで絶縁電源を実現する高電圧、高周波プッシュプル・トランス・ドライバです。このデバイスは、簡単、低 EMI、磁束キャンセルによるトランスの飽和防止というプッシュプル・トポロジの利点を備えています。デューティ・サイクル制御 (広い入力範囲にかかわらず部品数を低減) と高いスイッチング周波数の選択 (トランスを小型化可能) により、さらにスペースを節約できます。
このデバイスは、コントローラと、スイッチングする位相が異なる 2 つの 0.5A NMOS パワー・スイッチとを内蔵しています。本デバイスの入力動作範囲は、高精度の低電圧誤動作防止によってプログラムされます。本デバイスは、過電流保護 (OCP)、調整可能な低電圧誤動作防止 (UVLO)、過電圧誤動作防止 (OVLO)、サーマル・シャットダウン (TSD)、ブレイク・ビフォー・メイク回路によりフォルト状態から保護されます。
プログラマブル・ソフトスタート (SS) は突入電流を最小限に抑え、厳しい起動要件を満たす電源シーケンスを実現します。スペクトラム拡散クロック (SSC) と、ピンで設定可能なスケーラブル・スルーレート制御 (SRC) は、超低 EMI 要件に対応して伝導および放射によるノイズをさらに低減します。
SN6507 は、10 ピン HVSSOP DGQ パッケージで供給されます。このデバイスは、–55℃~125℃の温度範囲で動作が規定されています。
部品番号 | パッケージ(1) | 本体サイズ (公称) |
---|---|---|
SN6507 | HVSSOP (10 ピン) | 3.00mm × 3.00mm |
Changes from Revision * (March 2022) to Revision A (June 2022)
PIN | DESCRIPTION | ||
---|---|---|---|
NAME | NO. | TYPE(1) | |
SW1 | 1 | O | Open drain output of the first power MOSFET, switch 1. Typically connected to either of the outer terminals of the center tap transformer. Because large currents flow through these pins, their external traces should be kept short. |
GND | 2 | GND | Ground connection of internal control circuits and power MOSFET. Pin 2 and Pin 9 must be shorted on PCB for optimzed emissions and efficiency. |
VCC | 3 | P | The VCC pin is the main supply pin for the power and analog circuits. Short duration, high-current pulses are produced during the turn on and turn off of the power switches. |
EN/UVLO | 4 | I | Enable input and undervoltage lockout (UVLO) programming pin.
|
DC | 5 | I | Duty cycle control pin to compensate input variation. A resistor on this pin to GND sets the duty cycle. If unused, leave the pin floating, the duty cycle is set to the default value (48%). Duty cyle control is disabled in SYNC mode. |
SR | 6 | I | Slew rate control pin to further optimize emission performance. This pin adjusts slew rate of SW1 and SW2 by connecting a resistor to GND. If the pin is left floating, the part switches at the default slew rate. |
CLK | 7 | I | This pin is used to sync the device with an external clock (SYNC mode) or program the switching frequency by connecting the pin to ground through a resistor. If shorted to GND, the part will switch at its default frequency (1MHz typical). If left floating, the part will stop switching. |
SS/ILIM | 8 | I | Multifunction Soft-Start (SS) and Current-Limit (ILIM) input pin.
|
GND | 9 | GND | Ground connection of internal control circuits and power MOSFET. Pin 2 and Pin 9 must be shorted on PCB for optimized emissions and efficiency. |
SW2 | 10 | O | Open drain output of the second power MOSFET, switch 2. Typically connected to either of the outer terminals of the center tap transformer. Because large currents flow through these pins, their external traces should be kept short. |
PowerPAD | 11 | GND | GND pins (Pin 2 and Pin 9) must be electrically connected to the power pad (Pin 11) on the printed circuit board for proper operation. |
MIN | MAX | UNIT | ||
---|---|---|---|---|
Supply voltage (2) | VCC | –0.5 | 60 | V |
Voltage | EN/UVLO | –0.5 | VCC + 0.5 | V |
Voltage | SS/ILIM, CLK, DC | –0.5 | 6 | V |
Output switch voltage | SW1, SW2 | 85 | V | |
Peak output switch current | I(D1)Pk, I(D2)Pk | 1.6 | A | |
Junction temperature, TJ | -55 | 150 | °C | |
Storage temperature range, Tstg | –65 | 150 | °C |
VALUE | UNIT | |||
---|---|---|---|---|
V(ESD) | Electrostatic discharge | Human body model (HBM), per ANSI/ESDA/JEDEC JS-001(1) | ±4000 | V |
Charged device model (CDM), per ANSI/ESDA/JEDEC JS-002(2) | ±1500 |
MIN | NOM | MAX | UNIT | ||||
---|---|---|---|---|---|---|---|
VCC | Input Voltage | 3 | 36 | V | |||
ISW1, ISW2 | Output switch current - Primary side | 3 V < VCC < 6 V | 0.4 | A | |||
6 V < VCC < 36 V | 0.5 | ||||||
TA | Ambient temperature | –55 | 125 | °C | |||
TJ | Junction temperature | –55 | 150 | °C | |||
CSS | Soft-start capacitor on SS/ILIM pin | 0.05 | 10 | µF | |||
RILIM | Current limiting resistor on SS/ILIM pin | 18 | 261 | kΩ | |||
RSR | Resistor on SR pin for Slew rate control | 4.8 | 21 | kΩ | |||
RCLK | Resistor on CLK pin for programmable frequency | 4 | 111 | kΩ |
THERMAL METRIC(1) | SN6507 | UNIT | |
---|---|---|---|
DGQ (HVSSOP) | |||
10 PINS | |||
RθJA | Junction-to-ambient thermal resistance | 48.2 | °C/W |
RθJC(top) | Junction-to-case (top) thermal resistance | 61.6 | °C/W |
RθJB | Junction-to-board thermal resistance | 18.4 | °C/W |
ψJT | Junction-to-top characterization parameter | 1.7 | °C/W |
ψJB | Junction-to-board characterization parameter | 18.3 | °C/W |
RθJC(bottom) | Junction-to-case(bottom) thermal resistance | 5.8 | °C/W |
PARAMETER | TEST CONDITIONS | MIN | TYP | MAX | UNIT | |
---|---|---|---|---|---|---|
SUPPLY CURRENT | ||||||
Icc | VIN Supply Current (3 V < VCC < 36V) , not including switch drive currents | VEN/UVLO=2.5 V, RL = 50 Ω | 3 | 4 | mA | |
ISHUTDOWN | VIN shutdown current | VEN/UVLO=0 V, RL = 50 Ω | 0.8 | 2.5 | µA | |
ILKG(SS/ILIM) | Leakage Current on SS/ILIM pin | VEN/UVLO = 0 V, Voltage of SS/ILIM = 5 V | 0.7 | µA | ||
ENABLE AND UVLO | ||||||
VCCUVLO-RISING | VCC Positive-going UVLO threshold | VCC rising , EN/UVLO is shorted to VCC | 2.8 | 2.9 | V | |
VCCUVLO-FALLING | VCC Negative-going UVLO threshold | VCC falling, EN/UVLO is shorted to VCC | 2.5 | 2.67 | V | |
VCCUVLO-HYS | VCC UVLO threshold hysteresis | EN/UVLO is shorted to VCC | 0.1 | 0.12 | V | |
ENUVLO-RISING | EN/UVLO Positive-going UVLO threshold | EN/UVLO rising | 1.4 | 1.5 | 1.6 | V |
ENUVLO-FALLING | EN/UVLO Negative-going UVLO threshold | EN/UVLO falling | 1.25 | 1.35 | 1.45 | V |
ENUVLO-HYS | EN/UVLO UVLO threshold hysteresis | 0.14 | 0.15 | V | ||
POWER STAGE | ||||||
DMM | Average ON time mismatch between SW1 and SW2 | RL = 50 Ω to VCC, Figure 7-3 | 0 | % | ||
R(ON) | Output switch ON resistance | VCC = 24 V, ISW1, ISW2 = 0.5 A | 0.45 | 1 | Ω | |
V(SLEW) | Voltage slew rates on SW1 and SW2 | RL = 50 Ω to VCC, VCC = 12 V; RSR = 9.6 kΩ (Default), Figure 7-3 | 298 | V/µs | ||
V(SLEW) | Voltage slew rates on SW1 and SW2 | RL = 50 Ω to VCC, VCC = 12 V; RSR = 9.6 kΩ (Default), Figure 7-3 | 369 | V/µs | ||
CLK | ||||||
FSW | D1, D2 average switching Frequency (Default) | RL = 50 Ω, RCLK = 0 kΩ, Figure 7-3 | 780 | 1000 | 1296 | kHz |
F(SYNC) | External clock frequency on CLK pin | External clock applied on CLK pin for SYNC mode. SW1/SW2 switches at 1/2 the external CLK frequency | 200 | 4000 | kHz | |
VCLK(High) | CLK pin logic high threshold | 1.6 | 1.8 | V | ||
VCLK(Low) | CLK pin logic low threshold | 1.0 | 1.2 | V | ||
SOFT-START | ||||||
ISS | SS ext capacitor charging current | 275 | µA | |||
CSS Range | SS ext capacitor range | 0.05 | 5 | µF | ||
CURRENT LIMIT | ||||||
ILIM | SW1 and SW2 Current Limit | RLIM = 18.2 kΩ, 5 V < VCC < 36 V | 1.00 | 1.30 | 1.59 | A |
ILIM | SW1 and SW2 Current Limit | RLIM = 30.1 kΩ, 5 V < VCC < 36 V | 0.56 | 0.79 | 1.02 | A |
ILIM | SW1 and SW2 Current Limit | RLIM = 261 kΩ, 5 V < VCC < 36 V | 0.06 | 0.10 | 0.14 | A |
DC CONTROL | ||||||
Dsw1, Dsw2 | Switching Duty Cycle on SW1 and SW2 | DC pin floating (Default), FSW = 300KHz, Figure 7-2 | 48 | % | ||
Dsw1, Dsw2 | Switching Duty Cycle on SW1 and SW2 | External CLK (SYNC mode), FSW = 300KHz, Figure 7-2 | 48 | % | ||
INPUT OVLO | ||||||
VCCOVLO-RISING | Input Over-voltage Lockout Rising Threshold | VCC rising | 36.9 | 38.7 | 40.5 | V |
VCCOVLO-FALLING | Input Over-voltage Lockout Falling Threshold | VCC falling | 36.5 | 38.2 | 40.0 | V |
VCCOVLO-HYS | Input Over-voltage Lockout Hysteresis | VCC hysteresis voltage | 0.47 | 0.57 | V | |
THERMAL SHUT DOWN | ||||||
TSD+ | TSD turn on temperature | TJ rising | 170 | 184 | 198 | °C |
TSD- | TSD turn off temperature | TJ falling | 135 | 147 | 159 | °C |
TSD-HYST | TSD hysteresis | 32 | 37 | 42 | °C |