SLVS957E June   2009  – April 2016 TPS61300 , TPS61301 , TPS61305

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1. 3.1 Simplified Schematic
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
  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 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1  Safety Timer Accuracy
      2. 8.3.2  LED Failure Modes and Overvoltage Protection
      3. 8.3.3  Start-Up Sequence
      4. 8.3.4  Power Good (Flash Ready)
      5. 8.3.5  LED Temperature Monitoring (TPS61305, TPS61305A, TPS61306)
      6. 8.3.6  Hot Die Detector
      7. 8.3.7  NRESET Input: Hardware Enable and Disable
      8. 8.3.8  ENDCL Input: DC Light Hardware Control
      9. 8.3.9  Flashlight Blanking (Tx-MASK)
      10. 8.3.10 Undervoltage Lockout
      11. 8.3.11 Storage Capacitor Active Cell Balancing
      12. 8.3.12 RED Light Privacy Indicator
      13. 8.3.13 White LED Privacy Indicator
      14. 8.3.14 Storage Capacitor, Precharge Voltage Calibration
      15. 8.3.15 Storage Capacitor, Adaptive Precharge Voltage
      16. 8.3.16 Serial Interface Description
    4. 8.4 Device Functional Modes
      1. 8.4.1  Down-Mode in Voltage Regulation Mode
      2. 8.4.2  LED High-Current Regulators, Unused Inputs
      3. 8.4.3  Power-Save Mode Operation, Efficiency
      4. 8.4.4  Mode of Operation: DC Light and Flashlight
      5. 8.4.5  Flash Strobe is Level Sensitive (STT = 0): LED Strobe Follows FLASH_SYNC Input
      6. 8.4.6  Flash Strobe Is Leading Edge Sensitive (STT = 1): One-Shot LED Strobe
      7. 8.4.7  Current Limit Operation
      8. 8.4.8  Hardware Voltage Mode Selection
      9. 8.4.9  Shutdown
      10. 8.4.10 Thermal Shutdown
      11. 8.4.11 F/S-Mode Protocol
      12. 8.4.12 HS-Mode Protocol
      13. 8.4.13 TPS6130xx I2C Update Sequence
    5. 8.5 Register Maps
      1. 8.5.1  Slave Address Byte
      2. 8.5.2  Register Address Byte
      3. 8.5.3  REGISTER1 (TPS61300, TPS61301)
      4. 8.5.4  REGISTER1 (TPS61305, TPS61305A, TPS61306)
      5. 8.5.5  REGISTER2 (TPS61300, TPS61301)
      6. 8.5.6  REGISTER2 (TPS61305, TPS61305A, TPS61306)
      7. 8.5.7  REGISTER3
      8. 8.5.8  REGISTER4
      9. 8.5.9  REGISTER5
      10. 8.5.10 REGISTER6 (TPS61300, TPS61301)
      11. 8.5.11 REGISTER6 (TPS61305, TPS61305A)
      12. 8.5.12 REGISTER7
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 4100-mA Two White High-Power LED Flashlight Featuring Storage Capacitor
        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
          3. 9.2.1.2.3 Output Capacitor
          4. 9.2.1.2.4 NTC Selection (TPS61305, TPS61305A, TPS61306)
          5. 9.2.1.2.5 Checking Loop Stability
        3. 9.2.1.3 Application Curves
      2. 9.2.2 TPS61300 Typical Application
        1. 9.2.2.1 Design Requirement
        2. 9.2.2.2 Application Curves
    3. 9.3 System Examples
      1. 9.3.1 2x 600-mA High-Power White LED Solution Featuring Privacy Indicator
      2. 9.3.2 White LED Flashlight Driver and Audio Amplifier Power Supply Operating Simultaneously
      3. 9.3.3 White LED Flashlight Driver and Audio Amplifier Power Supply Operating Simultaneously
      4. 9.3.4 White LED Flashlight Driver and Audio Amplifier Power Supply Exclusive Operation
      5. 9.3.5 White LED Flashlight Driver and Auxiliary Lighting Zone Power Supply
      6. 9.3.6 TPS61300, Typical Application
      7. 9.3.7 TPS61301, Typical Application
      8. 9.3.8 TPS61305 Typical Application
      9. 9.3.9 TPS61306, Typical Application
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Thermal Considerations
  12. 12Device and Documentation Support
    1. 12.1 Related Links
    2. 12.2 Community Resources
    3. 12.3 Trademarks
    4. 12.4 Electrostatic Discharge Caution
    5. 12.5 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

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発注情報

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality.

9.1 Application Information

The TPS6130xx can drive up to three white LEDs in parallel (400-mA, 800-mA, and 400-mA maximum flash current). The extended high-current mode (HC_SEL) allows up to 1025-mA, 2050-mA, and 1025-mA flash current. The 2-MHz switching frequency allows the use of small and low profile passive components.

9.2 Typical Applications

9.2.1 4100-mA Two White High-Power LED Flashlight Featuring Storage Capacitor

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 storage2_cap_lvs957.gif Figure 72. 4100-mA Two White High-Power LED Flashlight Featuring Storage Capacitor

9.2.1.1 Design Requirements

For this design example, use the parameters listed in Table 21 as the input parameters.

Table 21. TPS61305 Design Requirement

DESIGN PARAMETER EXAMPLE VALUE
Input Voltage Range 2.5 V to 5.5 V
Output Voltage 4.95 V
Operating Freqency 2 MHz

9.2.1.2 Detailed Design Procedure

9.2.1.2.1 Inductor Selection

A boost converter requires two main passive components for storing energy during the conversion. A boost inductor and a storage capacitor at the output are required. The TPS6130xx device integrates a current limit protection circuitry. The valley current of the PMOS rectifier is sensed to limit the maximum current flowing through the synchronous rectifier and the inductor. The valley peak current limit (250 mA, 500 mA, 1250 mA, or 1750 mA) is user selectable through the I2C interface.

To optimize solution size, the TPS6130xx device has been designed to operate with inductance values between a minimum of 1.3 μH and maximum of 2.9 μH. TI recommends a 2.2-μH inductance in typical high current white LED applications.

The highest peak current through the inductor and the power switch depends on the output load, the input and output voltages. Estimation of the maximum average inductor current and the maximum inductor peak current can be done using Equation 2 and Equation 3:

Equation 2. TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 eq2_ll_lvs957.gif
Equation 3. TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 eq3_llp_lvs957.gif

where

  • f = switching frequency (2 MHz)
  • L = inductance value (2.2 μH)
  • η = estimated efficiency (85%)

The losses in the inductor caused by magnetic hysteresis losses and copper losses are a major parameter for total circuit efficiency.

9.2.1.2.2 Input Capacitor

TI recommends low ESR ceramic capacitors for good input voltage filtering. TI recommends a 10-μF input capacitor to improve transient behavior of the regulator and EMI behavior of the total power supply circuit. The input capacitor must be placed as close as possible to the input pin of the converter.

9.2.1.2.3 Output Capacitor

The major parameter necessary to define the output capacitor is the maximum allowed output voltage ripple of the converter. This ripple is determined by two parameters of the capacitor, the capacitance and the ESR. It is possible to calculate the minimum capacitance needed for the defined ripple, supposing that the ESR is zero, by using Equation 4:

Equation 4. TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 eq4_cmin_lvs957.gif

where

  • f is the switching frequency and ΔV is the maximum allowed ripple

With a chosen ripple voltage of 10 mV, a minimum capacitance of 10 μF is needed. The total ripple is larger due to the ESR of the output capacitor. This additional component of the ripple can be calculated using Equation 5:

Equation 5. ΔVESR = IOUT × RESR

The total ripple is the sum of the ripple caused by the capacitance and the ripple caused by the ESR of the capacitor. Additional ripple is caused by load transients. This means that the output capacitor has to completely supply the load during the charging phase of the inductor. A reasonable value of the output capacitance depends on the speed of the load transients and the load current during the load change.

For the standard current white LED application (HC_SEL = 0, TPS6130xx), a minimum of 3-μF effective output capacitance is usually required when operating with 2.2-μH (typical) inductors. For solution size reasons, this is usually one or more X5R or X7R ceramic capacitors.

Depending on the material, size and therefore margin to the rated voltage of the used output capacitor, degradation on the effective capacitance can be observed. This loss of capacitance is related to the DC bias voltage applied. TI recommends ensuring the selected capacitors are showing enough effective capacitance under real operating conditions.

To support high-current camera flash application (HC_SEL = 1), the converter is designed to work with a low voltage super-capacitor on the output to take advantage of the benefits they offer. A low-voltage super-capacitor in the 0.1-F to 1.5-F range, and with ESR larger than 40 mΩ, is suitable in the TPS6130xx application circuit. For this device the output capacitor must be connected between the VOUT pin and a good ground connection.

9.2.1.2.4 NTC Selection (TPS61305, TPS61305A, TPS61306)

The TPS61305, TPS61305A, and TPS61306 require a negative thermistor (NTC) for sensing the LED temperature. Once the temperature monitoring feature is activated, a regulated bias current (≈24 μA) will be driven out of the TS port and produce a voltage across the thermistor.

If the temperature of the NTC-thermistor rises due to the heat dissipated by the LED, the voltage on the TS input pin decreases. When this voltage goes below the warning threshold, the LEDWARN bit in REGISTER6 is set. This flag is cleared by reading the register.

If the voltage on the TS input decreases further and falls below hot threshold, the LEDHOT bit in REGISTER6 is set and the device goes automatically in shutdown mode to avoid damaging the LED. This status is latched until the LEDHOT flag gets cleared by software.

The selection of the NTC-thermistor value strongly depends on the power dissipated by the LED and all components surrounding the temperature sensor and on the cooling capabilities of each specific application. With a 220-kΩ (at 25°C) thermistor, the valid temperature window is set between 60°C to 90°C. The temperature window can be enlarged by adding external resistors to the TS pin application circuit. To ensure proper triggering of the LEDWARN and LEDHOT flags in noisy environments, the TS signal may require additional filtering capacitance.

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 temp_mon2_lvs957.gif Figure 73. Temperature Monitoring Characteristic

9.2.1.2.5 Checking Loop Stability

The first step of circuit and stability evaluation is to look from a steady-state perspective at the following signals:

  • Switching node, SW
  • Inductor current, IL
  • Output ripple voltage, VOUT(AC)

These are the basic signals that need to be measured when evaluating a switching converter. When the switching waveform shows large duty cycle jitter or the output voltage or inductor current shows oscillations the regulation loop may be unstable. This is often a result of improper board layout or L-C combination.

As a next step in the evaluation of the regulation loop the load transient response needs to be tested. VOUT can be monitored for settling time, overshoot or ringing that helps judge the converter's stability. Without any ringing, the loop has usually more than 45° of phase margin.

Because the damping factor of the circuitry is directly related to several resistive parameters, such as MOSFET rDS(on), that are temperature dependant, the loop stability analysis has to be done over the input voltage range, output current range, and temperature range.

9.2.1.3 Application Curves

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 prechg_nolo_lvs957.gif Figure 74. Storage Capacitor Precharge (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 v_stup_nolo2_lvs957.gif Figure 76. Storage Capacitor Charge-Up (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 dc_lt_op_lvs957.gif Figure 78. DC Light Operation (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 fl_str70_2_lvs957.gif Figure 80. Flash Sequence (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 fl_str35_1_lvs957.gif Figure 82. Flash Sequence (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 die_temp_lvs957.gif Figure 84. Junction Temperature Monitoring (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 v_stup_nolo1_lvs957.gif Figure 75. Storage Capacitor Charge-Up (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 v_setup_nolo3_lvs957.gif Figure 77. Storage Capacitor Charge-Up (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 fl_str70_1_lvs957.gif Figure 79. Flash Sequence (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 fl_str70_3_lvs957.gif Figure 81. Flash Sequence (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 fl_str35_2_lvs957.gif Figure 83. Flash Sequence (HC_SEL = 1)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 hc_sel_nolo_lvs957.gif Figure 85. Shutdown (HC_SEL = 1)

9.2.2 TPS61300 Typical Application

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 pmi_lvs957.gif Figure 86. TPS61300 Typical Application Circuit

9.2.2.1 Design Requirement

For this design example, use the parameters listed in Table 22 as the input parameters.

Table 22. TPS61300 Design Requirement

DESIGN PARAMETER EXAMPLE VALUE
Input Voltage Range 2.5 V to 5.5 V
Output Voltage 4.95 V
Operating Freqency 2 MHz

9.2.2.2 Application Curves

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 flash_seq_lvs957.gif Figure 87. Flash Sequence (HC_SEL = 0)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 tmask_op2_lvs957.gif Figure 89. Tx-Masking Operation (HC_SEL = 0)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 io_dim_op_lvs957.gif Figure 91. Low-Light Dimming Mode Operation
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 pfm_ops_lvs957.gif Figure 93. PFM Operation
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 pfpw_ld_tr_lvs957.gif Figure 95. Voltage Mode Load Transient Response
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 vmode_stup_lvs957.gif Figure 97. Start-Up Into Voltage Mode Operation
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 tmask_op1_lvs957.gif Figure 88. Tx-Masking Operation (HC_SEL = 0)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 tmask_op3_lvs957.gif Figure 90. Tx-Masking Operation (HC_SEL = 0)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 pwm_ops_lvs957.gif Figure 92. PWM Operation
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 dn_mode_op_lvs957.gif Figure 94. Down-Mode Operation (Voltage Mode)
TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 dc_lt_stup_lvs957.gif Figure 96. Start-Up Into DC Light Operation

9.3 System Examples

9.3.1 2x 600-mA High-Power White LED Solution Featuring Privacy Indicator

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 privacy_lvs957.gif Figure 98. 2× 600-mA High-Power White LED Solution Featuring Privacy Indicator

9.3.2 White LED Flashlight Driver and Audio Amplifier Power Supply Operating Simultaneously

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 audio_pwr_lvs957.gif Figure 99. White LED Flashlight Driver and Audio Amplifier Power Supply Operating Simultaneously

9.3.3 White LED Flashlight Driver and Audio Amplifier Power Supply Operating Simultaneously

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 audio2_pwr_lvs957.gif Figure 100. White LED Flashlight Driver and Audio Amplifier Power Supply Operating Simultaneously

9.3.4 White LED Flashlight Driver and Audio Amplifier Power Supply Exclusive Operation

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 audio3_pwr_lvs957.gif Figure 101. White LED Flashlight Driver and Audio Amplifier Power Supply Exclusive Operation

9.3.5 White LED Flashlight Driver and Auxiliary Lighting Zone Power Supply

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 audio4_pwr_lvs957.gif Figure 102. White LED Flashlight Driver and Auxiliary Lighting Zone Power Supply

9.3.6 TPS61300, Typical Application

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 typ_app_300_lvs957.gif Figure 103. TPS61300, Typical Application

9.3.7 TPS61301, Typical Application

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 typ_app_301_lvs957.gif Figure 104. TPS61301, Typical Application

9.3.8 TPS61305 Typical Application

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 typ_app_305_lvs957.gif Figure 105. TPS61305, Typical Application

9.3.9 TPS61306, Typical Application

TPS61300 TPS61301 TPS61305 TPS61305A TPS61306 typ_app_306_lvs957.gif Figure 106. TPS61306, Typical Application