SLVSA85E June   2010  – December 2016 TPS61187

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Typical Characteristics
      1. 6.6.1 Table Of Graphs
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Supply Voltage
      2. 7.3.2 Boost Regulator and Programmable Switch Frequency (FSCLT)
      3. 7.3.3 LED Current Sinks
      4. 7.3.4 Enable and Start-up
      5. 7.3.5 IFB Pin Unused
    4. 7.4 Device Functional Modes
      1. 7.4.1 Brightness Dimming Control
      2. 7.4.2 Adjustable PWM Dimming Frequency and Mode Selection (R_FPWM/MODE)
      3. 7.4.3 Mode Selection - Phase-Shift PWM Or Direct PWM Dimming
        1. 7.4.3.1 Phase-Shift PWM Dimming
        2. 7.4.3.2 Direct PWM Dimming
      4. 7.4.4 Overvoltage Clamp and Voltage Feedback (OVC / FB)
      5. 7.4.5 Current-Sink Open Protection
      6. 7.4.6 Overcurrent and Short-Circuit Protection
      7. 7.4.7 Thermal Protection
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 Inductor Selection
        2. 8.2.2.2 Output Capacitor Selection
        3. 8.2.2.3 Isolation FET Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted) (1)
MIN MAX UNIT
Voltage range(2) VIN, FAULT –0.3 24 V
FPO –0.3 7 V
SW –0.3 40 V
EN, PWM, IFB1 to IFB4 –0.3 20 V
VDDIO –0.3 3.7 V
All other pins –0.3 3.6 V
Continuous power dissipation See Thermal Information
Operating junction temperature range –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, and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
(2) All voltage values are with respect to network ground terminal.

6.2 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
Machine model 200
(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.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)
MIN NOM MAX UNIT
VIN Input voltage 4.5 24 V
VOUT Output voltage VIN 38 V
L1 Inductor, 600-kHz to 1-MHz switching frequency 10 22 µH
L1 Inductor, 300-kHz to 600-kHz switching frequency 22 47 µH
CI Input capacitor 1 µF
CO Output capacitor 1 4.7 10 µF
FPWM_O IFBx PWM dimming frequency - frequency programmable mode 0.1 22(1) KHz
FPWM_O IFBx PWM dimming frequency - direct PWM mode 0.1 50 KHz
FPWM_I PWM input signal frequency 0.1 22 KHz
FBOOST Boost regulator switching frequency 300 1000 KHz
TA Operating free-air temperature –40 85 °C
TJ Operating junction temperature –40 125 °C
(1) 5-µs minimum pulse on time.

6.4 Thermal Information

THERMAL METRIC(1) TPS61187 UNIT
RTJ (WQFN)
20 PINS
RθJA Junction-to-ambient thermal resistance 39.9 °C/W
RθJC(top) Junction-to-case(top) thermal resistance 34.0 °C/W
RθJB Junction-to-board thermal resistance 9.9 °C/W
ψJT Junction-to-top characterization parameter 0.6 °C/W
ψJB Junction-to-board characterization parameter 9.5 °C/W
RθJC(bottom) Junction-to-case(bottom) thermal resistance 2 °C/W
(1) For more information about traditional and new thermal metrics, see Semiconductor and IC Package Thermal Metrics.

6.5 Electrical Characteristics

VIN = 12 V, PWM/EN = high, IFB current = 20 mA, IFB voltage = 500 mV, TA = –40°C to +85°C, typical values are at TA = 25°C (unless otherwise noted)
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
SUPPLY CURRENT
VIN Input voltage range 4.5 24 V
IQ_VIN Operating quiescent current into VIN Device enable, switching 1 MHz and no load,
VIN = 24 V		 4 mA
VDDIO VDDIO pin output voltage ILOAD = 5 mA 3 3.3 3.6 V
ISD Shutdown current VIN = 12 V , EN = low 11 µA
VIN = 24 V, EN = low 16
VIN_UVLO VIN undervoltage lockout threshold VIN ramp down 3.5 V
VIN ramp up 3.75
VIN_Hys VIN undervoltage lockout hysterisis 250 mV
PWM
VH EN logic high threshold EN 2.1 V
VL EN logic low threshold EN 0.8
VH PWM logic high threshold PWM 2.1
VL PWM logic low threshold PWM 0.8
RPD Pulldown resistor on PWM and EN 400 800 1600 kΩ
CURRENT REGULATION
VISET ISET pin voltage 1.204 1.229 1.253 V
KISET Current multiplier 980
IFB Current accuracy IISET = 20 µA, 0°C to 70°C –2% 2%
IISET = 20 µA, –40°C to 85°C –2.3% 2.3%
Km (Imax–Imin) / IAVG IISET = 20 µA 1.3%
Ileak IFB pin leakage current IFB voltage = 15 V, each pin 2 5 µA
IFB voltage = 5 V, each pin 1 2
IIFB_max Current sink max output current IFB = 350 mV 30 mA
fdim PWM dimming frequency RFPWM = 9.09 kΩ 20 kHz
BOOST OUTPUT REGULATION
VIFB_L Output voltage up threshold Measured on VIFB(min) 350 mV
VIFB_H Ouput voltage down threshold Measured on VIFB(min) 650 mV
POWER SWITCH
RPWM_SW PWM FET on-resistance VIN = 12 V 0.25 0.35 Ω
ILN_NFET PWM FET leakage current VSW = 40 V, TA = 25°C 2 µA
OSCILLATOR
fS Oscillator frequency RFSW = 499 kΩ 0.8 1 1.2 MHz
Dmax Maximum duty cycle IFB = 0 94%
OC, SC, OVP, AND SS
ILIM N-channel MOSFET current limit D = Dmax 2 3 A
VCLAMP_TH Ouput voltage clamp program threshold 1.90 1.95 2 V
VOVP_IFB IFB overvoltage threshold Measured on the IFBx pin, IFB on 12 13.5 15 V
FPO, FAULT
VFPO_L FPO Logic low voltage I_SOURCE = 0.5 mA 0.4 V
VFAULT_HIGH Fault high voltage Measured as VIN – VFAULT 0.1 V
VFAULT_LOW Fault low voltage Measured as VIN – VFAULT , Sink, 10 µA 6 8 10 V
IFAULT Maximum sink current VIN – VFAULT = 0 V 20 µA
THERMAL SHUTDOWN
Tshutdown Thermal shutdown threshold 150 °C
Thermal shutdown hysteresis 15

6.6 Typical Characteristics

6.6.1 Table Of Graphs

TITLE DESCRIPTION FIGURE
Dimming linearity VOUT = 32 V, VIN = 8 V, 12 V, 24 V, FDIM = 20 KHz, L = 10 µH, RISET = 62 kΩ Figure 1
Dimming linearity VOUT = 32 V, VIN = 8 V, 12 V, 24 V, FDIM = 200 Hz, L = 10 µH, RISET = 62 kΩ Figure 2
Boost switching frequency VIN = 12 V, VOUT = 33.8 V, L = 10 µH, RISET = 62 kΩ Figure 3
Phase shift dimming frequency VIN = 12 V, VOUT = 33.8 V, L = 10 µH, RISET = 62 kΩ Figure 4
Switch waveform VIN = 8 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 100%, L = 10 µH, RISET = 62 kΩ Figure 5
Switch waveform VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 100%, L = 10 µH, RISET = 62 kΩ Figure 6
Phase shift PWM dimming FDIM = 200Hz, duty = 50% VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 45%, L = 10 µH, RISET = 62 kΩ Figure 7
Phase shift PWM dimming FDIM = 20KHz, duty = 50% VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 51%, L = 10 µH, RISET = 62 kΩ Figure 8
Output ripple of Phase shift PWM dimming VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 50%, L = 10 µH, RISET = 62 kΩ Figure 9
Output ripple of Phase shift PWM dimming VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 70%, L = 10 µH, RISET = 62 kΩ Figure 10
Start-up waveform VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 100%, L = 10 µH, RISET = 62 kΩ Figure 11
Start-up waveform VIN = 12 V, VOUT = 33.8 V, FDIM = 20 kHz, Duty = 50%, L = 10 µH, RISET = 62 kΩ Figure 12
TPS61187 io_dim_lvsa85.gif
Figure 1. Output Current
TPS61187 io2_dim_lvsa85.gif
Figure 2. Output Current
TPS61187 fs_rfslct_lvsa85.gif
Figure 3. Switching Frequency
TPS61187 vi_8v_lvsa85.gif
Figure 5. Switch Waveform
TPS61187 duty_45_lvsa85.gif
Figure 7. Phase-Shift Waveform
TPS61187 duty_50_lvsa85.gif
Figure 9. Output Ripple Waveform
TPS61187 duty_100_lvsa85.gif
Figure 11. Start-Up Waveform
TPS61187 dim_rfpwm_lvsa85.gif
Figure 4. Dimming Frequency
TPS61187 vi_12v_lvsa85.gif
Figure 6. Switch Waveform
TPS61187 duty_51_lvsa85.gif
Figure 8. Phase-Shift Waveform
TPS61187 duty_70_lvsa85.gif
Figure 10. Output Ripple Waveform
TPS61187 duty_570_lvsa85.gif
Figure 12. Start-Up Waveform