TPS61196 6-String 400-mA WLED Driver with Independent PWM Dimming for Each String |

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6-String 400-mA WLED Driver with Independent PWM Dimming for Each String



The TPS61196 provides a highly integrated solution for LCD TV backlight with an independent PWM dimming function for each string. This device is a current mode boost controller driving up to six WLED strings with multiple LEDs in series. Each string has an independent current regulator providing a LED current adjustable from 50 mA to 400 mA within ±1.5% matching accuracy. The minimal voltage at the current sink is programmable in the range of 0.3 V to 1 V to fit with different LED current settings. The input voltage range for the device is from 8 V to 30 V.

The device adjusts the boost controller'’s output voltage automatically to provide only the voltage required by the LED string with the largest forward voltage drop plus the minimum required voltage at that string's IFB pin, thereby optimizing driver efficiency. Its switching frequency is programmed by an external resistor from 100 kHz to 800 kHz.

The TPS61196 supports direct PWM brightness dimming. Each string has an independent PWM control input. During the PWM dimming, the LED current is turned on or turned off at the frequency and duty cycle which are determined by the external PWM signal. The PWM frequency ranges from 90 Hz to 22 kHz.

The device integrates overcurrent protection, output short-circuit protection, ISET short-to-ground protection, diode open and short protection, LED open and short protection, and overtemperature shutdown circuit. In addition, the TPS61196 can detect the IFB pin short to ground to protect the LED string. The device also provides programmable input undervoltage lockout threshold and output overvoltage protection threshold.

The TPS61196 has a built-in linear regulator which steps down the input voltage to the VDD voltage for powering the internal circuitry. An soft-start circuit is implemented internally to work with an external capacitor to adjust the soft start-up time to minimize the in-rush current during boost converter start-up. The device is available in a 28-pin HTSSOP package with PowerPAD.


  • 8-V to 30-V Input Voltage
  • Up to 120-V Output Voltage
  • 100-KHz to 800-kHz Programmable Switching
  • Adaptive Boost Output for LED Voltages
  • Six Current Sinks, 200-mA Continuous Output,
    400-mA Pulse Output for Each String
  • ±1.5% Current Matching Between Strings
  • High Precision PWM Dimming Resolution up to
  • Programmable Overvoltage Threshold at Output
    and Each Current Sink
  • Programmable Undervoltage Threshold at Input
    with Adjustable Hysteresis
  • Adjustable Soft Start Time Independent of
    Dimming Duty Cycle
  • Built-in LED Open and LED Short Protection
  • Built-in Schottky Diode Open/Short Protection
  • Built-in ISET Short Protection
  • Built-in IFB Short Protection
  • Thermal Shutdown


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Part number Order Channels (#) Vin (Min) (V) Vin (Max) (V) Vout (Min) (V) Vout (Max) (V) Switching frequency (Max) (kHz) Type LED current per channel (mA) LED (#) Topology Shutdown current (Typ) (uA) Peak efficiency (%) LED configuration Features Operating temperature range (C) Package Group Package size: mm2:W x L (PKG)
TPS61196 Order now 6     8     30     8     120     800     Inductive     200     120     Boost     25     96     Series     OVP     -40 to 85     HTSSOP | 28     28HTSSOP: 43 mm2: 4.4 x 9.7 (HTSSOP | 28)    
LP8860-Q1 Order now 4     3     48     2     48     2200     Inductive     150     32     Boost Controller     1     92       Adjustable Switch Frequency
Boost Sync
Fault Diagnostic
Hybrid Dimming/Phase Shift
I2C Control
Spread Spectrum    
-40 to 125     HLQFP | 32     32HLQFP: 81 mm2: 9 x 9 (HLQFP | 32)    
TPS61165 Order now 1     3     18     3     38     1200     Inductive     400     27     Boost     1     90     Parallel
EasyScale 1-Wire Interface
Load Disconnect During Shutdown    
-40 to 85     SOT-23 | 6
WSON | 6    
6SOT-23: 5 mm2: 1.6 x 2.9 (SOT-23 | 6)
6WSON: 4 mm2: 2 x 2 (WSON | 6)    
TPS61193 Order now 3     4.5     40     6     45     2200     Inductive     100     36     Boost     4.5     92     Parallel
Adjustable Switch Frequency
Integrated Switch
PWM Control    
-40 to 85     HTSSOP | 20     20HTSSOP: 42 mm2: 6.4 x 6.5 (HTSSOP | 20)    
TPS61194 Order now 4     4.5     40     6     45     2200     Inductive     100     48     Boost     4.5     92     Parallel
Adjustable Switch Frequency
Integrated Switch
PWM Control