TPS61197 Series

Single-String WLED Driver for LCD TV

Catalog

Single-String WLED Driver for LCD TV

Part	Type	Voltage - Supply (Max)	Internal Switch(s)	Voltage - Output [Min]	Voltage - Output [Max]	Frequency	Mounting Type	Applications	Number of Outputs	Package / Case	Package / Case [x]	Package / Case [y]	Dimming	Topology	Voltage - Supply (Min) [Min]	Operating Temperature [Max]	Operating Temperature [Min]	Supplier Device Package
Texas Instruments TPS61197DR	DC DC Controller	30 V		8 V	300 V	200 kHz	Surface Mount	Backlight	1	16-SOIC	0.154 in	3.9 mm	PWM	Step-Up (Boost)	8 V	85 °C	-40 °C	16-SOIC

Catalog

Single-String WLED Driver for LCD TV

Key Features

• 8-V to 30-V Input Voltage50-kHz to 800-kHz Programmable Switching FrequencyAdaptive Boost Output to White-LED VoltageHigh-Precision PWM Dimming Resolution up to 5000:1Programmable Overvoltage Protection Threshold at OutputProgrammable Undervoltage Threshold at Input with Adjustable HysteresisAdjustable Soft-Start Time Independent of Dimming Duty CycleBuilt-in LED Open and IFB Short ProtectionsBuilt-in Schottky Diode Open/Short ProtectionThermal Shutdown8-V to 30-V Input Voltage50-kHz to 800-kHz Programmable Switching FrequencyAdaptive Boost Output to White-LED VoltageHigh-Precision PWM Dimming Resolution up to 5000:1Programmable Overvoltage Protection Threshold at OutputProgrammable Undervoltage Threshold at Input with Adjustable HysteresisAdjustable Soft-Start Time Independent of Dimming Duty CycleBuilt-in LED Open and IFB Short ProtectionsBuilt-in Schottky Diode Open/Short ProtectionThermal Shutdown

Description

The TPS61197 provides highly integrated solutions for LCD TV backlighting. This device is a current-mode boost controller driving one WLED string with multiple LEDs in series. The TPS61197 adjusts the output voltage of the boost controller automatically to provide only the minimum voltage required by the LED string to generate the setting LED current, thereby optimizing the efficiency of the driver. The device supports direct PWM brightness dimming method. During the pulse-width modulation (PWM) dimming, the white LED current is turned on and off at the duty cycle and frequency, which are determined by an external PWM signal. The PWM dimming frequency ranges from 90 Hz to 22 kHz. The TPS61197 integrates overcurrent protection, output short-circuit protection, Schottky diode open and short protection, LED open protection, LED-string short protection, and overtemperature shutdown circuit. The device also provides programmable input undervoltage lockout (UVLO) threshold and output overvoltage protection (OVP) threshold. The device is available in a 16-pin SOIC package, which is ideal for a single-layer PCB board. The TPS61197 provides highly integrated solutions for LCD TV backlighting. This device is a current-mode boost controller driving one WLED string with multiple LEDs in series. The TPS61197 adjusts the output voltage of the boost controller automatically to provide only the minimum voltage required by the LED string to generate the setting LED current, thereby optimizing the efficiency of the driver. The device supports direct PWM brightness dimming method. During the pulse-width modulation (PWM) dimming, the white LED current is turned on and off at the duty cycle and frequency, which are determined by an external PWM signal. The PWM dimming frequency ranges from 90 Hz to 22 kHz. The TPS61197 integrates overcurrent protection, output short-circuit protection, Schottky diode open and short protection, LED open protection, LED-string short protection, and overtemperature shutdown circuit. The device also provides programmable input undervoltage lockout (UVLO) threshold and output overvoltage protection (OVP) threshold. The device is available in a 16-pin SOIC package, which is ideal for a single-layer PCB board.