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TPS61197 Datasheet(PDF) 1 Page - Texas Instruments |
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TPS61197 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 22 page D1 IDRV ISNS VIN VDD AGND TPS61197 GDRV FSW VIN = 24V OVP R3 EN R10 R6 C6 C5 PGND COMP R5 UVLO FAULT C3 1.0uF R7 REF R1 R2 22uF C7 C2 2.2uF 300k 2.2uF PWM IFB 50k 22nF C4 R4 Q1 1nF C1 10nF R8 3 0.1 220pF 300 1.0M 20k EC2 EC1 470uF 383k 24.9k 1.0 R9 L1 68uH R11 100 C8 Q2 R12 1.0k 1.0nF TPS61197 www.ti.com SLVSC25 – JULY 2013 Single-String WLED Driver for LCD TV Check for Samples: TPS61197 1 FEATURES • Adjustable Soft Start Time Independent of Dimming Duty Cycle • 8V to 30V Input Voltage • Built-in LED Open Protection • 50 kHz to 800 kHz Programmable Switching • Built-in Schottky Diode Open/Short Protection Frequency • Built-in IFB Short Protection • Adaptive Boost Output to White LED Voltage • Thermal Shutdown • High Precision PWM Dimming Resolution up to 5000:1 • 16L SOIC Package • Programmable Over-voltage Protection APPLICATIONS Threshold at Output • Programmable Under-voltage Threshold at • LCD TV Backlight Input with Adjustable Hysteresis DESCRIPTION The TPS61197 provides highly integrated solutions for LCD TV backlight. This device is a current mode boost controller driving one WLED string with multiple LEDs in series. The input voltage range for TPS61197 is from 8V to 30V.The TPS61197 adjusts the boost controller’s output voltage automatically to provide only the minimum voltage required by the LED string to generate the setting LED current, thereby optimizing the driver’s efficiency. Its switching frequency is programmed by an external resistor from 50 kHz to 800 kHz. The TPS61197 supports direct PWM brightness dimming method. During the 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 over-current protection, output short circuit protection, Schottky diode open and short protection, LED open protection, LED string short protection and over temperature shutdown circuit. The device also provides programmable input under-voltage lockout threshold and output over-voltage protection threshold. The TPS61197 has a built-in linear regulator which steps down the input voltage to the VDD voltage for powering the internal circuitry. An internal soft start circuit is implemented to work with an external capacitor to adjust the soft startup time to minimize the in-rush current during boost converter startup. The device is available in 16-pin SOIC package, which is ideal for a single-layer PCB board. SIMPLIFIED SCHEMATIC CIRCUIT Figure 1. Typical Application of TPS61197 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. PRODUCTION DATA information is current as of publication date. Copyright © 2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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