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TPS61150DRCR Fiches technique(PDF) 8 Page - Texas Instruments |
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TPS61150DRCR Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 26 page IOUT + 0.33 V Current Sink Current Sink ISET1 ISET2 IFB1 IFB2 SEL2 SEL1 12-MHz Current Mode Control PWM VIN GND SW Error Amplifier TPS61150/51 TPS61150, TPS61151 SLVS625E – FEBRUARY 2006 – REVISED NOVEMBER 2015 www.ti.com 8 Detailed Description 8.1 Overview The TPS6115x is a two-channel WLED driver with an integrated inductive boost converter. The boost converter generates the bias voltage for the LED string while the two integrated low-side current sinks independently regulate the current in LED strings from VIN to 29 V. Independent LED string dimming is provided via a PWM input at the SEL1 and SEL2 inputs. 8.2 Functional Block Diagram 8.3 Feature Description 8.3.1 Start-Up During start-up, both the boost converter and the current sink circuitry ramp up simultaneously to establish a steady state. The current sink circuitry ramps up current in 16 steps with each step taking 64 clock cycles. This period ensures that the current sink loop is slower than the boost converter response during start-up. Therefore, the boost converter output comes up slowly as current sink circuitry ramps up the current. This configuration ensures a smooth start-up and minimizes in-rush current. 8.3.2 Overvoltage Protection (OVP) To prevent the boost output runaway as the result of WLED disconnection, there is an overvoltage protection circuit that stops the boost converter from switching as soon as its output exceeds the OVP threshold. When the voltage falls below the OVP threshold, the converter resumes switching. The two OVP options offer the choices to prevent a 25-V rated output capacitor or the internal 30-V FET from breaking down. 8 Submit Documentation Feedback Copyright © 2006–2015, Texas Instruments Incorporated Product Folder Links: TPS61150 TPS61151 |
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