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LM3432 데이터시트(PDF) 11 Page - Texas Instruments |
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LM3432 데이터시트(HTML) 11 Page - Texas Instruments |
11 / 27 page VDIM IOUT1 IOUT2 IOUT3 IOUT4 IOUT5 IOUT6 TON TOFF 0.5 Ps 1.0 Ps 1.5 Ps 2.0 Ps 2.5 Ps 3.0 Ps Time T = TON + TOFF LM3432, LM3432B www.ti.com SNVS498D – APRIL 2007 – REVISED MAY 2013 Figure 15. PWM Dimming Switching Timing LED SHORT FAULT DETECT With DHC If the Dynamic Headroom Control (DHC) feature is used, the lowest voltage between the IOUT pins and ground among the strings will be regulated to 0.625V typical (ILED = 20 mA) by lowering the LED supply rail voltage, VLED. If an LED short fault condition occurs and causes the voltage between any of the IOUT pins and ground to exceed the typical short fault threshold of 7.9V for more than 150 µs, the affected channel(s) will be latched off and the FAULTb pin will be pulled to ground. The affected channel(s) will remain latched off until recycling power or toggling the EN pin. All of the other channels that are not affected will continue to function normally. Without DHC In applications where the DHC function is not used, the IOUT pin voltage on each string will be the voltage difference between the LED supply rail voltage, VLED, and the voltage drop across the entire LED string. If the voltage between any of the IOUT pins and ground is less than 2V typical, the short fault detect feature will be active for all channels. In the event an LED short fault condition occurs and causes the voltage between any of the IOUT pin and ground to exceed the typical short fault threshold of 7.9V for more than 150 μs, the affected channel(s) will be latched off and the FAULTb pin will be pulled to ground. The affected channel(s) will remain latched off until recycling power or toggling the EN pin. All of the other channels that are not affected will continue to function normally. If the voltages between all IOUT pins and ground are greater than 2V typical, the Short Fault Detect feature will be disabled to prevent false triggering of the short fault detect function. Copyright © 2007–2013, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3432 LM3432B |
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