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LeadAcidCharger and LED Driver using TPS5402(使用TPS5402 LeadAcidCharger和领导的司机)
Application Report
SLVA595A– May 2013– Revised June 2013
Lead-Acid Charger and LED Driver using TPS5402
Aditya Ambardar
ABSTRACT
The TPS5402 device is a non-synchronous buck regulator with a wide operating range from 3.5 to 28 V.
The switching frequency of the converters can be set from 50 kHz to 1.1 MHz with an external resistor.
Frequency-spread spectrum operation is introduced for EMI reduction. TPS5402 supports pulse-skipping
mode to enhance the efficiency at light load, making this device an ideal pick for applications where
efficiencies at full load and light loads are a key concern.
This application note focuses on applications beyond the fixed voltage operation of the device, with
modification on the standard EVM board available for the part.
Two applications are demonstrated using the TPS5402 device:
1. Lead-acid battery charger
2. LED driver
Design is focused on simple methods to convert a constant voltage supply to constant current supply
using the TPS5402.
Contents
1 Lead-Acid Battery Charger 2
1.1 Modifications to the EVM: Feedback Loop 2
1.2 Constant Current – Constant Voltage Charger 4
1.3 Results 6
2 LED Driver Design 7
2.1 Feedback Section 7
2.2 Results 8
3 Conclusion 8
4 References 8
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