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LC1126 Datasheet(PDF) 5 Page - Unisonic Technologies |
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LC1126 Datasheet(HTML) 5 Page - Unisonic Technologies |
5 / 6 page LC1126 Preliminary LINEAR INTEGRATED CIRCUIT UNISONICTECHNOLOGIESCO.,LTD 5 of 6 www.unisonic.com.tw QW-R102-050.a FUNCTION DESCRIPTIONS Power-On-Reset A Power-On-Reset (POR) circuit monitors the VCC pin voltage (VCC) for power-on-reset function to prevent wrong operation. The built-in POR circuit keeps the output shutting off until internal circuit is operating properly.. Internal Soft-Start An internal soft-start provides an internal soft-start circuitry to control rise rate of the output voltage and limit the current surge during start-up. The typical soft-start interval is about 1ms. Output Voltage Regulation An error amplifier working with a temperature compensated 0.5V reference and an output NMOS regulates output to the preset voltage. The error amplifier designed with high bandwidth and DC gain provides very fast transient response and less load regulation. Under-Voltage Protection (UVP) UTC LC1126 monitors the voltage on FB pin after soft-start process is finished. Therefore the UVP is disabling during soft-start. When the voltage on FB pin falls below the under-voltage threshold, the UVP circuit shuts off the output immediately. After a while (~70% Duty), UTC LC1126 starts a new soft-start to regulate output. Thermal Shutdown A thermal shutdown circuit limits the junction temperature of UTC LC1126. When the junction temperature exceeds +150°C, a thermal sensor turns off the output NMOS, allowing the device to cool down. The regulator regulates the output again through initiation of new soft-start cycle after the junction temperature cools by 50°C, resulting in a pulsed output during continuous thermal overload conditions. TYPICAL APPLICATION CIRCUIT VCC=5V C3 0.1µF U1 VCC 1 2 GND 3 POK UTC LC1126 DRV FB EN 6 5 4 10K 56pF Q1 MOSFET N R1 43K R2 39K C2 10µF 4.7µF C1 VOUT=1.05V VIN=1.5V VOUT=0.5V* (1+ R1 R2 ) C4 |
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