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LC1126L-AG6-R Folha de dados(PDF) 5 Page - Unisonic Technologies

Nome de Peças LC1126L-AG6-R
Descrição Electrónicos  ULTRA LOW OUTPUT VOLTAGE LINEAR N-FET CONTROLLER
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Fabricante Electrônico  UTC [Unisonic Technologies]
Página de início  http://www.utc-ic.com
Logo UTC - Unisonic Technologies

LC1126L-AG6-R Folha de dados(HTML) 5 Page - Unisonic Technologies

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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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