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SP6121 Datasheet(PDF) 26 Page - Sipex Corporation

Part # SP6121
Description  Low Voltage, Synchronous Step Down PWM Controller
PDF  42 Pages
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Manufacturer  SIPEX [Sipex Corporation]
Direct Link  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP6121 Datasheet(HTML) 26 Page - Sipex Corporation

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Nov 28 06 AppNote: SP6121 as a Synchronous Buck-Boost LED Driver
© 2006 Sipex Corporation
Page 6
Circuit Performance
Start up
In order to soft-start the converter, use a 1µF capacitor between the COMP pin
and GND. The COMP pin is actually the internal output of the error amplifier. This
high capacitance value will act as a local integrator, slowing down any fast
variation due to start up or transients.
Start up VIN=5.0V
Start up VIN=3.3V
LED Efficiency vs Output Load
50
60
70
80
90
100
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
4.8
5.0
Output Load (mA)
Iout=1.0A
Iout=1.5A
VIN
VOUT
VSENSE
IIN
1A/div
VIN
VOUT
VSENSE
IIN
1A/div



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