SC4812 View Datasheet(PDF) - Semtech Corporation
Part Name
Description
Manufacturer
SC4812 Datasheet PDF : 15 Pages
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SC4812
POWER MANAGEMENT
Electrical Characteristics
Unless specified: VCC = 12V, a 10uF capacitor connects VCC to GND, VCS = 0, VIN = 48V, a 0.1uF capacitor connects SS/SHDN to GND, OUT = open
circuit, FB = GND, TA = TJ = -40 to +125ºC. Typical values are at TA = 25ºC
Parameter
Test Conditions
Min
Typ
Max
Unit
Startup/Winding Regulator
VIN Input Voltage Range
VIN Supply Current
12
90
V
VIN = 90V, VCC open, driver switching
5
7.5
mA
VIN = 90V, VCC open, VFB = 3V,
driver not switching
3.5
5
mA
VIN Supply Current after Startup
VIN = 90V
50
100
µA
VIN Shutdown Current
VIN = 90V, VSS/SHDN = 0
250
380
µA
VCC Output Voltage
Power from VIN
6.8
7.4
8
V
VCC Current Limit
10% below no load VCC output voltage
12
20
mA
VCC Supply
VCC Turn-on Voltage
Hysteresis
6
6.5
6.7
V
0.8
1
1.4
V
Operating Current
VCC Zener Shunt Voltage
Error Amplifier
ICC = 10mA
3
7.5
mA
15.25
16.25
17.25
V
Feedback Input Voltage
close loop
2.44
2.50
2.56
V
Feedback Input Voltage Regulation
Input Bias Current
VCC = 8V to 14V
2.425
2.575
V
0.5
0.8
µA
Amplifier Transconductance
1000
µmho
Amplifier Source Current
Amplifier Sink Current
Open Loop Voltage Gain
PWM Comparator
Slope Compensation
Oscillator
Clock Frequency Range
Max Duty Cycle
110
µA
110
µA
60
dB
28
mV/µS
235
260
285
kHz
75
80
85
%
2007 Semtech Corp.
3
www.semtech.com
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