SC1402(2001) Просмотр технического описания (PDF) - Semtech Corporation
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SC1402
(Rev.:2001)
(Rev.:2001)
Semtech Corporation
SC1402 Datasheet PDF : 18 Pages
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SC1402
POWER MANAGEMENT
Electrical Characteristics (Cont.)
(Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = VL, VL load = 0mA, REF load = 0mA, PSAVE = 0V, TA =-40 to +85°C.
Typical values are at TA = +25°C).
Parameters
Conditions
MIN TYP MAX
Units
MAIN SMPS CONTROLLERS (Cont.)
Load Regulation
Line Regulation
Either SMPS, 0V < CSL-CSL < 80mV
Either SMPS, 6V < V+ < 30V
-0.8
%
0.03
%/V
Current-Limit Threshold
PSAVE Mode Threshold
Soft-Start Ramp Time (2)
Oscillator Frequency
Maximum Duty Factor
SYNC Input High Pulse Width (2)
CSH3-CSL3 or CSH5-CSL5
PSAVE = VL or V12OUT < 11.9V
PSAVE = 0V, not tested
From enable to 95% full current limit with
respect to fOSC
SYNC = VL
SYNC = 0V
SYNC = VL, 300kHz
SYNC = 0V, 200kHz
80
100 120 mV
-50 -100 -150
10
25
40
mV
512
clks
270 300 330 kHz
170 200 235
90
94
%
92
96
300
SYNC Input Low Pulse Width (2)
SYNC Tise/Fall Time (2)
300
ns
200
SYNC Input Frequency Range
Current-Sense Input Leakage Current
V+ = VL = 0V, CSL3 = CSH3 = CSL5 =
CSH5 = 5.5V
240
350 kHz
0.01 10
µA
FLYBACK CONTROLLER
VDD Shunt Threshold
Rising edge, hysteresis = 1%
18
20
V
VDD Shunt Sink Current
VDD = 20V
5
10
30
mA
VDD Leakage Current
VDD = 5V, Standby mode
30
µA
12V LINEAR REGULATION
12OUT Output Voltage
0mA < Load < 120mA
11.55 12.1 12.50 V
12OUT Current Limit
12OUT forced to 11V, VDD = 13V
150
mA
12OUT Regulation Threshold
Falling edge
11.9
V
Quiescent VDD Current
VDD = 18V, run mode, no 12OUT load
50 100 µA
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
SHDN = V+, 6V < V+ < 30V, 0mA < ILOAD 4.6
< 50mA, RUN/ON3 = TIME/ON = 0V
5.2
V
Undervoltage Fault Lockout Threshold
Falling edge, hysteresis = 0.9V
3.5
3.7 4.0
V
2001 Semtech Corp.
3
www.semtech.com
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