SC1404 Просмотр технического описания (PDF) - Semtech Corporation
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SC1404 Datasheet PDF : 25 Pages
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SC1404
POWER MANAGEMENT
Electrical Characteristics Cont.
Unless otherwise noted: V+ = 15V, both PWMs on, SYNC = 0V, VL load = 0mA, REF load = 0mA, PSAVE# = 0V, TA =-40 to 85°C.
Typical values are at TA = +25°C. Circuit = Typical Application Circuit
PARAMETER
CONDITIONS
MIN TYP MAX
Current-Limit Thresholds
(Note 2)
Zero Crossing Threshold
CSHX - CSLX (positive current)
CSHX - CSLX (negative current)
CSHX - CSLX PSAVE# = 0V, not tested
40 55 70
-50
5
UNITS
mV
mV
Soft-Start Ramp Time
Oscillator Frequency
Maximum Duty Factor
SYNC Input High Pulse
SYNC Input Low Pulse
Width
SYNC Rise/Fall Time
SYNC Input Frequency
Range
Current-Sense Input
Leakage Current
DC Loop Gain
Gain Bandwidth Product
Output Resistance
VL Output Voltage
VL Undervoltage Lockout
Fault Threshold
VL Switchover Lockout
REF Output Voltage
REF Load Regulation
From enable to 95% full current limit,
with respect to fOSC
SYNC = VL
SYNC = 0V
SYNC = VL
SYNC = 0V
Not tested
Not tested
Not tested
CSH3 = 3.3V, CSH5 = 5.0V
ERROR AMP
From internal feedback node to COMP3/COMP5
COMP3, COMP5
INTERNAL REGULATOR AND REFERENCE
SHDN# = V+; 6V < V+ <30V,
0mA <I < LOAD 30mA, ON3 = ON5 = 0V
Falling edge, hysteresis = 0.7V
Switchover at startup - rising edge
No external load
0µA < ILOAD < 50µA
0mA < ILOAD < 5mA
512
clks
220 300 380 kHz
170 200 230
92 94
%
94 96
300
ns
300
200
240 -
kHz
350
3
10
µA
18
V/V
8
MHz
25
Kohms
4.6
5.25
V
3.5 3.7 4.1
4.5
2.45 2.5 2.55
12.5 mV
50
2004 Semtech Corp.
3
www.semtech.com
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