SC1403 Просмотр технического описания (PDF) - Semtech Corporation
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SC1403 Datasheet PDF : 31 Pages
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SC1403
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 UNITS
Current-Limit Thresholds (2)
CSHX - CSLX (positive current)
40 55 70
mV
Zero Crossing Threshold
CSHX - CSLX (negative current)
CSHX - CSLX PSAVE# = 0V, not tested
-50
5
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
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, CSH5 Input Leakage
Current
CSH3 = 3.3V, CSH5 = 5.0V
ERROR AMP
DC Loop Gain
From internal feedback node to COMP3/COMP5
Gain Bandwidth Product
Output Resistance
COMP3, COMP5
INTERNAL REGULATOR AND REFERENCE
VL Output Voltage
VL Undervoltage Lockout
Fault Threshold
SHDN# = V+; 6V < V+ <30V,
0mA < ILOAD < 30mA, ON3 = ON5 = 0V
Falling edge, hysteresis = 0.7V
VL Switchover Lockout
Switchover at startup - rising edge
REF Output Voltage
No external load
REF Load Regulation
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
United States Patent No. 6,377,032
www.semtech.com
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