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| LM3481 Datasheet, PDF (4/22 Pages) National Semiconductor (TI) – High Efficiency Low-Side N-Channel Controller for Switching Regulators | |||
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Symbol
VSENSE
VSC
VSL
VOVP
VOVP(HYS)
Gm
AVOL
IEAO
VEAO
tSS
tr
tf
VSD
ISD
TSD
Tsh
θJA
Parameter
Conditions
Current Sense Threshold
Voltage
Over Load Current Limit
Sense Voltage
Internal Compensation
Ramp Voltage
Output Over-voltage
Protection (with respect to VCOMP = 1.4V
feedback voltage) (Note 7)
Output Over-Voltage
Protection Hysteresis
VCOMP = 1.4V
Error Amplifier
Transconductance
VCOMP = 1.4V
Error Amplifier Voltage
Gain
VCOMP = 1.4V
IEAO = 100 µA (Source/Sink)
Error Amplifier Output
Current (Source/ Sink)
Source, VCOMP = 1.4V, VFB =
1.1V
Sink, VCOMP = 1.4V, VFB = 1.4V
Upper Limit
Error Amplifier Output
Voltage Swing
VFB = 0V
COMP Pin Floating
Lower Limit
VFB = 1.4V
Internal Soft-Start Delay VFB = 1.2V, COMP Pin Floating
Drive Pin Rise Time
Cgs = 3000 pf, VDR = 0V to 3V
Drive Pin Fall Time
Cgs = 3000 pf, VDR = 3V to 0V
Shutdown signal threshold Output = High (Shutdown)
(Note 5) FA/SYNC/SD pin Output = Low (Enable)
Shutdown Pin Current
FA/SYNC/SD pin
Thermal Shutdown
VSD = 5V
VSD = 0V
Thermal Shutdown
Hysteresis
Thermal Resistance
MM Package
Min
100
157
26
28
216
35
475
31
2.45
0.32
0.40
Typical
160
220
90
85
70
450
60
640
65
2.70
0.60
15
25
25
1.31
0.68
â1
20
165
10
200
Max
190
275
135
106
690
66
837
100
2.93
0.90
1.40
Units
mV
mV
mV
mV
mV
µmho
V/V
µA
µA
V
V
ms
ns
ns
V
V
µA
°C
°C
°C/W
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