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| LM3478_09 Datasheet, PDF (4/22 Pages) National Semiconductor (TI) – High Efficiency Low-Side N-Channel Controller for Switching Regulator | |||
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Symbol
VSL
Parameter
Internal Compensation Ramp VIN = 5V
Voltage
Conditions
VOVP
VOVP(HYS)
Output Over-voltage
Protection (with respect to
feedback voltage) (Note 8)
VCOMP = 1.4V
Output Over-Voltage
VCOMP = 1.4V
Protection Hysteresis(Note 8)
Gm
AVOL
IEAO
Error Ampifier
Transconductance
VCOMP = 1.4V
IEAO = 100µA (Source/Sink)
Error Amplifier Voltage Gain VCOMP = 1.4V
IEAO = 100µA (Source/Sink)
Error Amplifier Output Current Source, VCOMP = 1.4V, VFB = 0V
(Source/ Sink)
Sink, VCOMP = 1.4V, VFB = 1.4V
VEAO
TSS
Tr
Tf
VSD
ISD
IFB
TSD
Tsh
θJA
Error Amplifier Output Voltage Upper Limit
Swing
VFB = 0V
COMP Pin = Floating
Lower Limit
VFB = 1.4V
Internal Soft-Start Delay
Drive Pin Rise Time
Drive Pin Fall Time
Shutdown threshold (Note 5)
VFB = 1.2V, VCOMP = Floating
Cgs = 3000pf, VDR = 0 to 3V
Cgs = 3000pf, VDR = 0 to 3V
Output = High
Output = Low
Shutdown Pin Current
Feedback Pin Current
VSD = 5V
VSD = 0V
Thermal Shutdown
Thermal Shutdown Hysteresis
Thermal Resistance
MM Package
Typical
92
50
60
800
38
110
â140
2.2
0.56
4
25
25
1.27
0.65
â1
+1
15
165
10
200
Limit
52
132
32/ 25
78/ 85
20
110
600/ 365
1000/ 1265
26
44
80/ 50
140/ 180
â100/ â85
â180/ â185
1.8
2.4
0.2
1.0
1.4
0.3
Units
mV
mV(min)
mV(max)
mV
mV(min)
mV(max)
mV
mV(min)
mV(max)
µmho
µmho (min)
µmho (max)
V/V
V/V (min)
V/V (max)
µA
µA (min)
µA (max)
µA
µA (min)
µA (max)
V
V(min)
V(max)
V
V(min)
V(max)
msec
ns
ns
V
V (max)
V
V (min)
µA
nA
°C
°C
°C/W
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