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LM3488 Datasheet(PDF) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
No. de pieza LM3488
Descripción Electrónicos  High Efficiency Low-Side N-Channel Controller for Switching Regulators
Download  24 Pages
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Fabricante Electrónico  NSC [National Semiconductor (TI)]
Página de inicio  http://www.national.com
Logo NSC - National Semiconductor (TI)

LM3488 Datasheet(HTML) 4 Page - National Semiconductor (TI)

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Electrical Characteristics (Continued)
Specifications in Standard type face are for T
J = 25˚C, and in bold type face apply over the full Operating Temperature
Range. Unless otherwise specified, V
IN = 12V, RFA = 40k
Symbol
Parameter
Conditions
Typical
Limit
Units
V
SC
Short-Circuit Current
Limit Sense Voltage
V
IN = 5V
325
235
395
mV
mV (min)
mV (max)
V
SL
Internal Compensation
Ramp Voltage
V
IN =5V
92
52
132
mV
mV(min)
mV(max)
V
OVP
Output Over-voltage
Protection (with
respect to feedback
voltage) (Note 8)
V
COMP = 1.4V
50
32/ 25
78/ 85
mV
mV(min)
mV(max)
V
OVP(HYS)
Output Over-Voltage
Protection
Hysteresis(Note 8)
V
COMP = 1.4V
60
20
110
mV
mV(min)
mV(max)
Gm
Error Ampifier
Transconductance
V
COMP = 1.4V
I
EAO = 100µA
(Source/Sink)
800
600/ 365
1000/ 1265
µmho
µmho (min)
µmho (max)
A
VOL
Error Amplifier Voltage
Gain
V
COMP = 1.4V
I
EAO = 100µA
(Source/Sink)
38
26
44
V/V
V/V (min)
V/V (max)
I
EAO
Error Amplifier Output
Current (Source/ Sink)
Source, V
COMP = 1.4V,
V
FB =0V
110
80/ 50
140/ 180
µA
µA (min)
µA (max)
Sink, V
COMP = 1.4V, VFB
= 1.4V
−140
−100/ −85
−180/ −185
µA
µA (min)
µA (max)
V
EAO
Error Amplifier Output
Voltage Swing
Upper Limit
V
FB =0V
COMP Pin = Floating
2.2
1.8
2.4
V
V(min)
V(max)
Lower Limit
V
FB = 1.4V
0.56
0.2
1.0
V
V(min)
V(max)
T
SS
Internal Soft-Start
Delay
V
FB = 1.2V, VCOMP =
Floating
4
msec
T
r
Drive Pin Rise Time
Cgs = 3000pf, V
DR =0 to
3V
25
ns
T
f
Drive Pin Fall Time
Cgs = 3000pf, V
DR =0 to
3V
25
ns
VSD
Shutdown and
Synchronization signal
threshold (Note 5)
Output = High
1.27
1.35
V
V (max)
Output = Low
0.65
0.35
V
V (min)
I
SD
Shutdown Pin Current
V
SD =5V
−1
µA
V
SD =0V
+1
TSD
Thermal Shutdown
165
˚C
T
sh
Thermal Shutdown
Hysteresis
10
˚C
θ
JA
Thermal Resistance
MM Package
200
˚C/W
www.national.com
4


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