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LM3477MMX 데이터시트(PDF) 4 Page - Texas Instruments

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부품명 LM3477MMX
상세설명  LM3477 High Efficiency High-Side N-Channel Controller for Switching Regulator
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홈페이지  http://www.ti.com
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LM3477
SNVS141K – OCTOBER 2000 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics
(1) (continued)
Specifications in Standard type face are for TJ = 25°C, and in bold type face apply over the full Operating Temperature
Range. Unless otherwise specified, VIN = 12V.
Symbol
Parameter
Conditions
Typical
Limit
Units
ISUPPLY
Supply Current (switching)
(2)
2.0
mA
3.0
mA (max)
IQ
Quiescent Current in Shutdown Mode
(3), V
IN = 5V
5
µA
8
µA (max)
VCL(O)
Current Limit Voltage at 0% Duty Cycle
LM3477
155
mV
130/125
mV (min)
185/190
mV (max)
LM3477A
165
mV
140/135
mV (min)
195/200
mV (max)
VCL(100)
Current Limit Voltage at 100% Duty
LM3477
74
mV
Cycle
50/43
mV (min)
98/98
mV (max)
LM3477A
65
mV
41/25
mV (min)
89/98
mV (max)
VSC
Short-Circuit Current Limit Sense
VIN = 5V, LM3477
350
mV
Voltage
270
mV (min)
420
mV (max)
VIN = 5V, LM3477A
310
mV
260
mV (min)
380
mV (max)
VSL
Internal Compensation Ramp Voltage
VIN = 5V, LM3477
83
mV
Height
VIN = 5V, LM3477A
103
VOVP
Output Over-voltage Protection (with
VCOMP = 1.4V
50
mV
32/25
respect to feedback voltage) (4)
mV(min)
78/85
mV(max)
VOVP(HYS)
Output Over-Voltage Protection
VCOMP = 1.4V
60
mV
Hysteresis(4)
20
mV(min)
110
mV(max)
Gm
Error Amplifier Transconductance
VCOMP = 1.4V
750
µmho
IEAO = 100µA (Source/Sink)
600/365
µmho (min)
1000/1265
µmho (max)
AVOL
Error Amplifier Voltage Gain
VCOMP = 1.4V
38
V/V
IEAO = 100µA (Source/Sink)
30
V/V (min)
42
V/V (max)
IEAO
Error Amplifier Output Current (Source/
Source, VCOMP = 1.4V, VFB =
100
µA
Sink)
0V
75/50
µA (min)
130/160
µA (max)
Sink, VCOMP = 1.4V, VFB = 1.4V
−140
µA
−110/−95
µA (min)
−170/−180
µA (max)
VEAO
Error Amplifier Output Voltage Swing
Upper Limit
2.2
V
VFB = 0V
2.0
V(min)
COMP Pin = Floating
2.35
V(max)
Lower Limit
0.75
V
VFB = 1.4V
0.5
V(min)
0.95
V(max)
TSS
Internal Soft-Start Delay
VFB = 1.2V, VCOMP = Floating
5
msec
Tr
Drive Pin Rise Time
CGS = 3000pF, VDR = 0 to 3V
25
ns
Tf
Drive Pin Fall Time
CGS = 3000pF, VDR = 0 to 3V
25
ns
(2)
For this test, the COMP/SD pin must be left floating.
(3)
For this test, the COMP/SD pin must be pulled low.
(4)
The over-voltage protection is specified with respect to the feedback voltage. This is because the over-voltage protection tracks the
feedback voltage. The overvoltage protection threshold is given by adding the feedback voltage, VFB to the over-voltage protection
specification.
4
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