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参数资料
| 型号： | LM3431SD |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, QCC28 |
| 封装： | LLP-28 |
| 文件页数： | 20/24页 |
| 文件大小： | 549K |
| 代理商： | LM3431SD |
Symbol
Parameter
Conditions
Min
Typ
Max
Units
V
DIM
DIM threshold
MODE/F > 4V
1.9
2.3
V
hysteresis
0.8
V
T
DIM
Minimum internal DIM pulse width
(Note 8)
0.4
s
DIM
DLY_R
DIM to NDRV delay time
DIM rising
100
ns
DIM
DLY_F
DIM to NDRV delay time
DIM falling
90
ns
TH
MODE/F
MODE/F threshold
For Digital Dimming control
3.8
V
I
MODE/F
MODE/F source/sink current
40
uA
V
MODE_L
MODE/F minimum voltage
Analog dimming mode
0.37
V
MODE_H
MODE/F peak voltage
Analog dimming mode
2.5
V
Protection
V
SC_SHORT
SC high threshold
LED short circuit fault, SC rising
5.7
6
6.2
V
SC_OPEN
SC open clamp voltage
LED open circuit fault, SC rising
3.16
3.50
3.87
V
I
DLY_SC
DLY source current
DLY = 1.0V
57
A
I
DLY_SK
DLY sink current
DLY = 1.0V
1.8
A
V
DLY
DLY threshold voltage
DLY rising
2.8
V
DLY_reset
DLY reset threshold voltage
DLY falling
350
mV
T
DLY_BLK
DLY blank time
DIM rising
1.6
s
V
THM
THM threshold
1.19
1.23
1.27
V
I
THM
THM hysteresis current
THM = 1V
9.6
A
I
ILIM
ILIM max source current
COMP = 2.0V
31
40
46
A
V
AFB_max
AFB overvoltage threshold
1.87
2.0
2.22
V
AFB_UVP
AFB undervoltage threshold
AFB falling
0.73
0.85
0.98
V
T
SD
Thermal shutdown threshold
160
°C
Boost controller
V
CFB
CFB voltage
DIM high
1.60
1.71
1.82
V
I
CFB
CFB source current
DIM high
35
50
65
A
CFB
TC
CFB temperature coefficient
-2.6
mV/°C
ΔV
CFB / ΔVIN
CFB Line regulation
5.5V < VIN < 36V
0.001
%/V
I
SS/SH
SS/SH source current
At EN going high
13
19
24
A
V
SS_END
SS/SH voltage
At end of soft-start cycle
1.80
1.85
1.90
V
RT
RT voltage
R
RT = 34.8 k
1.22
V
F
SW
Switching Frequency
R
RT = 34.8 k
651
700
749
kHz
Minimum Switching Frequency
R
RT = 130 k
180
200
220
Maximum Switching Frequency
R
RT = 22.6 k
900
1000
1100
T
on_min
Minimum on time
170
230
ns
D
MAX
Maximum duty cycle
80
85
%
ILIM
gm
ILIM amplifier transconductance
COMP to ILIM gain
85
umho
Vslope
Slope compensation
Peak voltage per cycle
75
mV
I
COMP_SC
COMP source current
VCOMP = 1.2V, AFB = 0.5V
155
A
I
COMP_SK
COMP sink current
VCOMP =1.2V, AFB = 1.5V
150
A
EA
gm
Error amplifier transconductance
CFB to COMP gain, DIM high
230
umho
R
LG
Gate Drive On Resistance
Source Current = 200 mA, VIN = 5.5V
6.4
Sink Current = 200 mA
2.2
I
LG
Driver Output Current
Source, LG = 2.5V, VIN = 5.5V
0.35
A
Sink, LG = 2.5V
0.70
A
5
www.national.com
LM3431
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