Texas Instruments LM3431 Evaluation Board LM3431EVAL/NOPB LM3431EVAL/NOPB 데이터 시트
제품 코드
LM3431EVAL/NOPB
SNVS547G – NOVEMBER 2007 – REVISED MAY 2013
ELECTRICAL CHARACTERISTICS (continued)
Specifications in standard type are for T
J
= 25°C only, and limits in boldface type apply over the junction temperature (T
J
)
range of -40°C to +125°C. Unless otherwise stated, V
IN
= 12V. Minimum and Maximum limits are specified through test,
design, or statistical correlation. Typical values represent the most likely parametric norm at T
J
= 25°C, and are provided for
reference purposes only.
Parameter
Test Conditions
Min
Typ
Max
Units
PROTECTION
V
SC_SHORT
SC high threshold
LED short circuit fault, SC rising
5.7
6
6.2
V
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
39
57
73
µA
I
DLY_SK
DLY sink current
DLY = 1.0V
1.8
µA
V
DLY
DLY threshold voltage
DLY rising
2.40
2.8
3.16
V
V
DLY_reset
DLY reset threshold voltage
DLY falling
350
mV
T
DLY_BLK
DLY blank time
DIM rising
1.6
µs
V
THM
THM threshold
1.19
1.23
1.27
V
I
THM
THM hysteresis current
THM = 1V
9.6
µA
I
ILIM
ILIM max source current
COMP = 2.0V
31
40
46
µA
V
AFB_max
AFB overvoltage threshold
1.87
2.0
2.22
V
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
µA
CFB
TC
CFB temperature coefficient
-2.6
mV/°C
Δ
V
CFB
/
Δ
V
IN
CFB Line regulation
5.5V < VIN < 36V
0.001
%/V
I
SS/SH
SS/SH source current
At EN going high
13
19
24
µA
V
SS_END
SS/SH voltage
At end of soft-start cycle
1.80
1.85
1.90
V
V
RT
RT voltage
R
RT
= 34.8 k
Ω
1.22
V
F
SW
Switching Frequency
R
RT
= 34.8 k
Ω
651
700
749
kHz
Minimum Switching Frequency
R
RT
= 130 k
Ω
180
200
220
Maximum Switching Frequency
R
RT
= 22.6 k
Ω
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
µA
I
COMP_SK
COMP sink current
VCOMP =1.2V, AFB = 1.5V
150
µA
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
Ω
Sink Current = 200 mA
2.2
Ω
I
LG
Driver Output Current
Source, LG = 2.5V, VIN = 5.5V
0.35
A
Sink, LG = 2.5V
0.70
A
Copyright © 2007–2013, Texas Instruments Incorporated
5
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