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参数资料
| 型号： | LM2645MTD/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 335 kHz SWITCHING FREQ-MAX, PDSO48 |
| 封装： | TSSOP-48 |
| 文件页数： | 2/20页 |
| 文件大小： | 911K |
| 代理商： | LM2645MTD/NOPB |
Electrical Characteristics (Continued)
Unless otherwise specified, V
IN = 15V, SGND = PGND = 0V, VLIN5 = VDD1 = VDD2. Limits appearing in boldface type apply
over the entire operating junction temperature range, 0C to +125C. Specifications appearing in plain type are measured using
low duty cycle pulse testing with T
A = 25C (Note 5), (Note 6). Min/Max limits are guaranteed by design, test, or statistical
analysis.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
SYSTEM
Oscillator
F
osc
Oscillator Frequency
F
SEL =5V
265
300
335
kHz
F
SEL =0V
174
200
226
kHz
Don_max
Maximum On-Duty Cycle
V
FB1 =VFB2 = 1V, Measured at pins
HDRV1 and HDRV2
96
98
%
T
on_min
Minimum On-Time
150
ns
Error Amplifier
I
FB1,IFB2
Feedback Input Bias
Current
V
FB1_FIX = 1.5V, VFB2_FIX = 1.5V
90
250
nA
I
comp1_SC,
I
comp2_SC
COMP Output Source
Current
V
FB1_FIX =VFB2_FIX = 1V,
V
COMP1 =VCOMP2 =1V
27
104
A
I
comp1_SK,
I
comp2_SK
COMP Output Sink
Current
V
FB1_FIX =VFB2_FIX = 1.5V and
V
COMP1 =VCOMP2 = 0.5V
27
99
A
Voltage References and Linear Voltage Regulators
UVLO
VLIN5 Under-voltage
Lockout Threshold
(Rising)
SS1, SS2 transition from low to high
3.6
4.0
4.4
V
R_EXT
EXT pin ON-Resistance
V
EXT = 5V, IVLIN5=25mA
3
EXT_TH
VLIN5-to-EXT Switch
Over Threshold
Rising edge of V
EXT
4.7
V
OUT3
3.3V Linear Regulator
Output Voltage
0mA < IOUT3 < 50mA, 5.5V
≤ VIN ≤
30V, V
EXT=5V
3.306
3.3
3.564
V
I
OUT3
3.3V Linear regulator
Current limit threshold
ON1 = HIGH, EXT = 5V
100
mA
I
LDODRV
LDODRV pin Sink
Current
V
LDODRV = 11V, VLDOFB = 1.1V
4.0
6mA
V
LDOFB
LDODRV Feedback
Voltage
3.5V
≤ V
LDODRV
≤ 12V
1.215
1.240
1.265
V
Accuracy with Load
3.5V
≤ LDO power supply voltage ≤
15V, I
LDODRV = 500A
1.236
V
I
LDOFB
LDOFB Leakage Current
(Sourcing)
V
LDOFB = 1.4V
50
100
nA
V
2NDFB
Secondary winding
voltage feedback detect
threshold
Falling Edge
1.3
1.5
1.7
V
Logic Inputs
V
IH
Minimum High Level
Input Voltage (SD,
FPWM/2NDFB, ON1,
ON2, F
SEL)
2.0
V
IL
Maximum Low Level
Input Voltage for
FPWM/2NDFB, ON1
ON2, F
SEL)
0.8
V
SD
0.6
V
LM2645
www.national.com
10
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