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参数资料
| 型号： | LM78S40CNMDA |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.5 A SWITCHING REGULATOR, 100 kHz SWITCHING FREQ-MAX, UUC |
| 封装： | DIE |
| 文件页数： | 7/13页 |
| 文件大小： | 349K |
| 代理商： | LM78S40CNMDA |
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Ceramic DIP
65C to +175C
Molded DIP
65C to +150C
Operating Temperature Range
Extended (LM78S40J)
55C to +125C
Industrial (LM78S40N)
40C to +125C
Commercial (LM78S40CN)
0C to +70C
Lead Temperature
Ceramic DIP (Soldering, 60 sec.)
300C
Molded DIP (Soldering, 10 sec.)
265C
Internal Power Dissipation (Note 2) (Note 3)
16L-Ceramic DIP
1.50W
16L-Molded DIP
1.04W
Input Voltage from V
IN to GND
40V
Input Voltage from V
+ (Op Amp)
to GND
40V
Common Mode Input Range
(Comparator and Op Amp)
0.3 to V+
Differential Input Voltage
(Note 4)
±30V
Output Short Circuit
Duration (Op Amp)
Continuous
Current from V
REF
10 mA
Voltage from Switch
Collectors to GND
40V
Voltage from Switch
Emitters to GND
40V
Voltage from Switch
Collectors to Emitter
40V
Voltage from Power Diode to GND
40V
Reverse Power Diode Voltage
40V
Current through Power Switch
1.5A
Current through Power Diode
1.5A
ESD Susceptibility
(to be determined)
LM78S40
Electrical Characteristics (Note 5)
T
A = Operating temperature range, VIN = 5.0V, V
+(Op Amp) = 5.0V, unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ
Max
Units
GENERAL CHARACTERISTICS
I
CC
Supply Current
V
IN = 5.0V
1.8
3.5
mA
(Op Amp Disconnected)
V
IN = 40V
2.3
5.0
mA
I
CC
Supply Current
V
IN = 5.0V
4.0
mA
(Op Amp Connected)
V
IN = 40V
5.5
mA
REFERENCE SECTION
V
REF
Reference Voltage
I
REF = 1.0 mA
Extend 55C < T
A <
+125C,
Comm 0 < T
A < +70C,
1.180
1.245
1.310
V
Indus 40C < T
A < +85C
V
R LINE
Reference Voltage
V
IN = 3.0V to VIN = 40V,
0.04
0.2
mV/V
Line Regulation
I
REF = 1.0 mA, TA = 25C
V
R LOAD
Reference Voltage
I
REF = 1.0 mA to IREF = 10 mA,
0.2
0.5
mV/mA
Load Regulation
T
A = 25C
OSCILLATOR SECTION
I
CHG
Charging Current
V
IN = 5.0V, TA = 25C
20
50
A
I
CHG
Charging Current
V
IN = 40V, TA = 25C
20
70
A
I
DISCHG
Discharge Current
V
IN = 5.0V, TA = 25C
150
250
A
I
DISCHG
Discharge Current
V
IN = 40V, TA = 25C
150
350
A
V
OSC
Oscillator Voltage Swing
V
IN = 5.0V, TA = 25C
0.5
V
t
on/toff
Ratio of Charge/
6.0
s/s
Discharge Time
CURRENT LIMIT SECTION
V
CLS
Current Limit Sense
Voltage
T
A = 25C
250
350
mV
OUTPUT SWITCH SECTION
V
SAT 1
Output Saturation Voltage 1
I
SW = 1.0A (Figure 1)
1.1
1.3
V
SAT 2
Output Saturation Voltage 2
I
SW = 1.0A (Figure 2)
0.45
0.7
V
3
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