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参数资料
| 型号： | L296 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | 7.5 A SWITCHING REGULATOR, 200 kHz SWITCHING FREQ-MAX, PZFM15 |
| 封装： | PLASTIC, POWER PACK-15 |
| 文件页数： | 7/22页 |
| 文件大小： | 285K |
| 代理商： | L296 |
Figure 35 : P.C. Board and Component Layout of the Circuit of fig. 34 (1:1 scale)
SELECTION OF COMPONENT VALUES (see fig. 34)
Component
Recommended
Value
Purpose
Allowed Rage
Notes
Min.
Max.
R1
R2
–
100 k
Set Input Voltage
Threshold for Reset.
–
220k
R1/R2
Vi min
5
1
If output voltage is sensed R1 and
R2 may be limited and pin 12
connected to pin 10.
R3
4.3 k
Sets Switching Frequency
1 k
100k
R4
10 k
Pull-down Resistor
22k
May be omitted and pin 6 grounded
if inhibit not used.
R5
15 k
Frequency Compensation
10k
R6
Collector Load For Reset
Output
VO
0.05A
Omitted if reset function not used.
R7
R8
–
4.7 k
Divider to Set Output
Voltage
–
1k
R7/R8 =
VO
VREF
VREF
-
Riim
–
Sets Current Limit Level
7.5k
If Riim is omitted and pin 4 left open
the current limit is internally fixed.
C1
10
F
Stability
2.2
F
C2
2.2
F
Sets Reset Delay
–
Omitted if reset function not used.
C3
2.2 nF
Sets Switching Frequency
1 nF
3.3nF
C4
2.2
F
Soft Start
1
F
–
Also determines average short
circuit current.
C5
33 nF
Frequency Compensation
C6
390 pF
High Frequency
Compensation
–
Not required for 5 V operation.
C7, C8
L1
100
F
300
H
Output Filter
–
100
H
–
Q1
Crowbar Protection
The SCR must be able to withstand
the peak discharge current of the
output capacitor and the short
circuit current of the device.
D1
Recirculation Diode
7A Schottky or 35 ns trr Diode.
L296 - L296P
15/22
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