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參數(shù)資料
| 型號： | UC3845 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | High Performance Current Mode Controllers(高性能電流模式控制器) |
| 中文描述： | 高性能電流模式控制器（高性能電流模式控制器） |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 354K |
| 代理商： | UC3845 |
UC3844, UC3845, UC2844, UC2845
http://onsemi.com
10
Figure 20. Adjustable Reduction of Clamp Level
Figure 21. SoftStart Circuit
Figure 22. Adjustable Buffered Reduction of
Clamp Level with SoftStart
Figure 23. Current Sensing Power MOSFET
Virtually lossless current sensing can be achieved with the implement of a SENSEFET
power switch. For proper operation during over current conditions, a reduction of the
I
pk(max)
clamp level must be implemented. Refer to Figures 20 and 22.
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
Q1
R
S
3(5)
5(8)
1.0V
R
Comp/Latch
5.0V
ref
V
Clamp
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
R
1
R
2
R
1
+ R
2
R
2
R
1
V
Clamp
1.67
+ 1
+ 0.33 x 10
3
I
pk(max)
≈
V
Clamp
R
S
Where: 0
≤
V
Clamp
≤
1.0 V
R2
R1
1.0mA
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
1.0V
R
5.0V
ref
+
+
C
t
SoftStart
3600C in F
1.0mA
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
Q1
R
S
3(5)
5(8)
1.0V
R
Comp/Latch
5.0V
ref
V
Clamp
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
MPSA63
R1
R2
C
t
Softstart
= In
1
V
C
R
1
R
2
R
1
+ R
2
C
R
2
R
1
V
Clamp
1.67
+ 1
I
pk(max)
≈
V
Clamp
R
S
Where: 0
≤
V
Clamp
≤
1.0 V
1.0mA
3V
Clamp
R
S
1/4 W
(5)
(8)
R
Comp/Latch
5.0V
ref
V
in
V
CC
(11)
(10)
+
+
+
(12)
+
Power Ground
To Input Source
Return
V
Pin
5
≈
If: SENSEFET = MTP10N10M
R
S
= 200
Then: V
pin
5 = 0.075 I
pk
SENSEFET
R
S
I
pk
r
DS(on)
r
DM(on)
+ R
S
M
G
D
S
K
Control CIrcuitry
Ground:
To Pin (9)
+ 0.33 x 10
3
R
1
R
2
R
1
+ R
2
Figure 24. Current Waveform Spike Suppression
The addition of the RC filter will eliminate
instability caused by the leading edge spike on
the current waveform.
Q1
R
S
3(5)
5(8)
R
Comp/Latch
5.0V
ref
V
in
V
CC
7(11)
6(10)
+
+
+
7(12)
+
R
C
T
1
T
T
T
T
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