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UC3845BDR2G Datasheet(PDF) 10 Page - ON Semiconductor

Part # UC3845BDR2G
Description  High Performance Current Mode Controllers
Download  19 Pages
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3845BDR2G Datasheet(HTML) 10 Page - ON Semiconductor

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UC3844B, UC3845B, UC2844B, UC2845B
http://onsemi.com
10
If: SENSEFET = MTP10N10M
RS = 200
Figure 20. Adjustable Reduction of Clamp Level
Figure 21. Soft−Start Circuit
Figure 22. Adjustable Buffered Reduction of
Clamp Level with Soft−Start
+
-
5.0V Ref
+
-
S
R
Q
Bias
+
Osc
R
R
R
2R
EA
1.0V
5(9)
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
1(1)
2(3)
4(7)
8(14)
R1
VClamp
R2
Ipk(max) [
VClamp
RS
Where: 0
≤ VClamp ≤ 1.0 V
5.0V Ref
+
-
S
R
Q
Bias
+
1.0mA
Osc
R
R
R
2R
EA
1.0V
5(9)
1(1)
2(3)
4(7)
8(14)
C
1.0M
tSoft-Start ≈ 3600C in mF
+
-
+
-
S
R
+
R
R
R
2R
Ipk(max) [
VClamp
RS
Figure 23. Current Sensing Power MOSFET
5.0V Ref
Q
Bias
Osc
EA
1.0V
5(9)
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
1(1)
2(3)
4(7)
8(14)
R1
R2
Where: 0
≤ VClamp ≤ 1.0 V
MPSA63
+
-
5.0V Ref
+
-
S
R
Q
(11)
(10)
(8)
Comp/Latch
(5)
RS
1/4 W
VCC
Vin
K
M
D
SENSEFET
G
S
Power Ground:
To Input Source
Return
Control Circuitry Ground:
To Pin (9)
Virtually lossless current sensing can be achieved with the implementation
of a SENSEFET
t power switch. For proper operation during over-current
conditions, a reduction of the Ipk(max) clamp level must be implemented.
Refer to Figures 20 and 22.
VPin 5 [
RS Ipk rDS(on)
rDM(on) ) RS
Then : VPin 5 [ 0.075 Ipk
7(12)
7(12)
1.0 mA
Comp/Latch
Comp/Latch
1.0 mA
(12)
T
T
T
T
VClamp
VClamp
1.67
R2
R1
) 1
+ 0.33x10-3
R1R2
R1 ) R2
VClamp
1.67
R2
R1
) 1
tSoftStart +* In 1 *
VC
3VClamp
C
R1 R2
R1 ) R2


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