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UC2844NG Fiches technique(PDF) 10 Page - ON Semiconductor

No de pièce UC2844NG
Description  High Performance Current Mode Controllers
Download  16 Pages
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC2844NG Fiches technique(HTML) 10 Page - ON Semiconductor

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UC3844, UC3845, UC2844, UC2845
http://onsemi.com
10
Figure 20. Adjustable Reduction of Clamp Level
Figure 21. Soft−Start Circuit
Figure 22. Adjustable Buffered Reduction of
Clamp Level with Soft−Start
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
Ipk(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
RS
3(5)
5(8)
1.0V
R
S
Q
Comp/Latch
5.0Vref
VClamp
Vin
VCC
7(11)
6(10)
+
+
+
+
7(12)
+
R1 R2
R2
VClamp
1.67
+ 1
+ 0.33 x 10−3
Ipk(max)
VClamp
RS
Where: 0
≤ VClamp ≤ 1.0 V
R2
R1
1.0mA
R1
R1 + R2
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
1.0V
R
S
Q
5.0Vref
+
+
+
C
tSoft−Start  3600C in mF
1.0mA
5(9)
R
R
Bias
OSC
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
Q1
RS
3(5)
5(8)
1.0V
R
S
Q
Comp/Latch
5.0Vref
VClamp
Vin
VCC
7(11)
6(10)
+
+
+
+
7(12)
+
MPSA63
R1
R2
C
tSoftstart = − In
1 −
VC
R1 R2
C
R2
VClamp
1.67
+ 1
Ipk(max)
VClamp
RS
Where: 0
≤ VClamp ≤ 1.0 V
1.0mA
R1
3VClamp
R1 + R2
RS
1/4 W
(5)
(8)
R
S
Q
Comp/Latch
5.0Vref
Vin
VCC
(11)
(10)
+
+
+
+
(12)
+
Power Ground
To Input Source
Return
VPin 5 ≈
If: SENSEFET = MTP10N10M
RS = 200
Then: Vpin 5 = 0.075 Ipk
SENSEFET
RS Ipk rDS(on)
M
G
D
S
K
Control CIrcuitry
Ground:
To Pin (9)
rDM(on) + RS
+ 0.33 x 10−3
R1 R2
R1 + R2
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
RS
3(5)
5(8)
R
S
Q
Comp/Latch
5.0Vref
Vin
VCC
7(11)
6(10)
+
+
+
+
7(12)
+
R
C
T
T
T
T
T


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