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UC2845N Fiches technique(PDF) 10 Page - ON Semiconductor

No de pièce UC2845N
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Fabricant  ONSEMI [ON Semiconductor]
Site Internet  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC2845N Fiches technique(HTML) 10 Page - ON Semiconductor

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UC3844, 45 UC2844, 45
10
MOTOROLA ANALOG IC DEVICE DATA
Figure 19. Adjustable Reduction of Clamp Level
Figure 20. Soft–Start Circuit
Figure 21. Adjustable Buffered Reduction of
Clamp Level with Soft–Start
Figure 22. 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 19 and 21.
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 µF
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 23. 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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