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UC3842B Datasheet(PDF) 12 Page - Motorola, Inc

Part # UC3842B
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Manufacturer  MOTOROLA [Motorola, Inc]
Direct Link  http://www.freescale.com
Logo MOTOROLA - Motorola, Inc

UC3842B Datasheet(HTML) 12 Page - Motorola, Inc

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UC3842B, 43B UC2842B, 43B
12
MOTOROLA ANALOG IC DEVICE DATA
Figure 24. Adjustable Buffered Reduction of
Clamp Level with Soft–Start
Figure 25. Current Sensing Power MOSFET
Figure 26. Current Waveform Spike Suppression
Figure 27. MOSFET Parasitic Oscillations
+
+
S
R
+
R
R
R
2R
VClamp [
1.67
R2
R1
) 1
Ipk(max) [
VClamp
RS
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
VClamp
R2
Where: 0
≤ VClamp ≤ 1.0 V
C
MPSA63
tSoft-Start +* In 1 *
VC
3VClamp
C
R1 R2
R1 ) R2
+
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 power switch. For proper operation during over–current conditions, a
reduction of the Ipk(max) clamp level must be implemented. Refer to Figures 22 and 24.
VPin 5 [
RS Ipk rDS(on)
rDM(on) ) RS
If: SENSEFET = MTP10N10M
RS = 200
Then : VPin 5 [ 0.075 Ipk
7(12)
1.0 mA
Comp/Latch
(12)
+
5.0V Ref
+
S
R
Q
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
S
R
5.0V Ref
Q
7(11)
6(10)
5(8)
3(5)
RS
Q1
VCC
Vin
C
R
The addition of the RC filter will eliminate instability caused by the leading
edge spike on the current waveform.
Series gate resistor Rg will damp any high frequency parasitic oscillations
caused by the MOSFET input capacitance and any series wiring inductance in
the gate–source circuit.
7(12)
7(12)
Rg
Comp/Latch
Comp/Latch
+
+


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