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UC3844 Datasheet(PDF) 11 Page - ON Semiconductor

Part # UC3844
Description  HIGH PERFORMANCE CURRENT MODE CONTROLLERS
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

UC3844 Datasheet(HTML) 11 Page - ON Semiconductor

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UC3844, 45 UC2844, 45
11
MOTOROLA ANALOG IC DEVICE DATA
The MCR101 SCR must be selected for a holding of less than 0.5 mA at
TA(min). The simple two transistor circuit can be used in place of the SCR as
shown. All resistors are 10 k.
Figure 24. MOSFET Parasitic Oscillations
Figure 25. Bipolar Transistor Drive
Figure 26. Isolated MOSFET Drive
Figure 27. Latched Shutdown
Figure 28. Error Amplifier Compensation
The totem–pole output can furnish negative base current for enhanced
transistor turn–off, with the addition of capacitor C1.
Error Amp compensation circuit for stabilizing any current–mode topology except
for boost and flyback converters operating with continuous inductor current.
Error Amp compensation circuit for stabilizing current–mode boost and flyback
topologies operating with continuous inductor current.
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.
Q1
RS
3(5)
5(8)
R
S
Q
Comp/Latch
5.0Vref
Vin
VCC
7(11)
6(10)
+
+
+
+
7(12)
+
Rg
Q1
RS
3(5)
5(8)
Vin
6(1)
C1
IB
+
0
Base Charge
Removal
Q1
3(5)
5(8)
R
S
Q
Comp/Latch
5.0Vref
Vin
VCC
7(11)
6(10)
+
+
+
+
7(12)
+
Np
R
C
RS
NS
Isolation
Boundary
VGS Waveforms
+
0
+
0
Ipk =
V(pin 1) – 1.4
3 RS
NP
NS
50% DC
25% DC
5(9)
R
R
Bias
Osc
8(14)
4(7)
2(3)
1(1)
2R
R
EA
+
+
1.0mA
2N
3903
2N
3905
MCR
101
5(9)
2(3)
1(1)
2R
R
EA
+
+
1.0mA
CI
Rf
Ri
Rd
From VO
2.5V
5(9)
2(3)
1(1)
2R
R
EA
+
+
1.0mA
Cp
CI
Rf
From VO
Rp
Rd
Ri
2.5V
T
Rf ≥ 8.8 k
T


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