UC384XBD MOTOROLA [Motorola, Inc], UC384XBD Datasheet - Page 12

• Manufacturer Part Number: UC384XBD
• Description: HIGH PERFORMANCE CURRENT MODE CONTROLLERS
• Manufacturer: MOTOROLA [Motorola, Inc]

12
Error Amp compensation circuit for stabilizing any current mode topology except
for boost and flyback converters operating with continuous inductor current.
From V O
R d
R i
R f 8.8k
C f
R f
1(1)
2(3)
2.5V
EA
+
–
5.0V Ref
+
The MCR101 SCR must be selected for a holding of < 0.5 mA @ T A(min) . The
simple two transistor circuit can be used in place of the SCR as shown. All
resistors are 10 k.
MCR
101
1.0mA
Comp/Latch
UC3844B, 45B UC2844B, 45B
Figure 28. Error Amplifier Compensation
S
R
T
Q
2R
Figure 26. Isolated MOSFET Drive
R
Figure 27. Latched Shutdown
3905
5(9)
+
2N
–
7(12)
V CC
3903
8(14)
2N
7(11)
6(10)
5(8)
3(5)
4(7)
2(3)
1(1)
C
Boundary
Isolation
R
R S
EA
R
R
N S
+
Osc
Q1
1.0 mA
Bias
V in
N P
+
0
–
C p
Error Amp compensation circuit for stabilizing current mode boost
and flyback topologies operating with continuous inductor current.
From V O
2R
R p
R
I pk =
50% DC
V GS Waveforms
5(9)
R i
MOTOROLA ANALOG IC DEVICE DATA
R d
V (Pin 1) – 1.4
C f
3 R S
+
0
–
25% DC
R f
1(1)
2(3)
N S
N p
2.5V
EA
+
1.0mA
2R
R
5(9)