Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 8/10
HI-SINCERITY
MICROELECTRONICS CORP.
Latched Shutdown
4
8
OSC
R
BIAS
+
R
1mA
2R
+
-
2
EA
1
R
5
2N3905
2N3903
SCR must be selected for a holding current of less than
0.5mA at TA(min). The simple two transistor circuit can be
used in place of the SCR as shown. All resistors are 10K.
Error Amplifier Compensation
+
+
From Vo
2.5V
1mA
Ri
+
-
2R
2
Error Amp compensation circuit for
stabilizing any current-mode topology
except for boost and flyback converters
operating with continuous inductor
current
EA
EA
R
5
Rd
Cf Rf
1
From Vo
Rp
2.5V
1mA
+
-
2R
2
1
Error Amp compensation circuit for
stabilizing current-mode boost and
flyback topologies operating with
continuous inductor current.
Ri
R
5
Cp
Rd
Cf Rf
External Clock Synchronization
Vref
8
4
R
R
RT
CT
BIAS
OSC
+
External
The diode clamp is
required if the Sync
Sync Input
+
-
2R
0.01uF
2
1
amplitude is large enough
EA
R
to cause the bottom side
47Ω
5
of CT to go more than
300mV below ground
H3842P
HSMC Product Specification
HSMC [ HI-SINCERITY MOCROELECTRONICS ]
