H3842S Datasheet, PDF (8/10 Pages) Hi-Sincerity Mocroelectronics – HIGH PERFORMANCE CURRENT MODE CONTROLERS

HI-SINCERITY
MICROELECTRONICS CORP.
Spec. No. : HS200203
Issued Date : 2001.04.01
Revised Date : 2002.12.03
Page No. : 8/10
Latched Shutdown
2N3905
4
OSC
8
R
BIAS
+
R
2
+
-
1
EA
1mA
2R
R
5
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
Ri
+
2-
EA
Rd
Cf Rf
1
+
1mA
From Vo
2.5V
+
Rp
+
2-
Ri
EA
Cp
Rd Cf Rf
1
1mA
2R
R
5
2R
R
5
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.
External Clock Synchronization
Vref 8
RT
4
CT
External
Sync Input
0.01uF
2
1
47Ω
R
R
+
+
- _EA
BIAS
OSC
2R
R
5
H3842S
The diode clamp is
required if the Sync
amplitude is large enough
to cause the bottom side
of CT to go more than
300mV below ground
HSMC Product Specification