H3842S Datasheet, PDF (9/10 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. : 9/10
External Duty Cycle Clamp and Multi Unit Synchronization
Vref
RA
8
4
RB
5KΩ
6
+
5
R
-
3
7
5KΩ
Q
+
2
S
-
C
5KΩ
1
NE555
f=1.44/((RA+2RB)C), Dmax=RB/(RA+2RB)
8
R
BIAS
R
4
OSC
+
+
2
-
EA
1
2R
R
5
To Additional
H3842
Soft-Start Circuit
8
4
2
1MΩ
1
C
R
R
+
+
-
EA
1mA
BIAS
OSC
5Vref
+
-
+
2R
R 1V ^-
5
S
Q
R
Soft-Start and Error Amplifier Output Duty Cycle Clamp
7
8
5Vref
R
+
BIAS
-
R
4
2
1
R2
+
+
-
EA
1mA
OSC
Vclamp
2R
R
1V ⁺
S
Q
R
Comp/Latch
5
C
R1 _BC109
Vcc Vin
7
6
Q1
5
Rs
Vclamp=R1/(R1+R2) where 0<Vclamp<1V, Ipk(max)=Vclamp/RS
H3842S
HSMC Product Specification