HSMC3842 Hi-Sincerity Mocroelectronics, HSMC3842 Datasheet - Page 9

• Manufacturer Part Number: HSMC3842
• Description: HIGH PERFORMANCE CURRENT MODE CONTROLERS
• Manufacturer: Hi-Sincerity Mocroelectronics

f=1.44/((RA+2RB)C), Dmax=RB/(RA+2RB)
H3842P
External Duty Cycle Clamp and Multi Unit Synchronization
Soft-Start Circuit
Soft-Start and Error Amplifier Output Duty Cycle Clamp
Vref
C
RA
RB
C
6
5
2
R2
R1
HI-SINCERITY
MICROELECTRONICS CORP.
C
BC109
1
Vclamp=R1/(R1+R2) where 0<Vclamp<1V, Ipk(max)=Vclamp/RS
8
4
2
1
1MΩ
8
5KΩ
5KΩ
5KΩ
+
+
-
-
+
-
8
4
2
1
EA
+
R
R
1mA
R
S
NE555
+
-
EA
4
Q
Vclamp
+
BIAS
OSC
R
R
2R
1mA
5
R
BIAS
OSC
1V
3
7
2R
5Vref
+
-
+
5
R
Comp/Latch
S
R
4
8
2
1
1V
+
5Vref
+
-
Q
7
+
-
+
-
EA
S
R
+
To Additional
H3842
R
R
Q
Vcc
7
6
5
Spec. No. : HP200202
Issued Date : 1998.08.01
Revised Date : 2002.12.03
Page No. : 9/10
HSMC Product Specification
BIAS
OSC
2R
Q1
Vin
Rs
5
R