H3842S Datasheet, PDF (7/10 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. : 7/10
Current Sense Circuit
Error Ampl.
Is
COMP 1
R
3
Current
Sense
Rs
C
5
GND
2R
R
Current
Sense
Comparator
1V
Peak current (Is) is determined by the formula
Is(max.) ≈ 1V/Rs
A small RC filter may be required to suppress switch transients.
Slope Compensation Techniques
Is
RSLOPE
R1
Rs
VREG
8
RT
RT/CT
4
CT
H3842
I SENSE
3
5
GND
Is
RSLOPE
R1
Rs
VREG
8
RT
RT/CT
4
CT
H3842
I SENSE
3
5
GND
Isolated MOSFET Drive and Current Transformer Sensing
Vcc
Vin
5.0Vref
7
+
-
+
-
S
RQ
+ _COMP/Latch
Isolation
Boundary
Q1
6
3
R
VGS Waveforms
+
0
-
50%DC
+
0
-
25%DC
Ipk=((Vpin1-1.4)/3Rs)(Ns/Np)
C
Rs
Ns Np
H3842S
HSMC Product Specification