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| GM3842A Datasheet, PDF (11/19 Pages) Gamma Microelectronics Inc. – HIGH PERFORMANCE CURRENT MODE PWM CONTROLLERS | |||
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Figure 10. External Clock Synchronization
External 0.01
Sync
Input
* The diode clamp is required if the Sync amplitude is
large enough to cause the bottom side of CT to go
more than 300 mV below ground.
8
Vref
RT
4
CT
47
2
1
R
Internal
Bias
R
Oscillartor
+
+
2R
-
Error
Amplifier
R
5
Figure 11. External DUTY CYCLE CLAMP and multi-unit synchronization
8
RA
8
4
RB
5.0k
6
+
R
-
5
Q
5.0k
2
+
S
-
C
5.0k
1
R
Internal
Bias
R
3
4
Oscillator
+
7
+
2R
2
-
Error
Amplifier
1
R
GND 5
To Additional GM384XA series
1.44
f=
(RA + 2RB) C
RB
Dmax
RA + 2RB
11
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