MB3759-P Fujitsu Microelectronics, Inc., MB3759-P Datasheet - Page 14

• Manufacturer Part Number: MB3759-P
• Description: Pulse-width-modulation Control Circuit Push-pull/single-ended Output Mode
• Manufacturer: Fujitsu Microelectronics, Inc.

14
MB3759
1. Error Amplifier Gain Adjustment
2. Synchronized Oscillator Operation
APPLICATION IN PRACTICAL CIRCUITS
Take care that the bias current does not become large when connecting an external circuit to the FB pin (pin 3)
for adjusting the amplifier gain. As the FB pin is biased to the low level by a sink current, the duty cycle of the
output signal will be affected if the current from the external circuit is greater than the amplifier can sink.
The figure below shows a suitable circuit for adjusting the gain.
It is very important that you avoid having a capacitive load connected to the output stage as this will affect the
response time.
The oscillator can be halted by connecting the C
internal oscillator and input to the C
Using this method, multiple ICs can be used together in synchronized operation. For synchronized operation,
set one IC as the master and connect the other ICs as shown in the diagram.
T
V
REF
pin.
Master
R
R2
R1
T
OUT
C
R
T
IN
T
pin to the GND pin. If supplying the signal externally, halt the
R
F
V
REF
Slave
R
T
C
V
T
o