bd9763fvm ROHM Co. Ltd., bd9763fvm Datasheet - Page 5

• Manufacturer Part Number: bd9763fvm
• Description: Single-output Step-up, High-efficiency Switching Regulators Controller Type
• Manufacturer: ROHM Co. Ltd.

●Block description
●Application example
・VOLTAGE REFERENCE(VREF) BLOCK
・OSCILLATOR BLOCK
・PWM COMP
・ERROR AMP BLOCK
・PROTECTION CIRCUIT BLOCK
This voltage reference block generates 2.5V internal reference voltage.
Oscillator block sets the oscillating frequency adjusted by an external resistance in RT pin. The oscillating
frequency can be set within a range of 100~1200kHz.. (See the description of how to set the frequency on page6.)
The PWM comparator transforms the voltage outputted from error amp to PWM waveform and outputs to FET driver.
The maximum duty cycle is limited up to 90%.
The error amp block detects the output voltage from the INV pin, amplifies the difference between the detected voltage
and the reference voltage, and outputs it to FB pin. The reference voltage is 1V±2%.
The under voltage lock out circuit is activated to shut down the whole circuit when the VCC voltage is up to 3.8V.
When the thermal shutdown circuit detects abnormal heating of the chip (150℃), the output becomes off.
And the output turns back on when the chip temperature goes down to a specific level.
VOUT
VCC
1μF
C1
C2
＊
＊
VCC
OUT
GND
VREF
5/12
CTL/SS
INV
FB
RT
R1
＊RRT
R2
H:OFF
L:ON
ON/OFF