BD8325FVT-M Datasheet, PDF (1/34 Pages) Rohm – Built-in Secondary-side Driver

Isolated DC/DC controller IC
Built-in Secondary-side Driver
with Synchronous Rectification
Active Clamp PWM Controller
BD8325FVT-M
●General Description
BD8325FVT-M is a PWM controller intended for Active
clamp, current-mode isolated switching regulator.
This controller provides control outputs for driving
primary-side MOSFET, and outputs with adjustable delay,
which can be used for driving synchronous rectifier
MOSFET on the secondary-side.
Its maximum input voltage is 20V. External startup
regulator can be set at high voltage.
●Applications
■ High efficiency/ large current isolated DC/DC
(VINmax=100V)
■ Cellular base station
■ Industrial power supplies
■ Car application
■ 10W to 700W SMPS
●Package
TSSOP-B30
W(Typ) x D(Typ) x H(Max)
10.00mm x 7.60mm x 1.00mm
●Typical Application Circuits
VLINE
●Features
■ Ideal for Active Clamp /Rest Forward/Flyback
converter
■ Current-mode Control with Dual Mode Over-Current
Protection
■ Synchronization to External Clock
■ Programmable Dead-Time (Turn-On/Turn-Off)
between MAIN and AUX MOSFET by External
Resistor
■ Have Control Outputs for Driving Primary Side
MOSFET; Have Outputs with Adjustable Time for
Driving Synchronous Rectifier MOSFET in
Secondary Side (OUT2F, OUT2R pin)
■ Programmable Oscillator Frequency and Maximum
Duty Cycle by External Resistor
■ Programmable Soft-Start Time by External
Capacitor
■ Programmable Slope Compensation by External
Resistor
■ A Variety of Protection
First Over-Current Protection (Pulse-by-Pulse mode)
Second Over-Current Protection (HICCUP mode)
VCC_UVLO (Input Under-Voltage Protection)
LINE_UVLO (Line Under-Voltage Protection)
VOUT
Wake
up
REG
CS
VCC/VDD
LINEUV
VREF
AUX
SS
FB
SAWH
RTON
OUT
RTOFF
RDELON
RDELOFF ^OUT2F
RDELSLF
RDELSLR1
RDELSLR2 OUT2R
CLKOUT
SYNC
GND
PGND
REG
ERROR
AMP
Fig.1 Typical Application Circuit
○Structure：Silicon Monolithic Integrated Circuit ○This product has no designed protection against radioactive rays.
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TSZ02201-0Q3Q0AJ83250-1-2
2013.11.22 Rev.002