BD7679G Datasheet PDF - Rohm


Part Number BD7679G
Description PWM Control Type DC/DC Converter IC
Page 20 Pages

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PWM Control Type
DC/DC Converter IC for AC/DC Driver
General Description
BD7679G is a PWM controller type DC/DC converter
IC for AC/DC that provides an optimum system for all
products that requires an electrical outlet. This product
supports both isolated and non-isolated devices. IC
enables simple design of low-power electrical
converters. With switching MOSFET and current
detection resistor as external devices, it enables more
freedom in design.
Since the peak current control is utilized, peak current
is controlled in each cycles, application excels wide
bandwidth and transient response.
BD7679G includes various protective functions such
as soft start function, burst function, per-cycle over
current limiter, VCC overvoltage protection and
overload protection.
An external stop pin (COMP pin) is provided, so that
switching stopping can be set by external signals. The
function is available as overheating protection and over
voltage protection of secondary output, so on.
The PWM switching frequency is fixed at 65 kHz.
A frequency hopping function is included which contributes
to low EMI.
Key Specifications
Power Supply Voltage range:
8.5V to 25.0V
Operating Current:
Normal: 0.60mA (Typ)
Burst: 0.40mA (Typ)
Oscillation Frequency:
65kHz (Typ)
Operating Temperature range:
-40°C to +85°C
W(Typ) x D (Typ) x H (Max)
2.90mm x 2.80mm x1.25mm
PWM frequency of 65kHz
PWM current mode method
Low circuit current when UVLO is ON
(12μA at VCC=12V)
Low circuit current without load
(Burst operation when load is light)
Built-in SW frequency hopping function
250ns leading-edge blanking
VCC UVLO / OVP (Auto restart)
Per-cycle over current protection circuit
Soft start
Output overload protection(Auto-restart protection)
External stop function for COMP pin (Auto restart)
AC adapters and household appliances (vacuum cleaners,
humidifiers, air cleaners, air conditioners, refrigerators, IH
cooking heaters, rice cookers, etc.)
Typical Application Circuit
Figure 1, Application Diagram (Isolated type)
Product structureSilicon monolithic integrated circuit
© 2015 ROHM Co., Ltd. All rights reserved.
This product is not designed protection against radioactive rays
2015.4.17 Rev.001

BD7679G datasheet pdf
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