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PDF BD7679G Data sheet ( Hoja de datos )
| Número de pieza | BD7679G | |
| Descripción | PWM Control Type DC/DC Converter IC | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
PWM Control Type
DC/DC Converter IC for AC/DC Driver
BD7679G
●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
●Package
SSOP6
W(Typ) x D (Typ) x H (Max)
2.90mm x 2.80mm x1.25mm
●Features
■ 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)
●Applications
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 structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/17
TSZ02201-0F2F0A200160-1-2
2015.4.17 Rev.001
1 page  
BD7679G
Datasheet
( 2 ) VCC Pin Protection
BD7679G includes UVLO (Under Voltage Locked Out) and OVP (Over Voltage Protection) functions to monitor VCC pin
voltage (see Figure 6 for OVP auto-restart operation).
The UVLO function prevents damage to MOSFET by stopping switching operations when the VCC pin voltage drops to VCC
< VUVLO2 (= 7.5V Typ).
The VCC OVP function prevents damage to MOSFET by stopping switching operations when the VCC pin voltage exceeds
VOVP1 (= 27.5V Typ). Once the switching is stopped, IC stops switching until VCC < VOVP2(=22.5V Typ).
A blanking time of TSTOP(=100us.Typ) is prepared for protecting mal-function.
VCC
27.5V
22.5V
13.5V
7 .5 V
Time
SW
ON
OFF OFF
ON
ON
Figure 6, VCC UVLO/OVP Operation (Auto-restart)
Time
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/17
TSZ02201-0F2F0A200160-1-2
2015.4.17 Rev.001
5 Page 
BD7679G
Datasheet
0.53
0.52
0.51
0.50
0.49
0.48
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 23, CURLIM Voltage (VCC=12)
0.530
0.525
0.520
0.515
0.510
0.505
0.500
0.495
0.490
0.485
0.480
8.5 14.0 19.5 25.0
VCC[V]
Figure 26, CURLIM Voltage (temp=25℃)
0.40
0.35
0.30
0.25
0.20
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 24, FB Burst Voltage (VCC=12)
70.0
68.0
66.0
64.0
62.0
60.0
8.5 14.0 19.5 25.0
VCC[V]
Figure 25, Frequency Fsw1 (temp=25℃)
BD7679G
GND
VCC
FB OUT
AA
COMP
CS
A
Figure 27, Measurement Circuit Diagram
www.rohm.com
© 2015 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/17
TSZ02201-0F2F0A200160-1-2
2015.4.17 Rev.001
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet BD7679G.PDF ] | |
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