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PDF BD7673AG Data sheet ( Hoja de datos )
| Número de pieza | BD7673AG | |
| Descripción | DC/DC Converter IC | |
| Fabricantes | ROHM Semiconductor | |
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Datasheet
PWM Control Type
DC/DC Converter IC for AC/DC Driver
BD7673AG
●General Description
BD7673AG is a PWM controller type DC/DC converter
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 cycle, application excels wide
bandwidth and transient response.
BD7673AG includes various protective functions such
as soft start function, burst function, per-cycle over
current limiter, VCC overvoltage protection and
overload protection.
An external latch pin (COMP pin) is provided, so that
latch stopping (OFF) can be set by external signals.
This function is available as overheating protection and
over output voltage protection.
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
■ 250nsec leading-edge blanking
■ VCC UVLO / OVP
■ Per-cycle over current protection circuit
■ Soft start
■ Output overload protection (latch protection)
■ External latch function for COMP pin
(Over heating protection function)
●Applications
AC adapters and household appliances (vacuum cleaners,
humidifiers, air cleaners, air conditioners, refrigerators, IH
cooking heaters, rice cookers, etc.)
●Typical Application Circuit
F1
ZNR1
FL1
C8
C9
F2
D1 R1
+ C1
Q1
R5
77667733A
C2 R2
D2
R4 D3
+
C3
ZD
C4 R3
R11
D4
+ C5
R6
C7
U1 R7
R9
C6 R8
U2
R10
Figure 1, Application Diagram (12 V 1A Isolated Type)
○Product structure：Silicon monolithic integrated circuit
.www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
○This product is not designed protection against radioactive rays
1/17
TSZ02201-0F2F0A200120-1-2
16.Jul.2015 Rev.002
1 page  
BD7673AG
Datasheet
( 2 ) VCC Pin Protection
BD7673AG includes UVLO (Under Voltage Locked Out) and OVP (Over Voltage Protection) functions to monitor VCC pin
voltage (see Figure 6 for OVP latch operation).
The UVLO function prevents damage to MOSFET by stopping switching operations by latch protection 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).
The latch release condition is when VCC < VLATCH (VUVLO2 - 0.5V, Typ = 7.0V). A latch blanking time is used for protecting
mal-function. This time is 100us.
VCC
27. 5V
13. 5V
7. 5V
7. 0V
OUT
Time
Switing
OFF
ON
OFF
100 us
ON
Time
Figure 6, VCC UVLO/OVP Operation (Latch)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/17
TSZ02201-0F2F0A200120-1-2
16.Jul.2015 Rev.002
5 Page 
BD7673AG
Datasheet
●Typical Performance Curves
(This is not a guarantee since this is the reference data. Figure 37 shows the measurement circuit diagram.)
70.0
68.0
66.0
64.0
62.0
60.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 13, Typ Frequency Fsw1
85.0
83.0
81.0
79.0
77.0
75.0
73.0
71.0
69.0
67.0
65.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 14, MAXDUTY1 (With Typ frequency)
25.0
23.0
21.0
19.0
17.0
15.0
13.0
11.0
9.0
7.0
5.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 15, MAXDUTY2 (With Typ frequency）
35.0
33.0
31.0
29.0
27.0
25.0
23.0
21.0
19.0
17.0
15.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 16, MAXDUTY3 (With Typ frequency）
1.40
1.30
1.20
1.10
1.00
0.90
0.80
0.70
0.60
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 17, MAXDUTY SS1 (VCC=15）
10.8
10.3
9.8
9.3
8.8
8.3
7.8
7.3
6.8
6.3
5.8
5.3
4.8
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 18, MAXDUTY SS2 (VCC=15)
12.0
11.0
10.0
9.0
8.0
7.0
6.0
5.0
4.0
3.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 19, NMOS RON (VCC=12)
37.0
34.0
31.0
28.0
25.0
22.0
19.0
16.0
13.0
10.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 20, PMOS RON (VCC=12)
200.0
175.0
150.0
125.0
100.0
75.0
50.0
-40 -25 -10 5 20 35 50 65
Temp[℃ ]
Figure 21, Timer Latch
80
20.0
25.0
3.10
15.0
10.0
5.0
23.0
21.0
19.0
17.0
2.90
2.70
0.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
15.0
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
2.50
-40 -25 -10 5 20 35 50 65 80
Temp[℃ ]
Figure 22, ICC (VCC) OFF (VCC=12)
Figure 23, FBRES (VCC=12)
Figure 24, FBOLP Voltage 1a (VCC=12)
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/17
TSZ02201-0F2F0A200120-1-2
16.Jul.2015 Rev.002
11 Page | ||
| Páginas | Total 21 Páginas | |
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