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PDF BD9876AEFJ Data sheet ( Hoja de datos )
| Número de pieza | BD9876AEFJ | |
| Descripción | Flexible Step-down Switching Regulators | |
| Fabricantes | ROHM Semiconductor | |
| Logotipo |  |
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Datasheet
Single-chip Type with Built-in FET Switching Regulators
Flexible Step-down
Switching Regulators
with Built-in Power MOSFET
BD9876AEFJ
●General Description
Output 3.0A and belo w High Efficiency Rate Step-down
Switching Re gulator Po wer MOSF ET Internal Type
BD9876AEFJ mainl y used as second ary s ide Po wer
supply, for example from fixed Power supply of 12V, 24V
etc, Step-down Output of 1.2V/1.8V/3.3V/5V, etc, can be
produced. T his IC h as e xternal C oil/Capacitor
down-sizing throu gh 30 0kHz F requency operation,
inside Nch-F ET SW for 45V “ withstand-pressure”
commutation and als o, hig h speed l oad respons e
through Curr ent Mode Control is a s imple e xternal
setting ph ase compensati on sy stem, through a wide
range e xternal const ant, a c ompact Po wer suppl y c an
be produced easily.
●Features
■ Internal 200 mΩ Nch MOSFET
■ Output Current 3A
■ Oscillation Frequency 3 00kHz
■ Synchronizes to External Clock ( 200kHz～
500kHz )
■ Feedback Voltage 1.0V±1.0%
■ Internal Soft Start Function
■ Internal Over Current Protect Circuit,
Low Input Error Prevention Circuit,
Heat Protect Circuit
■ ON/OFF Control through EN Pin
(Standby Current 0 A Typ.)
■ Package: HTSOP-J8 Package
●Typical Application Circuits
●Key Specifications
■ Input Voltage
■ Ref. Precision (Ta=25℃)
■ Max Output Current
■ Operating Temperature
■ Max Junction Temperature
7V to 42V
±1.0%
3A (Max.)
-40℃ to 105 ℃
-55℃ to 150 ℃
●Packages
HTSOP-J8
4.90mm x 6.00mm x 1.00mm
HTSOP-J8
●Applications
■ For Household machines in general that have
12V/24V Lines, etc.
Figure 1. Typical Application Circuit
○Structure：Silicon Monolithic Integrated Circuit ○ This product is not designed for normal operation with in a radioactive.
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・14・001
1/23
TSZ02201-0Q1Q0AJ00170-1-2
http://www.Datasheet4U.com
14.MAR.2014 Rev.005
1 page  
BD9876AEFJ
Datasheet
Over Current Detect Current
Iocp
【CTL】
EN Pin Control voltage
ON VENON
OFF
VENOFF
EN Pin input current
REN
【SYNC】
SYNC Pin Control voltage
High VSYNCH
Low VSYNCL
SYNC Pin input current
REN
SYNC falling edge to LX rising edge delay
◎Not designed to withstand radiation.
tdelay
3.5
2
-0.3
2.7
2.0
-0.3
6
200
6 －A
－ VCC
－ 0.8
5.5 11
V
V
µA VEN=3V
－ 5.5
－
12
400
0.8
24
600
V
V
µA VSYNC=3V
ns
●Operating Ratings(Ta=25℃)
Item S
ymbol
Power Supply Voltage
VCC
Output Voltage
VOUT
(*2)Restricted by minimum on pulse typ. 200ns
Min
7
1.0(*2)
Ratings
Typ
－
－
Max
42
VCC×0.7
Unit
V
V
●Detailed Description
◇Synchronizes to External Clock
The SYNC pin can be used to synchronize the reg ulator to an e xternal system cl ock. To implement the synchronization
feature connect a square wave to SYNC pin. The square wave amplitude must transition lower than 0.8V and higher than
2.0V on the S YNC pin and have an on time greater than 100ns and an off time greater than 100ns. The synchronization
frequency range is 20 0 kHz to 500 k Hz. The rising edge of the LX will be synchronized to the falli ng edge of SYN C pin
signal af ter SYNC input pul se 3 count. At the sy nchronization, the ext ernal clock is removed, the device transiti ons
self-running mode after 7 microseconds.
SYNC
SYNC_LATCH
Lx
Set the latch for
synchronization
400nsec
about
7µsec
Figure 4. Timing chart at Synchronization
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
5/23
TSZ02201-0Q1Q0AJ00170-1-2
14.MAR.2014 Rev.005
5 Page 
BD9876AEFJ
●Example of Reference Application Circuit (Input 24V, Output 5.0V)
Datasheet
Figure 23. Reference Application Circuit
●Reference Application Data (Example of Reference Application Circuit)
100
90
80
70
60
50
40
30
20
10
0
0
VCC=12V
VCC=24V
VCC=36V
VCC=42V
500 1000 1500 2000 2500 3000
LOAD CURRENT[mA]
Figure 24. Electric Power
Conversion Rate
Phase
Gain
Figure 25. Frequency Response
Characteristics (Io=0.5A)
Phase
Gain
Figure 26. Frequency Response
Characteristics (Io=3.0A)
VOUT：200mV/div (AC)
IL：1A/div (DC)
VOUT：200mV/div (AC)
IL：1A/div (DC)
Figure 27. Load Response Characteristics
(Io=0A→3.0A)
Figure 28. Load Response Characteristics
(Io=3.0A→0A)
EN：5V/div (DC)
LX：10V/div (DC
IL：0.5A/div (DC)
VOUT：2V./div (DC)
EN：5V/div (DC)
LX：10V/div (DC
IL：0.5A/div (DC)
VOUT：2V./div (DC)
Figure 29. startup Waveform
www.rohm.com
© 2013 ROHM Co., Ltd. All rights reserved.
TSZ22111・15・001
11/23
Figure 30. Stop Waveform
TSZ02201-0Q1Q0AJ00170-1-2
14.MAR.2014 Rev.005
11 Page | ||
| Páginas | Total 26 Páginas | |
| PDF Descargar | [ Datasheet BD9876AEFJ.PDF ] | |
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