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BD9853AFV 데이터시트 PDF




ROHM Semiconductor에서 제조한 전자 부품 BD9853AFV은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


 

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부품번호 BD9853AFV 기능
기능 Single/Dual-output High-frequency Step-down Switching Regulator
제조업체 ROHM Semiconductor
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BD9853AFV 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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BD9853AFV 데이터시트, 핀배열, 회로
Large Current External FET Controller Type Switching Regulators
Single/Dual-output High-frequency
Step-downSwitchingRegulator(Controllertype)
BD9853AFV
No.09028EAT05
Description
The BD9853AFV is a 2-ch synchronous DC/DC controller that can operate at a maximum switching frequency of 2MHz,
enabling the use of a smaller external coil than conventional lower-frequency switching regulators. This makes the
BD9853AFV a suitable choice for downsizing applications.
Features
1) Synchronous Switching Regulator Controller 2channels
2) FET(Pch/Nch) Direct Drive
3) Adjustable Oscillator Frequency with External Resistor (Max. 2MHz)
4) Under Voltage Lockout Function (UVLO)
5) Thermal Shut Down Function (TSD)
6) Short Circuit Protection (SCP)
7) Independent ON/OFF Function in Each Channel with Soft Start Pin
8) SSOP-B16 Package
SSOPB16
Applications
TVSTB, PC, Portable CDDVD,DVC etc.
Absolute Maximum Ratings (Ta = 25)
Parameter
Symbol
Limits
Unit
Supply Voltage (VCC-GND)
Vcc
18
VREGA-GND Voltage
VREGA
7
VCC-VREGB Voltage
VREGB
7
Power Dissipation
Pd 562(*1)
Operating Temperature Range
Topr
-40 to +85
Junction Temperature
Tjmax
+150
Storage Temperature Range
Tstg -55 to +150
* Reduced by 4.49mW for each increase in Ta of 1over 25(When mounted on a board 70×70×1.6tmm grass-epoxy PCB)
V
V
V
mW
Recommended Operating Conditions
Parameter
Supply Voltage
Oscillator Frequency
Limits
Symbol
Min. Typ. Max.
Vcc 4.5 12 16
fosc
100
1000
2000
Unit
V
KHz
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
1/16
2009.05 - Rev.A




BD9853AFV pdf, 반도체, 판매, 대치품
BD9853AFV
Technical Note
Characteristic Data
100
90
80
70
OUTL
60
50
40
30 OUTH
20
10
0
1.3 1.4 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.5 2.6
FB VOLTAGE:VFB[V]
180
160
140
120
100
80
60
40
20
0
-20
-40
-60
-80
-100
-120
-140
-160
-180
0.01
0.1
Phase
Gain
1 10 100 1000
FREQUENCY[KHz]
10000 100000
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4
FB VOLTAGE[V]
Fig.1 FB VOLTAGE VS ON DUTY
Fig.2 ERROR AMP OPEN LOOP
Fig.3 FB SINK CURRENT
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
-11
-12
-13
-14
-15
-16
-17
-18
-19
-20
0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 3.2 3.4 3.6 3.8 4 4.2 4.4
FB VOLTAGE[V]
1000
950
900
850
800
750
700
650
600 VCC=12V,18V
550
500
450
400
350
4
300
250
200
150 VCC=4.5V
100
50
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
(REGB-OUTH) VOLTAGE[V]
Fig.4 FB SOURCE CURRENT
Fig.5 OUTH SINK CURRENT
1000
950
900
850
800
750
700
650
600
550
500
450
VCC=12V,18V
400
350
300
250
200 VCC=4.5V
150
100
50
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
(VCC-OUTH) VOLTAGE:[V]
Fig.6 OUTH SOURCE CURRENT
1000
950
900
850
800
750
700
650
600
550 VCC=12V,18V
500
450
400
350
300
250
200
150
VCC=4.5V
100
50
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
(OUTL-GND) VOLTAGE[V]
1000
950
900
850
800
750
700
650 VCC=12V,18V
600
550
500
450
400
350
300
250
VCC=4.5V
200
150
100
50
0
0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
(REGA-OUTL) VOLTAGE[V]
Fig.7 OUTL SINK CURRENT
Fig.8 OUTL SOURCE CURRENT
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
4/16
2009.05 - Rev.A

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BD9853AFV 전자부품, 판매, 대치품
BD9853AFV
Technical Note
Block functional descriptions
Triangular wave oscillator
Connecting the resistor that sets the triangular wave oscillation frequency at the RT terminal generates the triangular wave,
which is input into the CH1 and CH2 PWM comparator.
Error amp
The INV pin detects the output voltage, compares it to the programmed output voltage and amplifies the difference for
output by the FB pin. (The 0.8V reference is the comparison voltage. The tolerance is 1.25%.)
PWM comparator
The PWM comparator converts the error amp (FB) voltage into a pulse width modulated waveform that goes to the FET
driver and turns FET output ON.
FET driver
The push-pull FET driver directly drives the external MOSFET,providing high-side(OUT1H,OUT2H) switching at voltages
between VccREGB, and low-side switching in the 0REGA voltage range. (REGA = 5V; REGB= VCC -5V internal power)
Standby function
The standby function enables output ON/OFF control by the STB pin. Output is ON when STB voltage is HIGH.
With the STB pin set HIGH, the output ON/OFF for each channel can be independently controlled by one of the
SCP/SOFT1, 2 pins.
Soft Start/Short Circuit Protection (SCP)
Connecting the external capacitor on the SCP/SOFT1, 2 pins sets the SCP delay time and soft start time.
When STB is HIGH and the IC starts up, the capacitors on the SCP/SOFT1, 2 pins charge up at 2uA, stabilizing when the
system reaches 1.3V.
If load conditions change rapidly, causing the output voltage in either channel to fall to 70% or less of the set output voltage
(INV voltage 0.56 or lower), the SCP/SOFT1, 2 external capacitors will charge further until output for both channels
switches OFF at 2.3V.
Under Voltage Lockout (UVLO)
Under Voltage lockout prevents IC malfunctions that could otherwise occur due to intermittent or fluctuating power supply
voltage, or insufficient voltage during start-up.When the VCC voltage falls to 4.1V or below, both channel outputs are
turned OFF, while the SCP/SOFT1, 2 pins are simultaneously set LOW.
The UVLO detection voltage includes 0.1V hysteresis width to prevent malfunctions from input voltage fluctuations.
Thermal Shutdown (TSD)
The TSD circuit protects the IC against thermal runaway and heat damage.
The TSD thermal sensor detects junction temperature. When the temperature reaches the TSD threshold (175), the
circuit switches the output of both channels OFF, and also switches REGA and REGB OFF. At the same time, it sets the
SCP/SOFT1, 2 pins LOW. The hysteresis width (15) provided between the TSD function start temperature (threshold)
and the stop temperature serves to prevent malfunctions from temperature fluctuations.
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
7/16
2009.05 - Rev.A

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부품번호상세설명 및 기능제조사
BD9853AFV

Single/Dual-output High-frequency Step-down Switching Regulator

ROHM Semiconductor
ROHM Semiconductor

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