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PDF BD9781HFP Data sheet ( Hoja de datos )

Número de pieza BD9781HFP
Descripción Flexible Step-down Switching Regulators
Fabricantes ROHM Semiconductor 
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Single-chip Type with built-in FET Switching Regulator Series
Flexible Step-down
Switching Regulators
with Built-in Power MOSFET
BD9778F, BD9778HFP, BD9001F, BD9781HFP
No.10027EBT41
Overview
The flexible step-down switching regulator controller is a switching regulator controller designed with a high-withstand-voltage
built-in POWER MOS FET, providing a free setting function of operating frequency with external resistor. This switching regulator
controller features a wide input voltage range (7 V to 35 V or 7 V to 48 V) and operating temperature range (-40˚C to +125˚C or
-40˚C to +95˚C). Furthermore, an external synchronization input pin (BD9781HFP) enables synchronous operation with external
clock.
Features
1) Minimal external components
2) Wide input voltage range: 7 V to 35 V (BD9778F/HFP and BD9781HFP), 7 V to 48 V (BD9001F)
3) Built-in P-ch POWER MOS FET
4) Output voltage setting enabled with external resistor: 1 to VIN
5) Reference voltage accuracy: ±2%
6) Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),
-40˚C to +95˚C (BD9001F)
8) Low dropout: 100% ON Duty cycle
9) Standby mode supply current: 0 µA (Typ.) (BD9778F/HFP and BD9781HFP), 4 µA (Typ.) (BD9001F)
10) Oscillation frequency variable with external resistor: 50 to 300 kHz (BD9001F),
50 to 500 kHz (BD9778F/HFP and BD9781HFP)
11) External synchronization enabled (only on the BD9781HFP)
12) Soft start function : soft start time fixed to 5 ms (Typ.))
13) Built-in overcurrent protection circuit
14) Built-in thermal shutdown protection circuit
15) High power HRP7 package mounted (BD9778HFP and BD9781HFP)
Compact SOP8 package mounted (BD9778F and BD9001F)
Applications
All fields of industrial equipment, such as Flat TV , printer, DVD, car audio, car navigation,
and communication such as ETC, AV, and OA.
Product lineup
Item
Output current
Input range
Oscillation frequency range
External synchronization
Standby function
Operating temperature
Package
BD9778F/HFP
2A
7V ~ 35V
50 ~ 500kHz
Not provided
Provided
-40˚C ~ +125˚C
SOP8 / HRP7
BD9001F
2A
7V ~ 48V
50 ~ 300kHz
Not provided
Provided
-40˚C ~ +95˚C
SOP8
BD9781HFP
4A
7V ~ 35V
50 ~ 500kHz
Provided
Provided
-40˚C ~ +125˚C
HRP7
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1/16
2010.02 - Rev. B

1 page




BD9781HFP pdf
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Technical Note
1.8
1.6
1.4
1.2
1.0
0.8 Ta=125Ŋ
0.6 Ta=25Ŋ
0.4 Ta=-40Ŋ
0.2
0.0
0.0
0.5 1.0 1.5 2.0
OUTPUT CURRENT : IO[A]
2.5
Fig.13 ON resistance VIN=7V (BD9778F/HFP)
1.8
1.6
1.4
1.2
1.0
0.8
Ta=125Ŋ
0.6
Ta=25Ŋ
0.4
Ta=-40Ŋ
0.2
0.0
0.0
0.5 1.0 1.5 2.0
OUTPUT CURRENT : IO[A]
2.5
Fig.14 ON resistance VIN=13.2V (BD9778F/HFP)
1.8
1.6
1.4
1.2
1.0
0.8 Ta=125Ŋ
0.6 Ta=25Ŋ
0.4
Ta=–40Ŋ
0.2
0.0
0
0.5 1 1.5 2
OUTPUT CURRENT : IO[A]
2.5
Fig.15 ON resistance VIN=7V (BD9001F)
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
Ta=125Ŋ
Ta=25Ŋ
Ta=–40Ŋ
0.5 1
1.5 2
OUTPUT CURRENT : IO[A]
2.5
Fig.16 ON resistance VIN=13.2V
(BD9001F)
100
90 5V output
80
70
3.3V output
2.5V output
60
50
40
30
20
10
0
0.0 0.5 1.0 1.5 2.0 2.5
OUTPUT CURRENT : IO[A]
3.0
Fig.17 IO vs Efficiency(VIN=12V,f=200kHz)
ý(BD9781HFP)
100 5V output 3.3V output
90
80
70
60 2.5V output
50 1.5V output
40
30
20
10
0
0 0.5 1.0 1.5 2.0
OUTPUT CURRENT : IO[A]
Fig.18 IO vs Efficiency(VIN=12V,f=100kHz)
ý(BD9778F/HFP)
100
66
90 5V output
Ta=25Ŋ Ta=-40Ŋ
Ta=25Ŋ
Ta=-40Ŋ
80 5 5
70 3.3V output
60
2.5V output
4
Ta=125Ŋ
4 Ta=125Ŋ
50 3 3
40
30 2 2
20
10 1 1
0
0 0.4 0.8 1.2 1.6 2
OUTPUT CURRENT : IO[A]
0
01 2 34 5 67
OUTPUT CURRENT : IO[A]
0
0 1 2 34 5
OUTPUT CURRENT : IO[A]
Fig.19 IO vs Efficiency(VIN=12V,f=100kHz) Fig.20 Current capacitance(VIN=12V,Vo=5V,f=100kHz) Fig.21 Current capacitance(VIN=12V,Vo=5V,f=100kHz)
ý(BD9001F)
(BD9781HFP)
(BD9778F/HFP)
6
Ta=25Ŋ
Ta=-40Ŋ
5
4
Ta=125Ŋ
3
2
1
0
01
2 34
5
OUTPUT CURRENT : IO[A]
Fig.22 Current capacitance(VIN=12V,Vo=5V,f=100kHz)
(BD9001F)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
5/16
2010.02 - Rev. B

5 Page





BD9781HFP arduino
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Technical Note
Di
L
C3
Co R1
Cx2
R2
C
C
Di
L
RT
CT Cx1
Co
Fig.32 BD9001F reference layout pattern
Ţ As shown above, design the GND pattern as large area as possible
within inner layer.
Ţ Gray zones indicate GND.
500
450
400
350
300
250
200
150
100
50
0 100 200 300 400 500 600 700 800
OSCILATING FREQUENCY SETTING RESISTANCE : RT[kΩ]
Fig.34 RT vs fOSC (BD9781HFP/BD9778F/HFP)
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mqagjj_rgmldpcosclawgqlcacqq_pwrmamlqgbcpĺ0.#_qbgqncpqgml,
Phase compensation setting procedure
1. Application stability conditions
Fig.33 BD9781HFP reference layout pattern
300
250
200
150
100
50
50 100 200 300 400 500 600 700 800
OSCILATING FREQUENCY SETTING RESISTANCE : RT [kΩ]
Fig.35 RT vs fOSC &BD9001F'
The following section describes the stability conditions of the negative feedback system.
Since the DC/DC converter application is sampled according to the switching frequency, GBW (frequency at 0-dB gain)
of the overall system should be set to 1/10 or less of the switching frequency. The following section summarizes the targeted
characteristics of this application.
Ă At a 1 (0-dB) gain, the phase delay is 150˚ or less (i.e., the phase margin is 30˚ or more).
Ă The GBW for this occasion is 1/10 or less of the switching frequency.
Responsiveness is determined with restrictions on the GBW. To improve responsiveness, higher switching frequency
should be provided.
Replace a secondary phase delay (-180˚) with a secondary phase lead by inserting two phase leads, to ensure the stability
through the phase compensation. Furthermore, the GBW (i.e., frequency at 0-dB gain) is determined according to phase
compensation capacitance provided for the error amplifier. Consequently, in order to reduce the GBW,
increase the capacitance value.
(1) Typical integrator (Low pass filter)
(2) Open loop characteristics of integrator
Feedback R
FB
A
-
C
Gain
[dB]
A
0
0
Phase
[˚] -90
-180
(a)
-20dB/decade
GBW(b)
-90˚
Phase
margin
-180˚
f
f
Since the error amplifier is provided with (1) or (2) phase compensation, the low pass filter is applied. In the case of
the DC/DC converter application, the R becomes a parallel resistance of the feedback resistance.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
11/16
2010.02 - Rev. B

11 Page







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