BD9778F, BD9778HFP, BD9001F, BD9781HFP : Power

Rcaflga_jLmrc
R
caflga_jL
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)
2)
3)
4)
5)
6)
8)
9)
10)
11)
12)
13)
14)
15)
Minimal external components
Wide input voltage range: 7 V to 35 V (BD9778F/HFP and BD9781HFP), 7 V to 48 V (BD9001F)
Built-in P-ch POWER MOS FET
Output voltage setting enabled with external resistor: 1 to VIN
Reference voltage accuracy: ±2%
Wide operating temperature range: -40˚C to +125˚C (BD9778F/HFP and BD9781HFP),
-40˚C to +95˚C (BD9001F)
Low dropout: 100% ON Duty cycle
Standby mode supply current: 0 µA (Typ.) (BD9778F/HFP and BD9781HFP), 4 µA (Typ.) (BD9001F)
Oscillation frequency variable with external resistor: 50 to 300 kHz (BD9001F),
50 to 500 kHz (BD9778F/HFP and BD9781HFP)
External synchronization enabled (only on the BD9781HFP)
Soft start function : soft start time fixed to 5 ms (Typ.))
Built-in overcurrent protection circuit
Built-in thermal shutdown protection circuit
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
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
BD9001F
2A
7V ~ 48V
50 ~ 300kHz
Not provided
Provided
-40˚C ~ +95˚C
SOP8
1/16
BD9781HFP
4A
7V ~ 35V
50 ~ 500kHz
Provided
Provided
-40˚C ~ +125˚C
HRP7
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Absolute Maximum Ratings(Ta = 25˚C)
Parameter
BD9778F/HFP,BD9781HFP
Power supply
BD9001F
voltage
Output switch pin voltage
Output switch current
Limits
36
50
VIN
2
4
VIN
7
5.5
0.69
-40 ~ +125
-40 ~ +95
-55 ~ +150
150
VIN
VSW
BD9778F/HFP, BD9001F
BD9781HFP
ISW
VEN/SYNC,VEN
VRT,VFB,VINV
EN/SYNC, EN pin voltage
RT, FB, INV pin voltage
Power dissipation
Symbol
HRP7
Pd
SOP8
Operating temperature BD9778F/HFP,BD9781HFP
range
BD9001F
Storage temperature range
Maximum junction temperature
Topr
Tstg
Tjmax
Unit
V
V
*1
*1
A
V
*2
*3
W
˚C
˚C
˚C
*1 Should not exceed Pd-value.
*2 Reduce by 44mW/°C over 25°C, when mounted on 2-layer PCB of 70 X 70 X 1.6 mm3.
(PCB incorporates thermal via. Copper foil area on the front side of PCB: 10.5 X 10.5 mm2. Copper foil area on the reverse side of PCB: 70 X 70 mm2)
*3 Reduce by 5.52 mW/°C over 25°C, when mounted on 2-layer PCB of 70 X 70 X 1.6 mm3.
Recommended operating range
Parameter
Operating power supply voltage
Output switch current
Output voltage (ON Duty)
Oscillation frequency
Oscillation frequency set resistance
BD9778F/HFP
7 ~ 35
~2
6 ~ 100
50 ~ 500
40 ~ 800
BD9001F
7 ~ 48
~2
6 ~ 100
50 ~ 300
100 ~ 800
BD9781HFP
7 ~ 35
~4
6 ~ 100
50 ~ 500
39 ~ 800
Unit
V
A
%
kHz
kΩ
BD9778F/HFP
5 ~ 35
BD9001F
7 ~ 48
BD9781HFP
5 ~ 35
Unit
V
Possible operating range
Parameter
Operating power supply voltage
Electrical characteristics
BD9778F/HFP (Unless otherwise specified, Ta = -40˚C to +125˚C, VIN =13.2 V, VEN = 5 V)
Parameter
Symbol
ISTB
Standby circuit current
IQ
Circuit current
[SW block]
RON
POWER MOS FET ON resistance
IOLIMIT
Operating output current of overcurrent protection
IOLEAK
Output leak current
[Error Amp block]
VREF1
Reference voltage 1
VREF2
Reference voltage 2
∆VREF
Reference voltage input regulation
IB
Input bias current
VFBH
Maximum FB voltage
VFBL
Minimum FB voltage
IFBSINK
FB sink current
IFBSOURCE
FB source current
TSS
Soft start time
[Oscillator block]
FOSC
Oscillation frequency
∆FOSC
Frequency input regulation
[Enable block]
VEN
Threshold voltage
IEN
Sink current
Min.
-
Limits
Typ. Max.
0
10
3
4.2
Unit
Condition
µA
mA
VEN=0V,Ta=25˚C
IO=0A
2
-
0.53
4
0
0.9
30
Ω
A
µA
ISW=50mA
* Design assurance
VIN=35V,VEN=0V
0.98
0.96
-1
2.4
-5.0
70
-
1.00
1.00
0.5
2.5
0.05
-3.0
120
5
1.02
1.04
0.10
-0.5
170
-
V
V
%
µA
V
V
mA
µA
mS
VFB=VINV,Ta=25˚C
VFB=VINV
VIN=5 ~ 35V
VINV=1.1V
VINV=0.5V
VINV=1.5V
VFB=1.5V,VINV=1.5V
VFB=1.5V,VINV=0.5V
* Design assurance
82
-
102
1
122
-
kHz
%
RT=390kΩ
VIN=5 ~ 35V
0.8
-
1.7
13
2.6
50
V
µA
VEN=5V
* Not designed to be radiation-resistant.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
2/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
BD9001F (Unless otherwise specified, Ta=-40˚C ~ +95˚C,VIN=13.2V, VEN=5V)
Parameter
Symbol
Standby circuit current
ISTB
IQ
Circuit current
[SW block]
RON
POWER MOS FET ON resistance
IOLIMIT
Operating output current of overcurrent protection
[Error Amp block]
VREF1
Reference voltage 1
VREF2
Reference voltage 2
∆VREF
Reference voltage input regulation
IB
Input bias current
VFBH
Maximum FB voltage
VFBL
Minimum FB voltage
IFBSINK
FB sink current
IFBSOURCE
FB source current
Soft start time
Tss
[Oscillator block]
FOSC
Oscillation frequency
∆FOSC
Frequency input regulation
[Enable block]
VEN
Threshold voltage
IEN
Sink current
Min.
-
Limits
Typ. Max.
4
10
3
4.2
Unit
µA
mA
Condition
VEN=0V,Ta=25˚C
IO=0A
2.5
0.6
4
1.2
-
Ω
A
ISW=50mA
* Design assurance
0.98
0.96
-1
2.4
-5.0
70
-
1.00
1.00
0.5
2.5
0.05
-3.0
120
5
1.02
1.04
0.10
-0.5
170
-
V
V
%
µA
V
V
mA
µA
ms
VFB=VINV,Ta=25˚C
VFB=VINV
VIN=7 ~ 48V
VINV=1.1V
VINV=0.5V
VINV=1.5V
VFB=1.5V,VINV=1.5V
VFB=1.5V,VINV=0.5V
* Design assurance
82
-
102
2
122
-
kHz
%
RT=390kΩ
VIN=7 ~ 48V
0.8
-
1.7
13
2.6
50
V
µA
VEN =5V
* Not designed to be radiation-resistant.
BD9781HFP (Unless otherwise specified, Ta=-40˚C ~ +125˚C,VIN=13.2V,VEN/SYNC=5V)
Parameter
Symbol
ISTB
Standby circuit current
IQ
Circuit current
[SW block]
RON
POWER MOS FET ON resistance
IOLIMIT
Operating output current of overcurrent protection
IOLEAK
Output leak current
[Error Amp block]
Reference voltage1
VREF1
VREF2
Reference voltage2
∆VREF
Reference voltage input regulation
IB
Input bias current
VFBH
Maximum FB voltage
VFBL
Minimum FB voltage
IFBSINK
FB sink current
IFBSOURCE
FB source current
TSS
Soft start time
[Oscillator block]
FOSC
Oscillation frequency
∆FOSC
Frequency input regulation
[Enable/Synchronizing input block]
VEN/SYNC
Threshold voltage
IEN/SYNC
Sink current
FSYNC
External synchronizing frequency
Min.
-
Limits
Typ. Max.
0
10
8
3
Unit
Condition
µA
mA
VEN/SYNC=0V,Ta=25ºC
IO=0A
4
-
0.5
8
0
0.9
30
Ω
A
µA
ISW=50mA
* Design assurance
VIN=35V,VEN/SYNC=0V
0.98
0.97
-1
2.4
-5.0
70
-
1.00
1.00
0.5
2.5
0.05
-3.0
120
5
1.02
1.03
0.10
-0.5
170
-
V
V
%
µA
V
V
mA
µA
mS
VFB=VINV,Ta=25ºC
VFB=VINV
VIN=5 ~ 35V
VINV=1.1V
VINV=0.5V
VINV=1.5V
VFB=1.5V,VINV=1.5V
VFB=1.5V,VINV=0.5V
* Design assurance
82
-
102
1
122
-
kHz
%
RT=390kΩ
VIN=5 ~ 35V
0.8
-
1.7
35
150
2.6
90
-
V
µA
kHz
VEN/SYNC=5V
FEN/SYNC=150kHz
* Not designed to be radiation-resistant.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
3/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Reference data
1.010
1.005
1.000
0.995
0.990
0.985
-25
0
25
50
75
100
10
39kΩ
500
400
91kΩ
300
200
390kΩ
100
910kΩ
0
-50
125
Fig.1 Output reference voltage vs.
Ambient temprature(All series)
25
50
75
7
6
125Ŋ
5
VCC=12V
Istb=0.14µA
4
3
2
1
0
100 125
25Ŋ
0
5
10
15
20
25
-40Ŋ
30
35
40
INPUT VOLTAGE : VIN[V]
Fig.2 Frequency vs. Ambient
temperature(All series)
Fig.3 Standby current(BD9781HFP)
40
10
4
STAND-BY CURRENT : ISTB[µA]
8
7
6
125Ŋ
5
VCC=12V
Istb=0.14µA
4
3
2
1
25Ŋ
30
25Ŋ
–40Ŋ
20
10
CIRCUIT CURRENT : ICC[mA]
125Ŋ
9
STAND-BY CURRENT : ISTB[µA]
0
8
AMBIENT TEMPERATURE : Ta[Ŋ]
AMBIENT TEMPERATURE : Ta[Ŋ]
0
-25
9
STAND-BY CURRENT : ISTB[µA]
1.015
0.980
-50
600
OSCILLATING FREQUENCY : fosc[kHz]
REFERENCE VOLTAGE : VREF[V]
1.020
2
1
-40Ŋ
0
0
5
Dpmkrfcrmn* -40Ŋ
25Ŋ
125Ŋ
3
10 15 20 25 30
INPUT VOLTAGE : VIN[V]
35
0
40
Fig.4 Standby current(BD9778F/HFP)
10
20
30
40
50
60
5
10
15
20
25
30
35
40
INPUT VOLTAGE : VIN[V]
Fig.5 Standby current(BD9001F)
Fig.6 Circuit current(BD9781HFP)
1.8
4
4
0
INPUT VOLTAGE : VIN[V]
2
1
0
0
5
10 15 20 25 30
INPUT VOLTAGE : VIN[V]
35
3
Dpmkrfcrmn* 125Ŋ
-40Ŋ
25Ŋ
2
1
0
40
20
30
40
50
INPUT VOLTAGE : VIN[V]
1.4
1.2
1.0
0.4
0.2
Fig.9 ON resistance VIN=5V(BD9781HFP)
1.6
1.2
1.0
0.8
Ta=125Ŋ
Ta=25Ŋ
0.6
0.4
Ta=-40Ŋ
0.2
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT : IO[A]
Fig.10 ON resistance VIN=7V (BD9781HFP)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
1.2
1.0
0.8
Ta=25Ŋ
0.6
Ta=125Ŋ
0.4
Ta=-40Ŋ
0.2
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
FET ON RESISTANCE : RON[Ω]
1.8
1.6
FET ON RESISTANCE : RON[Ω]
1.8
1.6
1.4
Ta=25Ŋ
Ta=-40Ŋ
0.6
1.8
1.4
Ta=125Ŋ
0.8
0.0
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
OUTPUT CURRENT : IO[A]
60
Fig.8 Circuit current(BD9001F)
Fig.7 Circuit current(BD9778F/HFP)
FET ON RESISTANCE : RON[Ω]
10
FET ON RESISTANCE : RON[Ω]
CIRCUIT CURRENT : ICC[mA]
CIRCUIT CURRENT : ICC[mA]
1.6
Dpmkrfcrmn* -40Ŋ
25Ŋ
125Ŋ
3
1.4
1.2
Ta=125Ŋ
1.0
Ta=25Ŋ
0.8
Ta=-40Ŋ
0.6
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
2.5
OUTPUT CURRENT : IO[A]
OUTPUT CURRENT : IO[A]
Fig.11 ON resistanceVIN=13.2V (BD9781HFP)
Fig.12 ON resistance VIN=5V (BD9778F/HFP)
4/16
2010.02 - Rev. B
Technical Note
1.8
1.6
1.6
1.6
1.2
1.0
0.8
Ta=125Ŋ
0.6
Ta=25Ŋ
Ta=-40Ŋ
0.4
0.2
0.0
0.0
0.5
1.0
1.5
2.0
OUTPUT CURRENT : IO[A]
1.0
0.8
Ta=125Ŋ
0.6
Ta=25Ŋ
0.4
100
1.6
90
1.2
Ta=125Ŋ
1.0
Ta=25Ŋ
0.8
0.6
Ta=–40Ŋ
0.4
0.2
0.0
0.5
1
1.5
2
OUTPUT CURRENT : IO[A]
0.8
Ta=125Ŋ
0.6
Ta=25Ŋ
0.4
Ta=–40Ŋ
0.2
0
80
3.3V output
70
2.5V output
60
50
40
30
20
0.5
1
1.5
2
OUTPUT CURRENT : IO[A]
2.5
Fig.15 ON resistance VIN=7V (BD9001F)
5V output 3.3V output
90
80
70
60
2.5V output
1.5V output
50
40
30
20
10
0.5
1.0
1.5
2.0
2.5
OUTPUT CURRENT : IO[A]
0
3.0
0
1.5
0.5
1.0
OUTPUT CURRENT : IO[A]
2.0
Fig.16 ON resistance VIN=13.2V
Fig.17 IO vs Efficiency(VIN=12V,f=200kHz)
Fig.18 IO vs Efficiency(VIN=12V,f=100kHz)
(BD9001F)
ý(BD9781HFP)
ý(BD9778F/HFP)
100
6
6
5V output
90
Ta=25Ŋ
80
OUTPUT VOLTAGE : VO[V]
CONVERSION EFFICIENCY [%]
1.0
100
5V output
0
0.0
2.5
1.2
2.5
10
0
1.4
0.0
0.5
1.0
1.5
2.0
OUTPUT CURRENT : IO[A]
Fig.14 ON resistance VIN=13.2V (BD9778F/HFP)
1.8
1.4
Ta=-40Ŋ
0.2
3.3V output
70
2.5V output
60
50
40
30
20
10
0
0
0.4
0.8
1.2
1.6
OUTPUT CURRENT : IO[A]
2
Ta=25Ŋ
Ta=-40Ŋ
5
5
OUTPUT VOLTAGE : VO[V]
FET ON RESISTANCE : RON[Ω]
1.2
0.0
0.0
2.5
Fig.13 ON resistance VIN=7V (BD9778F/HFP)
1.4
CONVERSION EFFICIENCY [%]
1.4
FET ON RESISTANCE : RON[Ω]
1.8
FET ON RESISTANCE : RON[Ω]
1.8
CONVERSION EFFICIENCY [%]
FET ON RESISTANCE : RON[Ω]
BD9778F, BD9778HFP, BD9001F, BD9781HFP
4
Ta=125Ŋ
3
2
1
0
0
1
2
3
4
5
6
OUTPUT CURRENT : IO[A]
7
4
Ta=-40Ŋ
Ta=125Ŋ
3
2
1
0
0
1
2
3
4
OUTPUT CURRENT : IO[A]
5
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)
OUTPUT VOLTAGE : VO[V]
6
Ta=25Ŋ
5
Ta=-40Ŋ
4
Ta=125Ŋ
3
2
1
0
0
1
2
3
4
OUTPUT CURRENT : IO[A]
5
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
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Block diagram / Application circuit / Pin assignment
(BD9778F)
(BD9778HFP)
PVIN
8
EN
VIN
220µF
1µF
220µF
23kΩ
INV
10kΩ
GND EN
PVIN RT
SW
DRIVER
33µH
VO
10kΩ
2
RESET
TSD
OSC
-
PWM
COMPARATOR
LATCH
+
150kΩ
Vref
4700pF
+
+
5
LATCH
+
150kΩ
ERROR AMP
INV
PWM
COMPARATOR
-
Vref
SOFT
START
23kΩ
+
+
L:OFF
H:ON
1µF
Vref
ERROR AMP
4
7
ON/OFF
1
L:OFF
H:ON
SOFT
START
EN
VIN
5
ON/OFF
1
4700pF
TSD
OSC
330µF
330µF
VIN
+
-
SW INV
VIN FB
+
-
CURRENT LIMIT
CURRENT LIMIT
7
GND
3
FB
RT
VIN
SW
FB
FB INV EN
GND RT
RT
6
390kΩ
390kΩ
0.1µF
Fig.23
Fig.24
Function
Power supply input
Output
Error Amp output
Output voltage feedback
Enable
Frequency setting resistor connection
Ground
Power system power supply input
Pin name
VIN
SW
FB
INV
EN
RT
GND
PVIN
4
GND
3
6
0.1µF
No.
1
2
3
4
5
6
7
FIN
Pin name
VIN
SW
FB
GND
INV
RT
EN
-
Function
Power supply input
Output
Error Amp output
Ground
Output voltage feedback
Frequency setting resistor connection
Enable
Ground
(BD9781HFP)
(BD9001F)
EN/
SYNC
VIN
8
220µF
VIN
7
ON/OFF
1
L:OFF
H:ON
1µF
220µF
SOFT
START
1µF
23kΩ
INV
INV
+
+
10kʎ
-
PWM
COMPARATOR
LATCH
+
150kʎ
SW
33 µH
PWM
COMPARATOR
LATCH
33µH
2
TSD
OSC
4700pF
TSD
GND EN
VIN RT
+
-
+
CURRENT LIMIT
330µF
VIN
330µF
VIN
N.C. INV
SW FB
SW
DRIVER
RESET
Vref
1
RESET
OSC
+
150kΩ
VO
Vref
4700pF
+
+
10kΩ
DRIVER
SYNC
ERROR AMP
6
ERROR AMP
4
Vref
SOFT
START
Vref
23kʎ
CURRENT LIMIT
7
4
GND
5
GND
FB
3
RT
3
FB
6
RT
VIN
RT
FB EN/SINC
SW GND INV
0.1µF
0.1µF
Pin name
SW
N.C.
FB
INV
EN
RT
GND
VIN
390kΩ
390kʎ
Fig.25
No.
1
2
3
4
5
6
7
8
VO
2
VIN
No.
1
2
3
4
5
6
7
8
33µH
SW
DRIVER
RESET
Vref
Fig.26
No.
1
2
3
4
5
6
7
FIN
ýýýýýýFunction
Output
Non Connection
Error Amp Output
Output voltage feedback
Enable
Frequency setting resistor connection
Ground
Power supply input
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
6/16
Pin name
VIN
SW
RT
GND
FB
INV
EN/SYNC
-
Function
Power supply input
Output
Frequency setting resistor connection
Ground
Error Amp output
Output voltage feedback
Enable/Synchronizing pulse input
Ground
2010.02 - Rev. B
VO
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Technical Note
Description of operations
ERROR AMP
The ERROR AMP block is an error amplifier used to input the reference voltage (1 V typ.) and the INV pin voltage. The output
FB pin controls the switching duty and output voltage Vo. These INV and FB pins are externally mounted to facilitate phase
compensation. Inserting a capacitor and resistor between these pins enables adjustment of phase margin. (Refer to
recommended examples on page 11.)
SOF T START
The SOFT START block provides a function to prevent the overshoot of the output voltage Vo through gradually increasing
the normal rotation input of the error amplifier when power supply turns ON to gradually increase the switching Duty. The soft
start time is set to 5 msec (Typ.).
ON/OFF(BD9778F/HF P,BD9781HFP)
Setting the EN pin to 0.8 V or less makes it possible to shut down the circuit. Standby current is set to 0 µA (Typ.).
Furthermore, on the BD9781HFP, applying a pulse having a frequency higher than set oscillation frequency to the EN/SYNC
pin allows for external synchronization (up to +50% of the set frequency).
PWM COM PARATOR
The PWM COMPARATOR block is a comparator to make comparison between the FB pin and internal triangular wave and
output a switching pulse.
The switching pulse duty varies with the FB value and can be set in the range of 0 to 100%.
OSC(Oscillator)
The OSC block is a circuit to generate a triangular wave that is to be input in the PWM comparator. Connecting a resistor to
the RT pin enables setting of oscillation frequency.
TSD(Thermal Shut Down)
In order to prevent thermal destruction/thermal runaway of this IC, the TSD block will turn OFF the output when the chip
temperature reaches approximately 150˚C or more. When the chip temperature falls to a specified level, the output will be
reset. However, since the TSD is designed to protect the IC, the chip junction temperature should be provided with the thermal
shutdown detection temperature of less than approximately 150˚C.
CURREN T LIMIT
While the output POWER P-ch MOS FET is ON, if the voltage between drain and source (ON resistance ¥ load current)
exceeds the reference voltage internally set with the IC, this block will turn OFF the output to latch. The overcurrent protection
detection values have been set as shown below:
BD9781HFP . . . 8A(Typ.)
BD9001F,BD9778F/HFP . . . 4A(Typ.)
Furthermore, since this overcurrent protection is an automatically reset, after the output is turned OFF and latched, the latch will
be reset with the RESET signal output by each oscillation frequency.
However, this protection circuit is only effective in preventing destruction from sudden accident. It does not support for the
continuous operation of the protection circuit (e.g. if a load, which significantly exceeds the output current capacitance, is
normally connected). Furthermore, since the overcurrent protection detection value has negative temperature characteristics,
consider thermal design.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
7/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Timing chart
(BD9781HFP)
- While in basic operation mode
VIN
Internal
OSC
FB
SW
EN/SYNC
Fig.27
-
While in overcurrent protection mode
IO
Internal
OSC
FB
SW
Output short circuit
Auto reset
Auto reset
Auto reset
Auto reset
Fig.28
External synchronizing function (BD9781HFP)
In order to activate the external synchronizing function, connect the frequency setting resistor to the RT pin and then input
a synchronizing signal to the EN/SYNC pin. As the synchronizing signal, input a pulse wave higher than a frequency determined
with the setting resistor (RT). On the BD9781HFP, design the frequency difference to be within 50%. Furthermore,
set the pulse wave duty between 10% and 90%.
FSYNC
: For RT only
Internal
OSC
: For external
synchronization
Fig.29
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
8/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Description of external components
L
VIN
VO
SW
VIN
+
C
Cin
Di
CO
R1
INV
RT
RT
CT
R2
FB
SS
CC
GND
RC
CSS
Fig.30
Design procedure
Calculation example
Vo = Output voltage, Vin (Max.) = Maximum input voltage
Io (Max.) = Maximum load current, f = Oscillation frequency
1. Setting or output voltage
Output voltage can be obtained by the formula shown below.
When Vo = 5 V and R2 = 10 kΩ ,
VO=1 x (1+R1/R2)
5=1 x (1+R1/10kΩ)
Use the formula to select the R1 and R2.
Furthermore, set the R2 to 30 kΩ or less.
Select the current passing through the R1 and R2 to be small
enough for the output current.
R1=40kΩ
When VIN = 13.2 V, Vo = 5 V, Io = 2 A, and f = 100 kHz,
L=(13.2-5) x 5/13.2 x 1/100k x 1/(2 x 0.3)
=51.8µH 47µ
2. Selection of coil (L)
The value of the coil can be obtained by the formula shown
below:
L=(VIN-VO) x VO / (VIN x f x ∆IO)
∆IO: Output ripple current
f = Operating frequency
∆Io should typically be approximately 20 to 30% of Io.
If this coil is not set to the optimum value, normal (continuous)
oscillation may not be achieved. Furthermore, set the value of
the coil with an adequate margin so that the peak current passing
through the coil will not exceed the rated current of the coil.
3. Selection of output capacitor (Co)
The output capacitor can be determined according to the
output ripple voltage ∆Vo (p-p) required.
Obtain the required ESR value by the formula shown below
and then select the capacitance.
L=47µH
VIN=13.2V, Vo=5V, L=100µH, f=100kHz
∆IL=(13.2-5) x 5/(100 x 10-6 x 100 x 103 x 13.2)
0.31
∆IL=0.31A
∆IL=(VIN-VO) x VO/(L x f x VIN)
∆Vpp=∆IL x ESR+(∆IL x Vo)/(2 x Co x f x VIN)
Set the rating of the capacitor with an adequate margin to the
output voltage. Also, set the maximum allowable ripple current
with an adequate margin to ∆IL. Furthermore, the output rise
time should be shorter than the soft start time. Select the output
capacitor having a value smaller than that obtained by the
formula shown below.
3.5m x (ILimit-Io(Max))
CMax=
When ILimit: 2 A, Io (Max) = 1 A, and Vo = 5V,
CMax=3.5m x (2-1)/5
=700µ
Vo
ILimit:2A(BD9778F/HFP,BD9001F), 4A(BD9781HFP)
If this capacitance is not optimum, faulty startup may result.
CMax=700µF
(Ţ3.5m is soft start time(min.))
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
9/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Design procedure
Calculation example
4. Selection of diode
Set diode rating with an adequate margin to the maximum load
current. Also, make setting of the rated inverse voltage with
an adequate margin to the maximum input voltage.
A diode with a low forward voltage and short reverse recovery
time will provide high efficiency.
5. Selection of input capacitor
Two capacitors, ceramic capacitor CIN and bypass capacitor C,
should be inserted between the VIN and GND.Be sure to insert
a ceramic capacitor of 1 to 10 µF for the C. The capacitor C
should have a low ESR and a significantly large ripple current.
The ripple current IRMS can be obtained
by the following formula:
When VIN = 36 V and Io = (max.) 2 A,
Select a diode of rated current of 2 A or more and rated
withstand voltage of 36 V or more.
When VIN = 13.2 V, Vo = 5 V, and Io = 1 A,
IRMS=1 X 5 X (13.2-5)/(13.2)2
=0.485
IRMS=IO X VO X (Vin-VO)/ Vin2
Select capacitors that can accept this ripple current.
If the capacitance of CIN and C is not optimum,
the IC may malfunction.
IRMS=0.485A
6. Setting of oscillation frequency
Referring Fig. 34 and Fig. 35 on the following page, select R
for the oscillation frequency to be used. Furthermore,
in order to eliminate noises, be sure to connect ceramic
capacitors of 0.1 to 1.0 µF in parallel.
7. Setting of phase compensation (Rc and Cc)
The phase margin can be set through inserting a capacitor or
a capacitor and resistor between the INV pin and the FB pin.
Each set value varies with the output coil, capacitance,
I/O voltage, and load. Therefore, set the phase compensation
to the optimum value according to these conditions.
(For details, refer to Application circuit on page 11.)
If this setting is not optimum, output oscillation may result.
* The set values listed above are all reference values. On the actual mounting of the IC, the characteristics may vary with the routing of wirings
and the types of parts in use. In this connection, it is recommended to thoroughly verify these values on the actual system prior to use.
Directions for pattern layout of PCB
1
GND
RT
2
C
R3
Cx1
C3
8
EN
RT
INV
GND
FB
SW
VIN
BD9778HFP
CT
3
SIGNAL GND
Cin
8
L
Co
NMUCP
GND
L
O
A
D
R2
R1
4
Cx2
5
6
Fig.31
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
10/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Cin
C
Cin
Di
C
Cx2
R2
C3
R3
C3
Co
Cx2
R2
RT
CT Cx1
Di
R1
RT
CT
Cx1
R3
L
L
R1
Co
Fig.32 BD9001F reference layout pattern
Fig.33 BD9781HFP reference layout pattern
Ţ As shown above, design the GND pattern as large area as possible
within inner layer.
Ţ Gray zones indicate GND.
300
OSCILATING FREQUENCY : fosc[kHz]
OSCILATING FREQUENCY : fosc[kHz]
500
450
400
350
300
250
200
150
100
250
200
150
100
50
50 100
50
0
100
200
300
400
500
600
700
800
200
300
400
500
600
700
800
OSCILATING FREQUENCY SETTING RESISTANCE : RT[kΩ]
OSCILATING FREQUENCY SETTING RESISTANCE : RT [kΩ]
Fig.34 RT vs fOSC (BD9781HFP/BD9778F/HFP)
Fig.35 RT vs fOSC &BD9001F'
ŢMqagjj_rgmldpcosclaw%qep_nft_jscgq Rwnga_jt_jsc*
mqagjj_rgmldpcosclawgqlcacqq_pwrmamlqgbcpĺ0.#_qbgqncpqgml,
Phase compensation setting procedure
1.
Application stability conditions
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
(a)
A
FB
+
Feedback
A
R
-20dB/decade
Gain
[dB]
GBW(b)
0
-
f
0
Phase
-90
[˚]
C
-180
-90˚
Phase
margin
-180˚
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
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
2. For output capacitors having high ESR, such as electrolyte capacitor
For output capacitors that have high ESR (i.e., several Ω), the phase compensation setting procedure becomes
comparatively simple. Since the DC/DC converter application has a LC resonant circuit attached to the output, a -180˚
phase-delay occurs in that area. If ESR component is present, howeve r, a +90˚ phase-lead occurs to shift the phase
delay to -90˚. Since the phase delay should be set within 150˚, it is a very effective method but tends to increase
the ripple component of the output voltage.
(1) LC resonant circuit
(2) With ESR provided
VCC
VCC
L
L
VO
)
VO
+
RESR
(
C
1
fr =
C
[Hz]
At this resonance point, a -180˚
phase-delay occurs.
A -90˚ phase-delay occurs.
According to changes in phase characteristics, due to the ESR, only one phase lead should be inserted.
For this phase lead, select either of the methods shows below:
(3) Insert feedback resistance in the C.
(4) Insert the R3 in integrator.
VO
VO
C1
R3
C2
R1
C2
R1
-
-
FB
A
R2
FB
A
+
INV
+
INV
R2
To cancel the LC resonance, the frequency to insert the phase lead should be set close to the LC resonant frequency.
The settings above have are estimated. Consequently, the settings may be adjusted on the actual system. Furthermore,
since these characteristics vary with the layout of PCB loading conditions, precise calculations should be made on the
actual system.
3.
For output capacitors having low ESR, such as low impedance electrolyte capacitor or OS-CON
In order to use capacitors with low ESR (i.e., several tens of mΩ), two phase-leads should be inserted so that a -180˚
phase-delay, due to LC resonance, will be compensated. The following section shows a typical phase compensation
procedure.
(1) Phase compensation with secondary phase lead
VO
R3
R1
C2
C1
FB
A
+
INV
R2
To set phase lead frequency, insert both of the phase leads close to the LC resonant frequency. According to empirical rule,
setting the phase lead frequency f Z2 with R3 and C2 lower than the LC resonant frequency fr, and the phase lead frequency
fZ1 with the R1 and C1 higher than the LC resonant frequency fr, will provide stable application conditions.
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
12/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
<Reference> Measurement of open loop of DC/DC converter
To measure the open loop of DC/DC converter,
r use the gain phase analyzer or FRA
A to measure the frequency
characteristics.
DC/DC converter
controller
<Procedure>
1. Check to ensure output causes no oscillation at the maximum
load in closed loop.
2. Isolate (1) and (2) and insert Vm (with amplitude of
approximately 100 mVpp).
3. Measure (probe) the oscillation of (1) to that of (2).
VO
+
Vm
~
RL
Maximum load
Load
0
Inadequate phase margin
Output voltage
Adequate phase margin
t
Furthermore, the phase margin can also be measured with the
load responsiveness.
Measure variations in the output voltage when instantaneously
changing the load from no load to the maximum load.
Even though ringing phenomenon is caused, due to low phase margin,
no ringing takes place. Phase margin is provided. However,
no specific phase margin can be probed.
Heat loss
ºC
ºC
The heat loss W of the IC can be obtained by the formula shown below:
Vo
W=Ron X Io2 X
+ VIN X ICC + Tr X VIN X Io X f
VIN
Ron: ON resistance of IC (refer to pages 4 and 5.) Io: Load current Vo: Output voltage
VIN: Input voltage Icc: Circuit current (Refer to pages 2 and 3)
Tr: Switching rise/fall time (Approximately 40 nsec)
f : Oscillation frequency
Tr
1
VIN
1 Ron X Io2
1
1
X Tr X
X VIN X Io
T
2
=Tr X VIN X Io X f
2 2X
SW
waveform
GND
2
T=
1
f
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
13/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
SW
RT
VIN
FB&BD9778F/HFP, BD9781HFP '
VREF
VIN
INV
VREF
VREF
VIN
VIN
50kΩ
VIN
SW
FB
INV
10kΩ
1kΩ
1kΩ
300kΩ
RT
2kΩ
EN&BD9778F/HFP, BD9001F '
FB&BD9001F'
EN/SYNC&BD9781HFP'
VREF
VREGA
VIN
VIN
VIN
EN
FB
1kΩ
300kΩ
1kΩ
2kΩ
EN/SYNC
250kΩ
222
kΩ
221
kΩ
145
kΩ
139
kΩ
Fig.36 Equivalent circuit
Notes for use
1) Absolute maximum ratings
An excess in the absolute maximum ratings, such as supply voltage, temperature range of operating conditions, etc.,
can break down the devices, thus making impossible to identify breaking mode, such as a short circuit or an open circuit.
If any over rated values will expect to exceed the absolute maximum ratings, consider adding circuit protection devices,
such as fuses. Furthermore, don't turn on the IC with a fast rising edge of VIN. ( rise time << 10V / µsec )
2) GND potential
GND potential should maintain at the minimum ground voltage level. Furthermore, no terminals should be lower than the GND
potential voltage including an electric transients.
3) Thermal design
Use a thermal design that allows for a sufficient margin in light of the power dissipation (Pd) in actual operating conditions.
4) Inter-pin shorts and mounting errors
Use caution when positioning the IC for mounting on printed circuit boards. The IC may be damaged if there is any connection
error or if positive and ground power supply terminals are reversed. The IC may also be damaged if pins are shorted
together or are shorted to other circuits power lines.
5) Operation in strong electromagnetic field
Use caution when using the IC in the presence of a strong electromagnetic field as doing so may cause the IC to malfunction.
6) Inspection with set printed circuit board
When testing the IC on an application board, connecting a capacitor to a pin with low impedance subjects the IC to stress.
Always discharge capacitors after each process or step. Always turn the IC's power supply off before connecting it to,
or removing it from a jig or fixture, during the inspection process. Ground the IC during assembly steps as an antistatic
measure. Use similar precaution when transporting and storing the IC.
Resistor
Transistor (NPN)
(Pin A)
B
(Pin A)
(Pin B)
E
C
Parasitic element
GND
GND
N
P+
P+
P+
P
N
(PIN B)
N
N
P layer
P+
P
N
N
N
P layer
Parasitic element
C
B
E
GND
Parasitic element
GND
GND
Fig.37 Typical simple construction of monolithic IC
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
14/16
Parasitic element
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
7) IC pin input (Fig. 37)
This monolithic IC contains P+ isolation and P substrate layers between adjacent elements to keep them isolated.
P-N junctions are formed at the intersection of these P layers with the N layers of other elements, creating a parasitic diode
or transistor. For example, the relation between each potential is as follows:
When GND > Pin A and GND > Pin B, the P-N junction operates as a parasitic diode.
When Pin B > GND > Pin A, the P-N junction operates as a parasitic transistor. Parasitic diodes can occur inevitably in the
structure of the IC. The operation of parasitic diodes can result in mutual interference among circuits, operational faults,
or physical damage. Accordingly, methods by which parasitic diodes operate, such as applying a voltage that is lower than
the GND (P substrate) voltage toan input pin, should not be used.
8) Ground wiring pattern
It is recommended to separate the large-current GND pattern from the small-signal GND pattern and establish a single
ground at the reference point of the set PCB, so that resistance to the wiring pattern and voltage fluctuations due to
a large current will cause no fluctuations in voltages of the small-signal GND. Prevent fluctuations in the GND wiring pattern
of external parts.
9) Temperature protection (thermal shut down) circuit
This IC has a built-in temperature protection circuit to prevent the thermal destruction of the IC. As described above,
be sure to use this IC within the power dissipation range. Should a condition exceeding the power dissipation range continue,
the chip temperature Tj will rise to activate the temperature protection circuit, thus turning OFF the output power element.
Then, when the tip temperature Tj falls, the circuit will be automatically reset. Furthermore, if the temperature protection
circuit is activated under the condition exceeding the absolute maximum ratings, do not attempt to use the temperature
protection circuit for set design.
10) On the application shown below, if there is a mode in which VIN and each pin potential are inverted, for example,
if the VIN is short-circuited to the Ground with external diode charged, internal circuits may be damaged. To avoid damage,
it is recommended to insert a backflow prevention diode in the series with VIN or a bypass diode between each pin and VIN.
Bypass diode
Backflow prevention diode
Vcc
Pin
Fig.35
Thermal derating characteristics
SOP8
10
0.8
9
0.7
8
NMUCPBGQQGN?RGML ăPD[W]
NMUCPBGQQGN?RGML ăPD[W]
HRP7
ᰔ7.3W
7
6
ᰓ5.5W
5
4
3
ᰒ2.3W
2
1
0
ᰑ1.4W
25
50
75
100
125
0.5
0.4
0.3
0.2
BD9778F
BD9001F
0.1
0
25
50
75
100
125
150
ᰑ Single piece of IC
ᰒ When mounted on ROHM standard PCB
3
PCB size: 70 x 70 x 1.6 mm (PCB incorporates thermal via.)
Copper foil area on the front side of PCB: 10.5 x 10.5 mm2
ᰒ 2-layer PCB (Copper foil area on the reverse side of PCB: 15 x 15 mm2)
ᰓ 2-layer PCB (Copper foil area on the reverse side of PCB: 70 x 70 mm2)
ᰔ 4-layer PCB (Copper foil area on the reverse side of PCB: 70 x 70 mm2)
(Glass epoxy PCB of 70 mm x 70 mm x 1.6 mm)
Fig.39
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
ᰑ
?K@GCLRRCKNCP ?RSP CăR_ĪŊī
?K@GCLRRCKNCP ?RSP CăR_ĪŊī
ᰑ Single piece of IC
0.6
0
150
ᰒ
Fig.40
15/16
2010.02 - Rev. B
Technical Note
BD9778F, BD9778HFP, BD9001F, BD9781HFP
Selection of order type
B
D
9
Part No.
7
7
8
Part No.
9778 = 36V/2A
9781 = 36V/4A
9001 = 50V/2A
H
F
-
P
Package
F = SOP8
HFP = HRP7
T
R
Taping type
E2 = Reel-type embossed carrier tape (SOP8)
TR = Reel-type embossed carrier tape (HRP7)
SOP8
<Tape and Reel information>
7
6
5
6.2±0.3
4.4±0.2
0.3MIN
8
+6°
4° −4°
0.9±0.15
5.0±0.2
(MAX 5.35 include BURR)
1 2
3
Tape
Embossed carrier tape
Quantity
2500pcs
Direction
of feed
E2
The direction is the 1pin of product is at the upper left when you hold
( reel on the left hand and you pull out the tape on the right hand
)
4
0.595
1.5±0.1
+0.1
0.17 -0.05
S
S
0.11
0.1
1.27
0.42±0.1
Direction of feed
1pin
Reel
(Unit : mm)
∗ Order quantity needs to be multiple of the minimum quantity.
HRP7
<Tape and Reel information>
1.017±0.2
9.395±0.125
(MAX 9.745 include BURR)
8.82±0.1
1.905±0.1
Tape
Embossed carrier tape
Quantity
2000pcs
0.08±0.05
0.8875
Direction
of feed
TR
The direction is the 1pin of product is at the upper right when you hold
( reel on the left hand and you pull out the tape on the right hand
)
1pin
+5.5°
4.5° −4.5°
+0.1
0.27 -0.05
0.73±0.1
1.27
10.54±0.13
0.835±0.2
1 2 3 4 5 6 7
1.523±0.15
(7.49)
8.0±0.13
(5.59)
0.08 S
S
Direction of feed
(Unit : mm)
www.rohm.com
© 2010 ROHM Co., Ltd. All rights reserved.
Reel
16/16
∗ Order quantity needs to be multiple of the minimum quantity.
2010.02 - Rev. B
Datasheet
ご注意
ローム製品取扱い上の注意事項
1.
本製品は一般的な電子機器（AV 機器、OA 機器、通信機器、家電製品、アミューズメント機器等）への使用を
意図して設計・製造されております。従いまして、極めて高度な信頼性が要求され、その故障や誤動作が人の生命、
身体への危険若しくは損害、又はその他の重大な損害の発生に関わるような機器又は装置（医療機器(Note 1)、輸送機器、
交通機器、航空宇宙機器、原子力制御装置、燃料制御、カーアクセサリを含む車載機器、各種安全装置等）（以下「特
定用途」という）への本製品のご使用を検討される際は事前にローム営業窓口までご相談くださいますようお願い致し
ます。ロームの文書による事前の承諾を得ることなく、特定用途に本製品を使用したことによりお客様又は第三者に生
じた損害等に関し、ロームは一切その責任を負いません。
(Note 1) 特定用途となる医療機器分類
日本
USA
EU
CLASSⅢ
CLASSⅡb
CLASSⅢ
CLASSⅣ
CLASSⅢ
中国
Ⅲ類
2.
半導体製品は一定の確率で誤動作や故障が生じる場合があります。万が一、かかる誤動作や故障が生じた場合で
あっても、本製品の不具合により、人の生命、身体、財産への危険又は損害が生じないように、お客様の責任において
次の例に示すようなフェールセーフ設計など安全対策をお願い致します。
①保護回路及び保護装置を設けてシステムとしての安全性を確保する。
②冗長回路等を設けて単一故障では危険が生じないようにシステムとしての安全を確保する。
3.
本製品は、一般的な電子機器に標準的な用途で使用されることを意図して設計・製造されており、下記に例示するよう
な特殊環境での使用を配慮した設計はなされておりません。従いまして、下記のような特殊環境での本製品のご使用に
関し、ロームは一切その責任を負いません。本製品を下記のような特殊環境でご使用される際は、お客様におかれ
まして十分に性能、信頼性等をご確認ください。
①水・油・薬液・有機溶剤等の液体中でのご使用
②直射日光・屋外暴露、塵埃中でのご使用
③潮風、Cl2、H2S、NH3、SO2、NO2 等の腐食性ガスの多い場所でのご使用
④静電気や電磁波の強い環境でのご使用
⑤発熱部品に近接した取付け及び当製品に近接してビニール配線等、可燃物を配置する場合。
⑥本製品を樹脂等で封止、コーティングしてのご使用。
⑦はんだ付けの後に洗浄を行わない場合(無洗浄タイプのフラックスを使用された場合も、残渣の洗浄は確実に
行うことをお薦め致します)、又ははんだ付け後のフラックス洗浄に水又は水溶性洗浄剤をご使用の場合。
⑧本製品が結露するような場所でのご使用。
4.
本製品は耐放射線設計はなされておりません。
5.
本製品単体品の評価では予測できない症状・事態を確認するためにも、本製品のご使用にあたってはお客様製品に
実装された状態での評価及び確認をお願い致します。
6.
パルス等の過渡的な負荷（短時間での大きな負荷）が加わる場合は、お客様製品に本製品を実装した状態で必ず
その評価及び確認の実施をお願い致します。また、定常時での負荷条件において定格電力以上の負荷を印加されますと、
本製品の性能又は信頼性が損なわれるおそれがあるため必ず定格電力以下でご使用ください。
7.
許容損失(Pd)は周囲温度(Ta)に合わせてディレーティングしてください。また、密閉された環境下でご使用の場合は、
必ず温度測定を行い、ディレーティングカーブ範囲内であることをご確認ください。
8.
使用温度は納入仕様書に記載の温度範囲内であることをご確認ください。
9.
本資料の記載内容を逸脱して本製品をご使用されたことによって生じた不具合、故障及び事故に関し、ロームは
一切その責任を負いません。
実装及び基板設計上の注意事項
1.
ハロゲン系（塩素系、臭素系等）の活性度の高いフラックスを使用する場合、フラックスの残渣により本製品の性能
又は信頼性への影響が考えられますので、事前にお客様にてご確認ください。
2.
はんだ付けはリフローはんだを原則とさせて頂きます。なお、フロー方法でのご使用につきましては別途ロームまで
お問い合わせください。
詳細な実装及び基板設計上の注意事項につきましては別途、ロームの実装仕様書をご確認ください。
Notice - GE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
応用回路、外付け回路等に関する注意事項
1.
本製品の外付け回路定数を変更してご使用になる際は静特性のみならず、過渡特性も含め外付け部品及び本製品の
バラツキ等を考慮して十分なマージンをみて決定してください。
2.
本資料に記載された応用回路例やその定数などの情報は、本製品の標準的な動作や使い方を説明するためのもので、
実際に使用する機器での動作を保証するものではありません。従いまして、お客様の機器の設計において、回路や
その定数及びこれらに関連する情報を使用する場合には、外部諸条件を考慮し、お客様の判断と責任において行って
ください。これらの使用に起因しお客様又は第三者に生じた損害に関し、ロームは一切その責任を負いません。
静電気に対する注意事項
本製品は静電気に対して敏感な製品であり、静電放電等により破壊することがあります。取り扱い時や工程での実装時、
保管時において静電気対策を実施の上、絶対最大定格以上の過電圧等が印加されないようにご使用ください。特に乾燥
環境下では静電気が発生しやすくなるため、十分な静電対策を実施ください。
（人体及び設備のアース、帯電物からの
隔離、イオナイザの設置、摩擦防止、温湿度管理、はんだごてのこて先のアース等）
保管・運搬上の注意事項
1.
本製品を下記の環境又は条件で保管されますと性能劣化やはんだ付け性等の性能に影響を与えるおそれがあります
のでこのような環境及び条件での保管は避けてください。
①潮風、Cl2、H2S、NH3、SO2、NO2 等の腐食性ガスの多い場所での保管
②推奨温度、湿度以外での保管
③直射日光や結露する場所での保管
④強い静電気が発生している場所での保管
2.
ロームの推奨保管条件下におきましても、推奨保管期限を経過した製品は、はんだ付け性に影響を与える可能性が
あります。推奨保管期限を経過した製品は、はんだ付け性を確認した上でご使用頂くことを推奨します。
3.
本製品の運搬、保管の際は梱包箱を正しい向き（梱包箱に表示されている天面方向）で取り扱いください。天面方向が
遵守されずに梱包箱を落下させた場合、製品端子に過度なストレスが印加され、端子曲がり等の不具合が発生する
危険があります。
4.
防湿梱包を開封した後は、規定時間内にご使用ください。規定時間を経過した場合はベーク処置を行った上でご使用
ください。
製品ラベルに関する注意事項
本製品に貼付されている製品ラベルに QR コードが印字されていますが、QR コードはロームの社内管理のみを目的と
したものです。
製品廃棄上の注意事項
本製品を廃棄する際は、専門の産業廃棄物処理業者にて、適切な処置をしてください。
外国為替及び外国貿易法に関する注意事項
本製品は外国為替及び外国貿易法に定める規制貨物等に該当するおそれがありますので輸出する場合には、ロームに
お問い合わせください。
知的財産権に関する注意事項
1.
本資料に記載された本製品に関する応用回路例、情報及び諸データは、あくまでも一例を示すものであり、これらに
関する第三者の知的財産権及びその他の権利について権利侵害がないことを保証するものではありません。従いまして、
上記第三者の知的財産権侵害の責任、及び本製品の使用により発生するその他の責任に関し、ロームは一切その責任を
負いません。
2.
ロームは、本製品又は本資料に記載された情報について、ローム若しくは第三者が所有又は管理している知的財産権
その他の権利の実施又は利用を、明示的にも黙示的にも、お客様に許諾するものではありません。
その他の注意事項
1.
本資料の全部又は一部をロームの文書による事前の承諾を得ることなく転載又は複製することを固くお断り致します。
2.
本製品をロームの文書による事前の承諾を得ることなく、分解、改造、改変、複製等しないでください。
3.
本製品又は本資料に記載された技術情報を、大量破壊兵器の開発等の目的、軍事利用、あるいはその他軍事用途目的で
使用しないでください。
4.
本資料に記載されている社名及び製品名等の固有名詞は、ローム、ローム関係会社若しくは第三者の商標又は登録商標
です。
Notice - GE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.002
Datasheet
一般的な注意事項
1.
本製品をご使用になる前に、本資料をよく読み、その内容を十分に理解されるようお願い致します。本資料に記載
される注意事項に反して本製品をご使用されたことによって生じた不具合、故障及び事故に関し、ロームは一切
その責任を負いませんのでご注意願います。
2.
本資料に記載の内容は、本資料発行時点のものであり、予告なく変更することがあります。本製品のご購入及び
ご使用に際しては、事前にローム営業窓口で最新の情報をご確認ください。
3.
ロームは本資料に記載されている情報は誤りがないことを保証するものではありません。万が一、本資料に記載された
情報の誤りによりお客様又は第三者に損害が生じた場合においても、ロームは一切その責任を負いません。
Notice – WE
© 2014 ROHM Co., Ltd. All rights reserved.
Rev.001