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PDF BD9207FPS Data sheet ( Hoja de datos )
| Número de pieza | BD9207FPS | |
| Descripción | Step-down type | |
| Fabricantes | ROHM Semiconductor | |
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LED Driver series for lighting
Step-down type
with 1.5A output
BD9207FPS
No.09093EAT01
●Description
BD9207FPS is a LED driver with built-in step-down switching regulator and incorporates the built-in switching MOS EFT of
Pch.
Feedback voltage is as low as 0.2V and can suppress the loss on the sense resistance of LED.
It is operated by PWM method with an oscillating frequency of 900 KHz and can use smaller coil than a switching regulator
of low-frequency operation.
●Features
1) Maximum switching current of 1.5A
2) Built-in Pch switching MOS FET for high efficiency
3) Low loss because feedback voltage is as low as 0.2V
4) High oscillating frequency of 900KHz (Fixed)
5) Built-in soft start function
6) Built-in overcurrent protection circuit (OCP)
7) Built-in thermal shutdown circuit (TSD)
8) ON/OFF of output is possible by STBY terminal.
9) Compact surface-mount TO252S-5 package
●Applications
・For use in the light sources of PPC
・Printer etc. and the LCD backlights of LED lighting apparatus & monitor
・Note PC etc.
●Absolute maximum ratings（Ta=25℃）
Parameter
Symbol
Rating
Unit
Supply voltage（VCC-GND）
Vcc 36 V
STBY-GND Voltage
OUT-GND Voltage
INV-GND Voltage
VSTBY
36 V
VOUT
36 V
VINV
5V
Maximum switching output current.
Iout
1.5(*1)
A
Allowable loss
Operating temperature range
Pd
800(*2)
mW
Topr
-20 ~ +85
℃
Storage temperature range
Tstg
-55 ~ +150
℃
(*1)Regardless of the listed rating, do not exceeded Pd, ASO or Tjmax=150℃.
(*2) Without heat sink, reducing by the 16 mW every 1℃ rise in temperature. (above 25℃)
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© 2009 ROHM Co., Ltd. All rights reserved.
1/11
2009.07 - Rev.A
1 page  
BD9207FPS
Technical Note
●Selection and setting of application parts
Coil L1
The application efficiency will decrease by the larger serial resistance element of coil. Moreover, because OCP operates
by 1.6A(min) or more, so please notice the heat generated by overload output or short.
Please set current ratings of coil with IOUT(MAX)＋⊿IL or more. Iout（MAX）: maximum load current
If current flows more than ratings current, then coil generates heat, magnetic saturation, and causes oscillation or low
efficiency.
Please select the peak current with enough margins not to exceed current rating of coil.
(VCC－VOUT)
⊿IL. =
L1
VOUT
1
× VCC × fosc
L1: Coil value,VCC: Input voltage,VOUT: Output voltage, ⊿IL: Ripple current, fosc: Oscillation frequency
When value the efficiency , we recommend C10-H5R(mitsumi) . Efficiency will be improved about 1~2%.
Schottky diode D1
Please select Schottky diode with lowest forward voltage VF.
(We can suppress the dissipation of forward voltage descent, and raise the efficiency. ）
Diode selection is based on maximum forward current rating, reverse voltage rating and permissible power dissipation of
diode.
・The maximum current ratings are assumed more than the value of maximum load current+ coil ripple current（⊿IL）.
・Reverse voltage rating is set to be VIN or more.
・Please choose the smallest one of reverse current IR.
Especially, IR grows at high temperature, and causes thermo runaway.
・Select the diode which permissible power dissipation within ratings.
Diode power dissipation Pdi is shown below.
Pdi=Iout(MAX)×Vf×(1-VOUT/VCC)
Iout（MAX）: Load current. Vf: Forward voltage, VOUT: Output voltage, VCC: Input voltage
Output capacitor C1
Select the output capacitor with ESR met the following formula.
ESR≦⊿VL/⊿IL
⊿VL : Permissible ripple voltage, ⊿IL : Ripple current
Moreover, permissible ripple current effective value of output capacity is calculated by the next formula, and use this
value to select the capacitor with enough margins.
IRMS =⊿IL/2√3
IRMS: Permissible ripple current effective value of output capacity, ⊿IL : Ripple current
Ceramic capacitor must use the one more than B characteristic.
Besides above mentioned, IC might not be normally operated according to the different setting condition of ambient
temperature and output voltage.
Moreover, even aluminum electrolytic capacitor can be used, please confirm its operation enough before using it.
Input capacitor C2
Input capacitor built in Pch MOS FET ON is the current supply of coil by FET.
So, please close to IC as near as possible to connect it. Enough margins is taken on setting input capacitor in capacitor
withstand voltage and permissible ripple current value. According to the ripple current effective value of input capacitor
shown below, select the capacitor with enough permissible ripple current value.
IRMS＝IOUT×√ (1－VOUT / VCC)×VOUT / VCC
IRMS : Permissible ripple current value of input capacitor
IOUT : Load current. VOUT: Output voltage, VCC: Input voltage
www.DataSheet4U.com
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
5/11
2009.07 - Rev.A
5 Page 
BD9207FPS
●Ordering part number
BD
9207
Part No.
Part No.
Technical Note
FPS - E2
Package
FPS: TO252S-5
Packaging and forming specification
E2: Embossed tape and reel
TO252S-5
C0.5
6.5±0.2
5.1+−00..21
FIN
1.2±0.1
0.27±0.1
3
0.71 1 2
1.27
45
4
+6
–4
0.27±0.1
S 0.6±0.2
0.08 M
0.27±0.1
0.08 S
(Unit : mm)
<Tape and Reel information>
Tape
Quantity
Embossed carrier tape
2000pcs
Direction
of feed
E2
( )The direction is the 1pin of product is at the lower left when you hold
reel on the left hand and you pull out the tape on the right hand
Reel
1pin Direction of feed
∗Order quantity needs to be multiple of the minimum quantity.
www.DataSheet4U.com
www.rohm.com
© 2009 ROHM Co., Ltd. All rights reserved.
11/11
2009.07 - Rev.A
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet BD9207FPS.PDF ] | |
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