BD9006F View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BD9006F

Flexible Step-down Switching Regulators with Built-in Power MOSFET

ROHM Semiconductor 

BD9006F, BD9006HFP, BD9007F, BD9007HFP

●Timing Chart

(All series)

・Basic Operation

VIN

Internal

slope

FB

Technical Note

SW

VEN/SYNC

Fig.21

●External synchronizing function

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).

However, the external sync frequency should be configured at less than double the configured frequency.

(ex.) When the configured frequency is 100kHz, the external sync frequency should be less than 200kHz.

Furthermore, the pulse wave’s LOW voltage should be under 0.8V and the HIGH voltage over 2.6V (when the HIGH voltage

is over 6V the EN/SYNC input current increases [see p.4 Fig.8]), the through rate of stand-up (and stand-down) under

20V/μS.

VIN=13.2V

BD9006HFP

C2

open

CIN

220μF

REG

R1

47kΩ

C28

2μF

33μH

L1

C0

330μF

SW

R3

30kΩ

D1

C1

22000pF

C3

open

RT

51kΩ

GND

GND

GND

R2

15kΩ

Fig.22 External Sync Sample Circuit

(Vo=3.3V, Io=1A, f=300kHz, EN/SYNC=450kHz)

www.rohm.com

© 2009 ROHM Co., Ltd. All rights reserved.

9/17

Ven/sync=0～5V

f=450kHz

SR=20V/μs

Duty=50%

2009.05 - Rev.A

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