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BD8627EFV-E2

P1-P3P4-P6P7-P9P10-P12P13-P13
Technical Note
7/12
BD8627EFV
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
No. Symbol Explanation Terminal equivalent circuit diagram
18 SS Soft start time adjustment terminal
19 FC
Error amplifier compensation
terminal
20 RT
Oscillator frequency adjustment
terminal
18
VIN
SGND
20
VIN
SGND
Technical Note
8/12
BD8627EFV
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
● Operation description
Enable control
The device can be controlled ON/OFF by EN terminal (16 pin) voltage.
An internal circuit starts when VEN reaches 0.65V.
VEN
0
EN terminal voltage
VSS
0
SS terminal voltage
VSSCLM
VSSTH
Output setting voltage
VO
0
tSS
VENTH
PDET
VPDET
0
Fig.3 ON/OFF transition wave form in EN controlling
Soft start time set function
As for BD8627EFV, output can do soft start without overshoot by charging soft start capacity (CSS) connected between SS
and SGND terminal.
Also, soft start time (tss) can be set by setting soft start capacity (CSS) arbitrarily.
Technical Note
9/12
BD8627EFV
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
OSC oscillation frequency setting function
The output oscillation frequency can be set by connecting resistance between terminal RT (20 pins) and SGND
(range = 250kHz - 1MHz)
The relation between RT terminal resistance and the oscillation frequency follows Fig.4.
Fig. 4 RT resistance-oscillation frequency
10
100
1000
10000
10 100 1000 10000
RT terminal resistance [kΩ]
Frequency [kHz]
P1-P3P4-P6P7-P9P10-P12P13-P13

BD8627EFV-E2

Mfr. #:
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Switching Voltage Regulators POWER SUPPLY IC
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