參數(shù)資料
型號(hào): BD9007HFP
元件分類: 穩(wěn)壓器
英文描述: 2 A SWITCHING REGULATOR, 505 kHz SWITCHING FREQ-MAX, PSSO7
封裝: ROHS COMPLIANT, HRP-7
文件頁(yè)數(shù): 18/18頁(yè)
文件大?。?/td> 484K
代理商: BD9007HFP
BD9006F, BD9006HFP, BD9007F, BD9007HFP
Technical Note
9/17
www.rohm.com
2009.05 - Rev.A
2009 ROHM Co., Ltd. All rights reserved.
VI
N
SW
FB
GN
D
INV
RT
EN
/SY
N
C
VIN
VIN=13.2V
220μF
CIN
C28
2μF
SW
33μH
L1
C0
330μF
D1
47k
R1
15k
R2
GND
C3
open
R3
30k
RT
REG
C2
open
C1
22000pF
51k
BD9006HFP
1
2
3
4
5
6
7
Ven/sync=0~5V
f=450kHz
SR=20V/μs
Duty=50%
Timing Chart
(All series)
·
Basic Operation
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.
Fig.21
Fig.22 External Sync Sample Circuit
(Vo=3.3V, Io=1A, f=300kHz, EN/SYNC=450kHz)
VIN
VEN/SYNC
FB
SW
Internal
slope
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