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參數資料
| 型號： | BD3504FVM-TR |
| 廠商： | Rohm Semiconductor |
| 文件頁數： | 10/19頁 |
| 文件大?。?/td> | 605K |
| 描述： | IC REG CTRLR SGL POS ADJ 8MSOP |
| 標準包裝： | 2,000 |
| 類型： | 正，可調式 |
| 輸出數： | 1 |
| 輸出電壓： | 0.65 V ~ 2.5 V |
| 輸入電壓： | 4.5 V ~ 5.5 V |
| 工作溫度： | -10°C ~ 100°C |
| 封裝/外殼： | 8-VSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 供應商設備封裝： | 8-MSOP |
| 包裝： | 帶卷 (TR) |
BD3504FVM,BD3500FVM,BD3501FVM,BD3502FVM
Technical Note
10/16
www.rohm.com
2010.05 - Rev.A
?2010 ROHM Co., Ltd. All rights reserved.
?SPAN class="pst BD3504FVM-TR_2649171_6">Application circuit
C3
C2
Ven
C4
C5
VIN
C1
Vcc
+
1
2
3
4
8
7
6
5
VIN
R1
R2
C3
Ven
C4
C1
Vcc
+
1
2
3
4
8
7
6
5
C2
R1
R2
?SPAN class="pst BD3504FVM-TR_2649171_6">Directions for pattern layout of PCB
鸅ecause a VIN input capacitor causes impedance to drop, mount it as close to the VIN terminal as possible and use thick
wiring patterns. In the event that it causes the wire to come in contact with the inner-layer ground plane, use a plurality of
through holes.
鸅ecause the NRCS terminal is analog I/O, take care to noise. In particular, high-frequency noise of GND may cause IC
maloperation through capacitors. It is recommended to connect GND of NRCS capacitor to IC GND terminal at one
point.
鸗he VFB terminal is an output voltage sense line. Effects of wiring impedance can be ignored by sensing the output
voltage from the load side, but increased sense wiring causes VFB to be susceptible to noise, to which care must be
taken.
鸅ecause the GND terminal is GND to be used in analog circuit inside BD3501/02/04FVM, connect it at one point to
inner-layer GND of substrate by as short pattern as possible. Arrange a bypass capacitor across VCC and GND as close
as possible so that a loop can be minimized.
鸗he G terminal is a terminal for gate drive. If long wiring is inevitable, increase the pattern width and lower impedance.
鸋eat generated in the output transistor can be calculated by:
(VIN - VOUT) ?Io(Max)
Design heat generation not to exceed the guarantee temperature of transistor.
鸆onnect the output capacitor with thick short wiring so that the impedance is lowered. Connect capacitor GND to
inner-layer GND plane by a plurality of through holes.
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