BM1Q011FJ datasheet(7/30 Pages) ROHM

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BM1Q011FJ Datasheet(PDF) 7 Page - Rohm

Part #	BM1Q011FJ

Description	Quasi-Resonant Control type DC/DC Converter IC

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Manufacturer	ROHM [Rohm]

Direct Link	http://www.rohm.com

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BM1Q011FJ Datasheet(HTML) 7 Page - Rohm

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Datasheet

BM1Q011FJ

TSZ02201-0F1F0A200180-1-2

21.Jan.2016 Rev.001

www.rohm.com

TSZ22111・15・001

Figure 8 shows operation waveform of start-up.

Secondary

output

Switing

Voltage

VCC(5pin)

VH input

current

VUVLO1

ISTART1

ISTART3

ISTART2

Set voltage

VSC

Figure 8. Start-up Waveform

A: By inserting to outlet, the VH voltage applies. From this moment, charging to VCC pin starts from the VH pin through

starter circuit. At the time, due to VCC < VSC (typ=0.8V), VH input current is limited to ISTART1 by the VCC pin short

protection function.

B: Because of VCC voltage > VSC (typ=0.8V), VCC short protection is released and the current of the VH input current

waveform flows from VH pin.

C: Because of VCC voltage > VUVLO1 (typ=13.5V), the start-up circuit stops and VH input current is limited to ISTART3

(typ=10uA) only. Furthermore, for starting switching operation secondary output starts to rise however the VCC pin

voltage lowers because the Secondary output is low yet. The falling rate of the VCC is determined by the VCC pin

capacitance, the consumption current of the IC and the load current that flows from the VCC pin. (V/t = Cvcc/Icc)

D: Because secondary output has risen to specific voltage, the VCC pin is applied from the auxiliary winding and VCC

voltage is stabilized.

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