BM2P21A datasheet(5/24 Pages) ROHM

Part #	BM2P21A

Description	PWM Type DC/DC converter IC Integrated Switching MOSFET

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Manufacturer	ROHM [Rohm]

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Datasheet

BM2PX1A/BM2PX1B Series

TSZ02201-0F1F0A200100-1-2

22. Mar.2017.Rev.002

www.rohm.com

TSZ22111・15・001

Block Description

(1) Start circuit / AC Voltage UVLO / Discharge function (VH: Pin 5)

This IC has a built-in start circuit. The IC also has the AC voltage UVLO (Under Voltage Lock Out) function which

stops to operate the pulse operation when the AC voltage lowers at the VH pin, and the discharge function which

discharges X-cap if the AC voltage outlet is pulling out.

The Application circuit and Block Diagram are shown in Figure 1 and Timing chart is shown in Figure 2.

Figure 1. Application circuit and Block Diagram

Figure 2. X-Capacitance Discharge / AC voltage UVLO Timing chart

A: The AC voltage input is turned OFF.

B: After TDISON (Typ.=128ms), so DC/DC is turned OFF and VCC is higher than VCHG1(Typ.=10.7V) that VCC

capacitor is discharged.

C: VCC becomes higher than VCHG1(Typ.=10.7V), and the IC starts the recharge from VH pin to VCC pin. At this

moment, VCC capacitor discharge is stopped.

D: It stops charging to VCC pin when VCC becomes higher than VCHG2(Typ.=15.0V). And it starts discharging of VCC

capacitor.

E: Same as C

F: Same as D

G: Same as C

H: Same as D

I: VCC< VUVLO2(Typ.=10.2V)

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