BM2P129TF datasheet(6/24 Pages) ROHM

Part #	BM2P129TF

Description	PWM type DC/DC converter IC Integrated Switching MOSFET for non-Isolated type

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Manufacturer	ROHM [Rohm]

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Datasheet

BM2P139TF/BM2P135TF/BM2P137TKF/BM2P129TF

SZ02201-0F1F0A200260-1-2

20.Feb.2017.Rev.001

www.rohm.com

TSZ22111・15・001

(2) Start sequences (start-up operation, light load operation, over load protection function)

Start sequences are shown in Figure 3. See the sections below for detailed descriptions.

DRAIN-GND

VCC - GND_IC

VOUT - GND

IOUT

NORMAL

LOAD

LIGHT

LOAD

OVER

LOAD

SWITCHING

Internal 128ms

128ms

OVER

LOAD

128ms

512ms

OLP setting

BURST

MODE

AB C DE

F

G

H I

J

K

VCHG1

VCHG2

VUVLO1

VUVLO2

Figure 3. Start sequences timing chart

A: Input voltage is applied to the DRAIN pin and the VCC pin voltage rises.

B: If the VCC pin voltage exceeds VUVLO1, the IC starts to operate. And if the IC judges the other protection functions as

normal condition, it starts switching operation. The soft start function limits the over current limiter value to prevent

any excessive voltage or current rising. When the switching operation starts, the VOUT rises.

C: Till the secondary input voltage becomes constant value from starting-up, the VCC pin voltage drops by the VCC pin

consumption current.

D: After switching starts, it is necessary that the output voltage is set to rating voltage within TFOLP (128ms typ).

E: At light load, the IC starts burst operation to restrict the consumption power.

F: When the load exceeds a certain electric power, the IC starts over load operation.

G: If the setting over load status lasts for T FOLP (128ms typ), switching is turned OFF.

H: When the VCC pin voltage becomes less than VCHG1, recharge operation is started.

I: When the VCC pin voltage becomes more than VCHG2, recharge operation is stopped.

J: After TFOLP2 (512ms typ), the over load protection circuit starts switching.

K: Same as G

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