BM2P063HK-LBZ datasheet(7/23 Pages) ROHM

Teilenummer	BM2P063HK-LBZ

Bauteilbeschribung	PWM Type DC/DC Converter IC Integrated Switching MOSFET

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BM2P063HK-LBZ BM2P103HK-LBZ BM2P133HK-LBZ

TSZ22111 • 15 • 001

TSZ02201-0F1F0A200670-1-2

06.Oct.2020 Rev.001

4.

DC/DC Driver – continued

(4) Dynamic Over Current Limiter

This IC has a built-in dynamic over current limiter circuit. When the SOURCE pin voltage becomes VDCS (Typ = 1.050

V) or more for two consecutive times, it stops switching operation for tDCS (Typ = 128 μs).

Figure 7. State Transition of Switching Frequency

(5) Soft Start Function

This function controls the over current limiter value in order to prevent any excessive rise in voltage or current upon

startup. Figure 8 shows the details of soft start function. The IC implements soft start function by changing the over

current limiter value with time.

Figure 8. The SOURCE Pin Voltage vs Time

(6) L.E.B. Time

When MOSFET is turned ON, surge current occurs by capacitive elements and drive current. During this time, there is

a probability of detection error in the over current limiter circuit due to a rise in the SOURCE pin voltage. To prevent it,

there is a built-in L.E.B. function (Leading Edge Blanking function) to mask the SOURCE pin voltage for tLEB (Typ =

250 ns) after turn ON.

SOURCE

Voltage

Dynamic

Current Limitter

2 Count

tDCS

1

2

DC/DC

DC/DC ON

DC/DC OFF

VDCS

Time [ms]

SOURCE Voltage[V]

2.0

4.0

VDCS

8.0

VCS

VCS x 0.75

VCS x 0.50

VCS x 0.25

VDCS

VDCS x 0.75

VDCS x 0.25

VDCS x 0.50

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