BM2P063HK-LBZ datasheet(6/23 Pages) ROHM

部品番号	BM2P063HK-LBZ

部品情報	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

(3) Over Current Limiter

This IC has a built-in over current limiter per cycle. When the SOURCE pin voltage becomes VCSA (Typ = 0.400 V) or

VCSB (Typ = 0.300 V) or more for 1 pulse, switching is turned off after passing internal delay time. The delay time

varies in relation to the time by which the SOURCE pin voltage reaches VCSA (Typ = 0.400 V) or VCSB (Typ = 0.300 V).

By this time, AC voltage correction function operates. The relations of the time until the SOURCE pin voltage reaches

VCSA (Typ = 0.400 V) or VCSB (Typ = 0.300 V) and the additional delay time are shown in below.

Figure 6A. Delay Time vs the Time by Which the

SOURCE Pin Voltage Reaches VCSA (Typ = 0.400 V)

(BM2P063HK-LBZ)

Figure 6B. Delay Time vs the Time by Which the

SOURCE Pin Voltage Reaches VCSB (Typ = 0.300 V)

(BM2P103HK-LBZ)

Figure 6C. Delay Time vs the Time by Which the

SOURCE Pin Voltage Reaches VCSB (Typ = 0.300 V)

(BM2P133HK-LBZ)

Ip is calculated by the following formula.

�� =

��

× (�� + �� + ��)

[A]

where:

��

is the AC Input Voltage.

��

is the Primary Inductance.

�� is the Time to VCSA or VCSB.

�� is the Additional Delay Time introduced by the IC (Refer to Figure 6A to Figure 6C).

�� is the Delay Time peculiar to the IC (Typ = 0.2 μs).

It is necessary to evaluate application in the end and adjust sense resistor and so on.

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