BD8150KVT-E2 データシートの表示（PDF） - ROHM Semiconductor

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BD8150KVT-E2

4-channel System Power Supply + Gamma Buffer Amp IC

ROHM Semiconductor 

BD8150KVT

Technical Note

1-10 When only one channel is used for the DC/DC converter

This IC has built-in detector circuits for detection of output voltage startup. The ENABLE signal changes to High when

all detectors are on, meaning the ENABLE signal (Pin 34) will not switch to High if channels not used by the DC/DC

converter are set to OFF. If there exist channels that are not used, set them as follows so that the ENABLE signal will

be switched to High.

(1) Make the CTL (Pins 63, 64) HIGH (VCC).

(2) Detection is performed on the feedback side, so the INV and NON of unused channels should be shorted.

(3) Connect the SS pin to GND.

1-11 Output short protection circuit

This IC has a built-in timer latch type output short protection function

to prevent damage from overcurrent from the output MOSFET.

Adding capacitance to the SCP pin (Pin 33) allows the delay time

to be set until protection can be provided.

In the event of an output short, a rated current (7μA, Typ.) flows

to the SCP capacitor. When the threshold voltage (1.25V, Typ.) is

attained, a latch is applied and the IC is shut down. The

shutdown is canceled by CTL or turning the power on again. Refer

to Fig. 29 in order to determine the capacitance that will set the

delay time.

The output power transistor damage time varies depending on

the application, so perform evaluations using the actual product

under operating conditions. Furthermore, if not using short

protection, short the SCP pin to GND.

1.00E-01

SCP PIN CAPACITOR vs. SCP TIME

1.00E-02

1.00E-03

1.00E-04

1.00E-05

1.00E-06

1.00E-11

1.00E-10

1.00E-09

1.00E-08

CSCP [F]

1.00E-07

1.00E-06

Fig. 29 SCP Capacitance vs

Short Protection Delay Time

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© 2009 ROHM Co., Ltd. All rights reserved.

11/18

2009.07 - Rev.B

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