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BD7F100HFN-LB BD7F100EFJ-LB

TSZ02201-0J1J0AJ00910-1-2

© 2014 ROHM Co., Ltd. All rights reserved.

29.Jun.2016 Rev.002

www.rohm.com

TSZ22111・15・001

Description of Blocks - continued

7.

LOAD COMPENSATION

This is the block which compensates the output voltage regulation by VF characteristic fluctuation of the secondary side

output diode according to the load current.

The current which flows into the built-in N-Channel MOSFET is monitored, and the current according to the compensation

quantity and the time constant which are determined by the external resistor and the capacitor of the COMP terminal is

drawn from the REF terminal. The output voltage rises and is rectified when feedback current which flows into the external

resistor of the REF terminal decreases and the REF terminal voltage falls.

8.

TSD

This is the temperature protection block.

If the chip’s junction temperature, Tj, inside the IC is above 175°C (Typ), it will be detected and this block will be in the

protection state and the SW terminal becomes Hi-Z.

If Tj falls to below 150°C (Typ), it will return automatically through soft start.

9.

OCP

This is the over-current protection block.

If the peak current during the ON-Time of the built-in N-Channel MOSFET reaches 1.25A (Typ), it will be detected and the

N-Channel MOSFET is turned OFF.

If output voltage goes to 50% or less of the setting voltage, the peak detection current of OCP will be controlled by 0.625A

(Typ).The min off time is 1.5μs (Typ) when the OCP is operated under the condition where the output voltage is 50% of

the set voltage.

Absolute Maximum Ratings (Ta = 25 °C)

Parameter

Symbol

Rating

Unit

BD7F100HFN-LB

BD7F100EFJ-LB

45

V

SW Terminal Voltage

60

V

SDX/EN Terminal Voltage

V

FB Terminal Voltage

V

REF Terminal Voltage

7

V

COMP Terminal Voltage

7

V

Power Dissipation

Pd

W

Storage Temperature Range

Tstg

-

55 to +150

°C

Maximum Junction Temperature

Tjmax

150

°C

(Note 1) Not to exceed Power Dissipation (Pd).

(Note 2) Reduced by 14.0mW/°C for temperatures above 25°C (when mounted on a one-layer glass-epoxy board with 70mm × 70mm × 1.6mm dimension,

65% copper foil density)

(Note 3) Reduced by 30.0mW/°C for temperatures above 25°C (when mounted on four-layer glass-epoxy board with 70mm × 70mm × 1.6mm dimension.)

Caution: Operating the IC over the absolute maximum ratings may damage the IC. The damage can either be a short circuit between pins or an open circuit

between pins and the internal circuitry. Therefore, it is important to consider circuit protection measures, such as adding a fuse, in case the IC is operated

over the absolute maximum ratings.

Recommended Operating Conditions

Parameter

Symbol

Limit

Unit

Min

Typ

Max

VIN Input Power Voltage

3

24

40

V

SW Terminal Voltage

-

-

50

V

Tj

-

40

-

+125

°C

(Note 4) Life time is derated at junction temperature greater than 125°C.