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TSZ02201-0F3F0AJ00170-1-2

© 2017 ROHM Co., Ltd. All rights reserved.

11.Dec.2017 Rev.001

www.rohm.com

TSZ22111

• 15 • 001

BD9E104FJ

Function Description

1.

DC/DC converter operation

BD9E104FJ is a synchronous rectifying step-down switching regulator that achieves faster transient response by

employing current mode PWM control system.

It utilizes switching operation in PWM (Pulse Width Modulation) mode

for heavier load, while it utilizes SLLMTM (Simple Light Load Mode) control for lighter load to improve efficiency.

Figure 39. SW Waveform (1: SLLMTM control)

(VIN=12 V, VOUT=5.0 V, IOUT=10 mA)

Figure 40. SW Waveform (2: PWM control)

(VIN= 12 V, VOUT=5.0 V, IOUT=1 A)

1: SLLMTM control

2: PWM control

Figure 38. Efficiency (SLLMTM control and PWM control)

Time=5 µs/div

Time=2 µs/div

VSW=5 V/div

VOUT=50 mV/div

VSW=5 V/div

VOUT=50 mV/div

2: PWM control

Output Current: IOUT [A]

1: SLLMTM control