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TSZ02201-0J4J0AJ00590-1-2

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TSZ22111

• 15 • 001

BD9106FVM-LB

21.Feb.2014 Rev.002

Description of Block

BD9106FVM-LB 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 SLLM

○Synchronous rectifier

It does not require the power to be dissipated by a rectifier externally connected to a conventional DC/DC converter IC,

and its P.N junction shoot-through protection circuit limits the shoot-through current during operation, by which the power

dissipation of the set is reduced.

○Current mode PWM control

Synthesizes a PWM control signal with a inductor current feedback loop added to the voltage feedback.

・PWM (Pulse Width Modulation) control

The oscillation frequency for PWM is 1 MHz.

SET signal form OSC turns ON a P-channel MOS FET (while a

The current comparator (Current Comp)

control signal (FB), and issues a RESET signal if both input signals are identical to each other, and turns OFF the

P-channel MOS FET (while a N-channel MOS FET is turned ON) for the rest of the fixed period.

The PWM control

repeat this operation.

Voltage drop due to sudden change in load was reduced by about 50%.

Figure 4. Comparison of transient response

Conventional product (VOUT of which is 3.3 volts)

228mV

110mV