BL9382 参数 Datasheet PDF下载

BL9382

Switching waveform Vin=5V, Iout=0

VOUT

VIN

Switching waveform Vin=5V, Iout=2A

VOUT

VIN

SW

I_L

SW

I_L

FUNCTIONAL DECRIPTIONS

Loop Operation

The BL9382 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to

2A of output current, integrated with a 110m synchronous MOSFET, eliminating the need for external diode. It uses a

PWM current-mode control scheme. An error amplifier integrates error between the FB signal and the internal reference

voltage. The output of the integrator is then compared to the sum of a current-sense signal and the slope compensation

ramp. This operation generates a PWM signal that modulates the duty cycle of the power MOSFETs to achieve regulation

for output voltage.

Current Limit

There is a cycle-by-cycle current limit on the high-side MOSFET of 3A(typ). When the current flowing out of SW exceeds

this limit, the high-side MOSFET turns off and the synchronous rectifier turns on. Unlike the traditional method of

current limiting by limiting the voltage at the compensation pin, which usually has large variation due to duty cycle

variance, this type of peak current limiting scheme provides a relatively more accurate limit for output current, thereby

lowering the requirements for system design.

Faster Transient Response

Normally, people use 3.3nF and 5.6Kohm RC for compensation to keep the loop stable. However, if one needs to have

faster load transient response, 3.3nF and 8.5Kohm is recommended.

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