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5

BL8095

Switching waveform Vin=24V, Iout=0.5A

(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)

Switching waveform Vin=24V, Iout=1A

(CH1=Vin, CH2=Vout, CH3=SW, CH4=Isw)

Load Transient Response

Vin=12V, Iout=0.12 - 1A

(CH1=Vin, CH2=Vout, CH4=Isw)

Load Transient Response

Vin=24V, Iout=0.12 - 1A

(CH1=Vin, CH2=Vout, CH4=Isw)

FUNCTIONAL DECRIPTIONS

Loop Operation

The BL8095 is a wide input range, high-efficiency, DC-to-DC step-down switching regulator, capable of delivering up to

1.2A of output current, integrated with a 250m MOSFET, with external schottky 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 1.5A(typ). When the current flowing out of SW

exceeds this limit, the high-side MOSFET turns off and the external schottky diode rectifier turns on. Unlike the

traditional method of current limiting by limiting the voltage at the internal compensation node, 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.

Light Load Operation

Traditionally, a fixed current mode constant frequency PWM DC-DC regulator always switches even when the output

load is small. When energy is shuffling back and forth through the power MOSFETs, power is lost due to the finite