AP3595

Document number: DS36749 Rev. 1 - 2

12 of 23

www.diodes.com

January 2014

© Diodes Incorporated

AP3595

A Product Line of

Diodes Incorporated

offset voltage of the current sensing circuit.

AP3595 tunes the duty cycle of each channel for current balance according to the sensed inductor current signals as shown in Figure 4. If the

current of channel 1 is smaller than the current of channel 2, the IC increases the duty cycle of the corresponding phase to increase its phase

current accordingly, vice versa.

Figure 4. Current Balance Scheme of AP3595

7. Power Saving Interface (PSI)

AP3595 will operate in single phase mode. There is 2ms delay at the transient from dual phase to single phase, and no delay time from single

phase to dual phase.

8. Current Sense by DCR

Figure 5. Output Current Sensing Block

as

2

/

DC

OUT

CS

R

I

V





,

If the following condition is true:

CS

CSP

DC

C

R

R

L





 /

2

current sensing.

CS

CSN

CSN

V

R

I





CSN

DC

OUT

CSN

R

R

I

I







2

+

_

+

_

PWM1

PWM2

COMP

+

_

+

RAMP1

RAMP2

AP3595

+

-

CSP

CSN

L

L

PHASE1

PHASE2

GM

Amplifier