IR35201MTYPBF datasheet(33/60 Pages) IRF

33 / 60 page

8+0/7+1/6+2 Dual Output Digital Multi-Phase Controller

IR35201

February 8, 2015 | V1.6

PS0

Full Power

Maximum

PS1

Light Load 1-2Φ

<20A

PS2

1Φ Active Discontinuous

(Diode Emulation)

<5A

PS3

1Φ Passive Discontinuous

(Diode Emulation)

<1A

PS4

Output Voltage DVID or

Decay Down to zero

depending upon

configuration in

“ps4_dvid_or_decay”

registor. PWM signals of

all phases are tristated.

Near OFF

The Power States may be commanded through

I2C/PMBus, the SVID interface, or the IR35201 can

autonomously step through the Power States based

upon the regulator conditions as summarized in Table

23. PS4 can only be commanded with an SVID

command

IVID REGISTER

IVID efficiency registers are new additions to the

family of SVID registers of the IMVP8 specification.

When sent an SVID command associated with IVID

registers, IR35201 acknowledges the command and

stores the received information into the IVID registers.

However, IR35201 does not use the information

received in IVID registers for any purpose. Instead, it

uses the user set-up phase shed function to optimize

the VR’s efficiency across the entire operating current

range.

Table 23: Power State Entry/Exit

Command Mode

Auto Mode

PS1

Entry

a) Command

n/a if Phase Shed enabled

PS1

Exit

a) Command to PS0

b) DVID to PS0

c) Current limit to PS0

n/a if Phase Shed enabled

PS2

Entry

a) Command

Current level in 1Φ

PS2

Exit

a) Command to PS1/0

b) DVID to PS0

c) Current limit to PS0

Fsw > Fsw_desired

to PS0, DVID to PS0,

Current limit to PS0

PS3

Entry

a) Command

Current level in 1Φ

PS3

Exit

a) Command to PS2/1/0

b) DVID to PS0

c) Current limit to PS0

Fsw > Fsw_desired

to PS0, DVID to PS0,

Current limit to PS0

PS4

Entry

Command

n/a

PS4

In Single Mode- Any

n/a

Exit

SVID Clock Toggle.

In Multi Mode – Any

SetVID Command

DYNAMIC PHASE CONTROL (DPC) IN PS0

IR35201 optionally supports the ability to

autonomously adjust the number of phases with load

current, thus optimizing efficiency over a wide range

of loads.

The output current level at which a phase is added

can be programmed individually for each phase for

optimum results (Table 24).

TABLE 24: DPC THRESHOLDS

Function

Phase1_thresh

2Φ when I > Phase1_thresh

Phase2_delta

3Φ when I > Phase1_thresh +

Phase2_delta

Phase3_delta

4Φ when I > Phase1_thresh +

Phase2_delta+Phase3_delta

Phase4_delta

5Φ when I > Phase1_thresh +

Phase2_delta+Phase3_delta+

Phase4_delta

Phase5_delta

6Φ when I > Phase1_thresh +

Phase2_delta+Phase3_delta+

Phase4_delta+Phase5_delta

Phase6_delta

7Φ and 8Φ when I > Phase1_thresh +

Phase2_delta + Phase3_delta +

Phase4_delta + Phase5_delta +

Phase6_delta

As shown in Figure 33 (loop one, 8-phase example

shown), the designer can configure the VR to

dynamically add or shed phases as the load current

varies. Both control loops of the IR35201 have the

DPC feature.

Figure 33: Dynamic Phase Control Regions

8Ø

Per phase

Programmable

Threshold for Auto

Phase Shed

Load Current

3Ø

2Ø

1Ø

Programmable

Threshold for

Auto DCM

IR35201MTYPBF Datasheet(PDF) 33 Page - International Rectifier

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