FDMF3035 datasheet(14/21 Pages) ONSEMI

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Inductor

Current

PWM

GH to SW

VIH_PWM

VIL_PWM

3-State

Window

90%

10%

tPD_PHGLL

tD_DEADON

tPD_PLGHL

tD_DEADOFF

tPD_PHGLL

tD_DEADON

tD_HOLD-OFF

tPD_THGHH

tPD_TLGLH

Less than

tD_HOLD-OFF

Less than

tD_HOLD-OFF

3-State

tHOLD_OFF

Window

3-State

tHOLD_OFF

Window

GL / GH

off

GL / GH

off

tD_HOLD-OFF

90%

10%

Figure 28.

PWM 3-State Timing Diagram (FCCM held HIGH)

PWM

FCCM

DCM

CCM

(Neg. Inductor

Current)

VIL_PWM

VIH_FCCM

10%

VOUT

[ HS turn-on in DCM ]

Delay from PWM going HIGH

to HS VGS HIGH

GH to SW

VIH_PWM

Inductor

Current

DCM

CCM operation with

positive inductor current

CCM operation with

negative inductor current

DCM operation allowed:

Diode Emulation using the GL

(LS MOSFET VGS) to eliminate

negative inductor current

FCCM used

to control

negative

inductor

current

tPD_PHGHH

tPD_ZCD

Delay from FCCM going

HIGH to LS VGS HIGH

tPD_ZCD

Delay from FCCM going

HIGH to LS VGS HIGH

90%

10%

-0.5mV

(zoom)

VIN

DCM

VIL_FCCM

FCCM used to

place driver IC

is low power

shutdown

mode

CCM

tPS_EXIT

CCM

(Pos. Inductor

Current)

FCCM 3-State Timing Diagram

FDMF3035 Datasheet(PDF) 14 Page - ON Semiconductor

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