- 34 -`

AUGUST08,2012|DATASHEET| Rev3.1

34

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

TYPICALOPERATINGWAVEFORMS

PVin=12V,Vo=1.2V,Iout=0‐12A,RoomTemperature,NoAirflow



Figure30:Startupat12ALoad,

Ch

1

:Vout,Ch

2

:Vin,Ch

3

:P

Good

Ch

4

:Enable



Figure32:StartupwithPreBiasVoltage,

0ALoad,Ch

1

:V

o



Figure34:Inductornodeat12Aload,Ch

1

:SWnode



Figure31:Startupat12ALoad,

Ch

1

:Vout,Ch

2

:Vin,Ch

3

:P

Good

,Ch

4

:V

cc



Figure33:OutputVoltageRipple,

12ALoad,Ch

1

:Vout



Figure35:ShortCircuitRecovery,

Ch

1

‐Vout,Ch

4

:Iout(5A/Div)



- 35 -`

AUGUST08,2012|DATASHEET| Rev3.1

35

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

TYPICALOPERATINGWAVEFORMS

Vin=12V,Vo=1.2V,Iout=0‐12A,RoomTemperature,NoAirFlow







Figure36:TurnonatNoLoadshowingVcclevel   Figure37:TurnonatNoLoadshowingVcclevel

Ch1‐Vout,Ch2‐Vin,Ch3‐Vcc,Ch4‐Inductorcurrent Ch1‐Vout,Ch2‐Vin,Ch3‐Vcc,Ch4‐Inductorcurrent



Figure38:TransientResponse,6Ato12Astep

at2.5A/uSecslewrate,

Ch

1

:V

out

,Ch4‐Iout(5A/Div)

- 36 -`

AUGUST08,2012|DATASHEET| Rev3.1

36

IR3894

12AHighlyIntegratedSupIRBuck

Single‐InputVoltage,SynchronousBuckRegulator

PD‐97745

TYPICALOPERATINGWAVEFORMS

PVin=12V,Vo=1.2V,Iout=0‐12A,RoomTemperature,NoAirflow



Figure39:FeedforwardforVinchangefrom6.8to16V,

Ch

1

:V

out

,Ch

4

:V

in



Figure41:Externalfrequencysynchronizationto800kHz

fromfreerunning600kHz,Ch

1

:V

o,

Ch2:Rt/Sync

voltage,Ch

3

:SWNodevoltage



Figure43:VoltagemarginingusingVrefpin



Ch

1

:Vout

,

Ch3:P

Good,

Ch

4

:V

ref



Figure40:Start/StopusingS_CtrlPin,

Ch

1

:V

out

,Ch

2

:Enable,Ch

3

:P

Good,

Ch

4

:S_Ctrl



Figure42:OverVoltageProtection,

Ch

1

:Vout,Ch

3

:PGood



Figure44:VoltagetrackingusingVppin

Ch

1

‐Vout,Ch3:P

Good

,Ch

4

:V

p



Part #	ERJ-3EKF1000V
Description	RES THKFLM 0603 100 OHM 1% 1/10W 100PPM/ C SMD - Cut TR (S
Category	CHIP RESISTOR
Availability	Out of Stock
Qty	0

ERJ-3EKF1000V

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