MP4655–PURE, SINGLE-STAGE, LLC, LED CURRENT AND SYSTEM VOLTAGE CONTROLLER

MP4655 Rev 1.0

www.MonolithicPower.com

9

2/2/2016

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© 2016 MPS. All Rights Reserved.

Parameter

Symbol

Condition

Min

Typ

Max

Units

Burst Mode (Pulse Skipping) Threshold in Standby Mode (VCOMP, VFB)

VFB threshold to stop gate

driver

1.05

VFB threshold to recover gate

driver

0.95

FSET voltage at standby mode

VFSET _STB

PS_ON < 0.7V,

VFB = 0.8 * VREF_VFB

2.1

V

VSS low clamp value

0.91

V

VSS soft-on recovery current

100

µA

VSS soft-off recovery current

100

µA

System Voltage Protection (VFB)

Overbus

voltage

protection

threshold

1.25

Delay time

VFB > 1.5V

7

µs

VFB open protection threshold

50%

Duration time for VFB open

protection

VCOMP saturated at PWM

off or DCOMP saturated at

PWM ON

512

cycles

LED Stage Over-Current Detection (IOCP/FAULT)

IOCP threshold

-360

-320

-280

mV

IOCP detection delay time

IOCP < -310mV

7

µs

IOCP duration time to latch up

LLC

LED driver stage

protection triggered and

IOCP < -300mV

270

µs

Amplitude of output fault signal

Pin floated, fault condition

3.2

3.4

3.6

V

Pull-up resistance at fault

condition

0.3

kΩ

Source current of ICOP at

normal operation

5

µA

NOTES:

5) The parameters are tested on the bench with several parts.

6) VIFB_REF is the reference voltage for IFB. Its value changes according to the ADIM signal.