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

MP4655 Rev 1.0

www.MonolithicPower.com

7

2/2/2016

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Parameter

Symbol

Condition

Min

Typ

Max

Units

Capacitive Mode Detection (CMODE)

CMODE detection high

threshold

At GL falling edge

0.97

CMODE detection low

threshold

At GR falling edge

0.03

FTH_CMODE voltage

1.15

1.2

1.25

V

CMODE threshold frequency

150kΩ on FTH_CMODE

91

kHz

Soft Start (SS)

Soft-start final voltage

Normal operation after

start-up

2.34

2.405

2.47

Soft-start current

13

μA

Discharge current when

capacitive mode detected

3

Pull low resistor at latch-up

120

Ω

LED Current Feedback (IFB)

Magnitude

0.188 0.199

0.21

V

LED short threshold for

immediate action

490

555

610

mV

LED short detection delay time

6

us

LED short threshold for slow

action

370

415

460

mV

Delay time for slow action

250

340

450

μs

Threshold for short protection

ICOMP saturated

50%

(6)

Duration for short protection

1024

cycle

Internal Current Loop Compensation Transconductance Op-Amp (ICOMP)

Transconductance

Gm_I

840

μA/V

Saturated output current

30

50

70

μA

Low-level clamp voltage

VICOMP_L

Normal operation

0.97

1.02

1.07

V

High-level clamp votlage

VICOMP_H

Normal operation

2.2

2.28

2.36

V

Output for System Voltage Feedback (VFB)

Reference voltage

1.17

1.2

1.23

V

Leakage current

Normal operation

0.33

μA

Internal Voltage Loop Compensation Transconductance Op-Amp (VCOMP)

Low-level clamp voltage

Normal operation

0.97

1.02

1.07

V

High-level clamp votlage

Normal operation

2.2

2.28

2.36

V

Transconductance

Gm_V

150

μA/V

Saturated output current

30

50

70

μA