MP4658 – 4-STRING, 80V RETURN LED DRIVER WITH AC/DC FEEDBACK

MP4658 Rev. 1.0

MonolithicPower.com

5

10/13/2021

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ELECTRICAL CHARACTERISTICS (continued)

VIN = 12V, TA = 25°C, unless otherwise noted.

Parameter

Symbol

Condition

Min

Typ

Max

Units

Saturated output current

ISAT_COMP1

90

μA

Low-level clamp voltage

VCOMP1_L

Normal operation

1

V

High-level clamp voltage

VCOMP1_H

Normal operation

2.5

V

Compensation Loop for LED (COMP2)

Gain bandwidth product

GB_COMP2

75pF on COMP2

1 (5)

MHz

Open-loop DC gain

AV_COMP2

COMP2 open

70 (5)

dB

Low-level clamp voltage

VCOMP2_L

Normal operation

1

V

High-level clamp voltage

VCOMP2_H

Normal operation

2.5

V

Transconductance when

PWM is off

GM_COMP2

PWM off

260

μA/V

Saturated output current

ISAT_COMP2

45

μA

LED Driver Protection (OVP, LED Open/Short)

OVP threshold

VTH_OVP

2.4

V

OVP threshold hysteresis

200

mV

OVP to latch IC threshold

3

V

LEDx threshold for open LED

string mark-off

OVP triggered

100

mV

LEDx over-voltage (OV)

threshold (for LED short

protection)

VTH_LEDxOV

5

V

LED short delay time

tD_LEDxOV

5

ms

Thermal protection threshold

150 (5)

°C

Thermal protection

hysteresis

25 (5)

°C

LED Current Regulation (VLEDx, ISET)

ISET voltage

VISET

1.53

1.58

1.63

V

LEDx average current

ILED

RISET = 32

0kΩ (trim)

-1.5%

50

+1.5%

mA

RISET = 320

kΩ (40%)

-3%

20.3

+3%

mA

Current matching

ILED = 50mA

0.3

2

%

RISET = 320k

Ω, ILED = 20mA

(40% of ADIM)

0.4

2.5

%

Minimum LEDx regulation

voltage

VLEDx

ILED = 200mA

560

mV

ILED = 1mA

176

mV

FF pin pull-down resistor

Open drain

270

Ω

Note:

5) Guaranteed by design. Not tested in production.