NCP4355

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4

PIN FUNCTION DESCRIPTION

NCP4355A

NCP4355B

NCP4355C

Pin Name

Description

8

8

8

VCC

Supply voltage pin

7

7

7

GND

Ground

1

1

1

VSNS

Output voltage sensing pin, connected to output voltage divider

2

2

2

OFFDET

OFF mode detection input. Voltage divider provides adjustable off mode

detection threshold

−

3

3

VMIN

Minimum output voltage adjustment

3

−

4

ISNS

Current sensing input for output current regulation, connect it to shunt

resistor in ground branch.

4

4

−

LED

PWM LED driver output. Connected to LED cathode with current define by

external serial resistance

6

6

6

FBC

Output of current sinking OTA amplifier or amplifiers driving feedback op-

tocoupler’s LED. Connect here compensation network (networks) as well.

5

5

5

ON/OFF

ON mode current sink. This output keeps primary control pin at low level

in on mode.

ABSOLUTE MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Input Voltage

−0.3 to 40.0

V

ON/OFF, FBC, LED Voltage

V

VSNS, ISNS, OFFDET, VMIN Voltage

−0.3 to 10.0

V

LED Current

10

mA

Thermal Resistance − Junction−to−Air (Note 1)

NCP4355A/C

NCP4355B

260

277

°C/W

Junction Temperature

−40 to 150

°C

Storage Temperature

−60 to 150

°C

ESD Capability, Human Body Model (Note 2)

2000

V

ESD Capability, Machine Model (Note 2)

250

V

Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the

Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect

device reliability.

2. This device series incorporates ESD protection and is tested by the following methods:

ESD Human Body Model tested per JESD22−A114F

ESD Machine Model tested per JESD22−A115C

Latchup Current Maximum Rating tested per JEDEC standard: JESD78D.