NCP4353, NCP4354

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4

PIN FUNCTION DESCRIPTION

NCP4353A

NCP4353B

NCP4354A

NCP4354B

Pin Name

Description

1

1

8

8

VCC

Supply voltage pin

2

2

7

7

GND

Ground

6

6

1

1

VSNS

Output voltage sensing pin, connected to output

voltage divider

5

5

2

2

OFFDET

OFF mode detection input. Voltage divider

provides adjustable off mode detection threshold

−

4

3

3

VMIN

Minimum output voltage adjustment

4

−

4

−

ISNS

Current sensing input for output current regulation,

connect it to shunt resistor in ground branch.

−

−

5

4

LED

PWM LED driver output. Connected to LED cath-

ode with current define by external serial resist-

ance

−

−

−

6

FBC

Output of current sinking OTA amplifier or amplifi-

ers driving feedback optocoupler’s LED. Connect

here compensation network (networks) as well.

−

−

−

5

ON/OFF

OFF mode current sink. This output keeps primary

control pin at low level in off mode.

3

3

6

−

DRIVE

Combination of FBC and ON/OFF pins

ABSOLUTE MAXIMUM RATINGS

Rating

Symbol

Value

Unit

Input Voltage

−0.3 to 40

V

DRIVE, ON/OFF, FBC, LED Voltage

V

VSNS, ISNS, OFFDET, VMIN Voltage

−0.3 to 10

V

LED Current

10

mA

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

NCP4353A

NCP4353B

NCP4354A

NCP4354B

315

324

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.