TERMINAL ASSIGNMENTS

Pin Name

I/O

Description

GND

P

Ground

FB

I

Feedback input pin. The PWM duty cycle is determined by voltage level into this pin

and SENSE pin input.

RI

I

Internal Oscillator frequency setting pin. A resistor connected between RI and GND

sets the PWM frequency.

SENSE

I

Current sense input pin. Connected to MOSFET current sensing resistor node.

VDD

P

Chip DC power supply pin.

GATE

O

Totem-pole gate drive output for the power MOSFET.

RECOMMENDED OPERATING CONDITION

Symbol

Parameter

Min － Max

Unit

VDD

VDD Supply Voltage

10 to 30

V

RI

RI Resistor Value

100

Kohm

Operating Ambient Temperature

-20 to 85

ELECTRICAL CHARACTERISTICS

(TA = 25OC if not otherwise noted)

Symbol

Parameter

Test Conditions

Min

Typ

Max

Unit

Supply Voltage (VDD)

I_VDD_Startup

VDD Start up

Current

VDD =12.5V, RI=100K

Measure Leakage

current into VDD

3

20

uA

I_VDD_Ops

Operation Current

VDD=16V,

1.4

mA

UVLO(ON)

VDD Under Voltage Lockout Enter

7.5

8.5

9.5

V

UVLO(OFF)

VDD Under Voltage Lockout Exit

(Recovery)

13.5 14.5

15.5 V

VDD_Clamp

VDD Zener Clamp Voltage

34

V

Feedback Input Section(FB Pin)

PWM Input Gain

Δ

2.0

V/V

4.8

V

FB pin short circuit current

Short FB pin to GND

and measure current

1

mA

AMS 2263

4

Advanced Monolithic Systems http://www.ams-semitech.com