TS2581

PWM Controller

2/7

Version: A11

Characteristics

Symbol

Conditions

Min. Typ. Max. Units

Feedback Voltage

0.98

1

1.02

V

Under Voltage Lockout

Falling

-

6

-

V

UVLO Hysteresis

-

-

0.8

-

V

OVP detect voltage

Internal define

1.07

1.1

1.13

V

Line Regulation

-

0.5

1

%

Load Regulation

-

30

50

mV

Quiescent Current

-

3

6

mA

Oscillator frequency

70

100

130

KHz

Max. Duty Cycle (ON)

DC

-

100

-

%

Min. Duty Cycle (OFF)

-

0

-

%

Sense Voltage

-

110

-

mV

EN/CT pin logic input threshold

voltage

Shutdown mode

-

-

0.4

V

Auto restart, VFB<0.4V

0.5

-

1.5

V

Thermal shutdown Temp

-

160

-

°C

Thermal

Shutdown Hysteresis

-

45

-

°C

Block Diagram

OSC.

+

+

Thermal

Shutdown

CONTROL

+

DRIVER

COMP.

GATE

COMP.

Current

limit

+

_

AMP

CURRENT

SOURCE

BIAS

1.23V

REFERENCE

2.5 V

REGULATOR

1.00V

110 mV

+

_

AMP

+

_

AMP

0.4V

SCP

OVP

Line

Compensation

VGATE

VCC

GND

FB

VSENSE

1.10V

START-UP and

Auto restart control

EN/CT

OVP

Pin Function Description

Name

Description

EN/CT

Shutdown and auto restart control pin

GND

GND pin

Driver gate clamping pin. The pin must connect a 1uF capacitor to VIN

Operating voltage input

GATE

Switch pin. Connect external inductor and diode here

Voltage Sense input

OVP

Over voltage detect pin

FB

Feedback pin