PT8A3281WEX Datasheet PT8A3281WEX, PT8A3285WE, PT8A3283WEX | P1-P3

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Heating Controller

12-07-0006 PT0261-1 07/06/12

1

PT8A3280/1/2/3/4/5/6/7

Features

 Dual Voltage (120V/240V) operations

 Auto temperature control with NTC

 NTC open protection

 Multi mode LED indicator

 Proportional control

 Pulse trigger for high current SCR/TRIAC (up to

15mA)

 Internal Zener

 Auto Heating off after heating timer timeout

 Low cost 8-Pin DIP and SOIC package

Applications

 Curler

 Straightener

Description

The PT8A3280/1/2/3/4/5/6/7 is a mixed signal

CMOS LSI chip designed as heating controller with help

of external NTC (Negative Temperature Component).

NTC open protection is implemented for device safety.

This device can be used in both 120V and 240V power

line supplier, as it will automatically adjust the heating

power according to the power line voltage to avoid

heating appliance damage or long heating time. The

proportional control algorithm is designed in this

product.

Pin Configuration

NTC1

NTC2

CLK

GND ON

GATE

OFF

VDD1

2

3

4 5

6

7

8

PT8A3270/1/2/3

NTC1

NTC2

CLK

GND ON/OFF

GATE

LED2

VDD1

2

3

4 5

6

7

8

PT8A3274/5/6/7

NTC1

NTC2

CLK

GND ON/OFF

GATE

TURBO

VDD1

2

3

4 5

6

7

8

PT8A3278/9

NTC1

NTC2

CLK

GND LED1

GATE

LED2

VDD1

2

3

4 5

6

7

8

PT8A3280/1/2/3

PT8A3290/1/2/3 PT8A3294/5/6/7 PT8A3288/9 PT8A3284/5/6/7

Pin Description

Pin No.

Pin Name

I/O

Description

1

NTC1

I

NTC voltage input, NTC open detection input

2

NTC2

O

Output signal for NTC open detection

3

CLK

I

Clock input from power line

4

GND

Power

Ground and Power

5

LED1

I/O

3280/1/2/3/4/5/6/7: LED1 driving output

6

GATE

O

3280/1/2/3: SCR trigger output

3284/5/6/7: TRIAC trigger output

7

LED2

I/O

3280/1/2/3/4/5/6/7: LED2 driving output

8

VDD

Power

Ground and Power

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12-07-0006 PT0261-1 07/06/12

2

PT8A3280/1/2/3/4/5/6/7

Heating Controller

Block Diagram

5bit ADC

Controller

NTC2

NTC1

CLK

GATE

OFF/TURBO/LED2

ON/ON_OFF/LED1

Maximum Ratings

Storage Temperature ................................................................................... -65

o

C to +150

o

C

Supply Voltage to Ground Potential (Input & V

CC

Only) ....................... -0.5V to + 5.5V

Supply Voltage to Ground Potential (Outputs) .......................................... -0.5V to + 5.5V

DC Input Voltage ............................................................................................ -0.5V to + 5.5V

DC Output Current ...................................................................... 20mA

Power Dissipation ......................................................................................................... 500mW

Recommended operation conditions

Symbol

Parameter

Min

Typ

Max

Unit

Frequency

CLK

Input CLK Frequency

-

50/60

-

Hz

T

A

-

Operating temperature

-20

-

85

℃

AC Electrical Characteristics

(V

DD

= 3.5 ~ 5.5V, T

A

= -20 ~ 85ºC, unless otherwise noted)

Symbo

l

Description

Test Conditions

Min

Type

Max

Unit

F

CLK

Frequency of CLK

-

50/60

Hz

T

GATE

Width of trigger pulse

-

160

200

240

S

Timer

Power off timer

F

CLK

= 50Hz

1.15

1.2

1.25

Hour

Precise

ADC

LED2

LED1

Note:

Stresses greater than those listed under MAXIMUM

RATINGS may cause permanent damage to the

device. This is a stress rating only and functional

operation of the device at these or any other condi-

tions above those indicated in the operational sec-

tions of this specification is not implied. Exposure

to absolute maximum rating conditions for extended

periods may affect reliability.

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12-07-0006 PT0261-1 07/06/12

3

PT8A3280/1/2/3/4/5/6/7

Heating Controller

DC Electrical Characteristics

(V

DD

= 3.5 ~ 5.5V, T

A

= -20 ~ 85ºC, unless otherwise noted)

Symbo

l

Description

Test Conditions

Min

Type

Max

Unit

I

IH

Input high current

PIN: CLK

V

IN

= V

DD

-

1

A

PIN: NTC1

V

IN

= V

DD

-

100

nA

PIN: NTC2

V

IN

= V

DD

,Output

High impedance

-

100

nA

I

IL

Input low current

PIN: CLK

V

IN

= GND

-

-1

A

V

IN

= 0.35V

-

-10

A

PIN: NTC1

V

IN

= GND

-

-100

nA

PIN: NTC2

V

IN

= GND, Output

High impedance

-

-100

nA

I

OH

Output High current

PIN: GATE

V

DD

=4.5V

Vout = 2.5V

-15

-

mA

I

OL

Output Low current

PIN: NTC2

V

DD

=4.5V

Vout =0.5V

2.0

-

mA

PIN: GATE

V

DD

=4.5V

Vout =0.5V

5.0

-

mA

V

POR

Voltage of POR

-

1.5

-

2.5

V

Z

Voltage of Zener

I

DD

= 500uA ~ 10mA

4.5

5.0

5.5

V

I

DD

Current consumption

NTC1,CLK pin tied to ground

V

DD

= 4.5V

-

500

A

PT8A3281WEX

PT8A3281WEX

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