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Heating Controller
Features
Description
Dual Voltage (120V/240V) operations
Auto temperature control with NTC
The PT8A3290/1/2/3/4/5/6/7 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.
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
Pin Information
Applications
PT8A3270/1/2/3
PT8A3290/1/2/3
PT8A3274/5/6/7
PT8A3294/5/6/7
Curler
NTC1
NTC2
CLK
1
2
3
4
8
7
6
5
VDD
OFF
GATE
ON
NTC1
NTC2
CLK
1
2
3
4
8
7
6
5
VDD
Straightener
LED2
GATE
ON/OFF
GND
GND
Pin Description
Pin Name
Pin No.
I/O
Description
3290/1/2/3
NTC1
NTC2
CLK
3294/5/6/7
NTC1
NTC2
CLK
1
2
3
4
5
6
7
8
I
O
I
NTC voltage input, NTC open detection input
Output signal for NTC open detection
Clock input from power line
GND
GND
Power Ground and Power
3290/1/2/3: Heating-on button input. and LED1 driving output
3294/5/6/7: Heating-on/off button input and LED1 driving output
ON
ON_OFF
GATE
LED2
I/O
O
GATE
OFF
TRIAC trigger output
3290/1/2/3: Heating-off button input and LED2 driving output
3294/5/6/7: LED2 driving output
I/O
VDD
VDD
Power Ground and Power
12-07-0006
PT0262-1 07/06/12
1