Document
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Features
PT8A3270/1/2/3/4/5/6/7
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Heating Controller
Description
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 Internal Zener Auto Heating off after heating timer timeout Low cost 8-Pin DIP and SOIC package
Applications
Curler Straightener
The PT8A3270/1/2/3/4/5/6/7 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
PT 8A3270/1/2/3 PT 8A3290/1/2/3
PT 8A3274/5/6/7 PT 8A3294/5/6/7
P P
NTC1 NTC2 CLK GND
1 2 3 4
8 VDD NTC1 1
7 OFF
NTC2 2
6 GATE CLK 3
5 ON
GND 4
8 VDD
NTC1
7 LED2
NTC2
6 GATE
CLK
5 ON/OFF GND
Pin Description
Pin No.
Pin Name 3270/1/2/3 3274/5/6/7
1
NTC1
NTC1
2
NTC2
NTC2
3 CLK CLK
4 GND GND
5 ON ON_OFF
6
GATE
GATE
7 OFF LED2
8 VDD VDD
I/O Description
I NTC voltage input, NTC open detection input
O Output signal for NTC open detection
I Clock input from power line
Power I/O O I/O
Power
Ground and Power
3270/1/2/3: Heating-on button input. and LED1 driving output 3274/5/6/7: Heating-on/off button input and LED1 driving output
3270/1/2/3/4/5/6/7: SCR trigger output
3270/1/2/3: Heating-off button input and LED2 driving output 3274/5/6/7: LED2 driving output
Ground and Power
12-07-0006
PT0257-1 07/06/12 1
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Block Diagram
PT8A3270/1/2/3/4/5/6/7 Heating Controller
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NTC1
5Pbriet cAiDseC ADC
OOFFFF/T/LUERDBO2/LED2
NTC2
Controller
GATE
CLK ON/ON_OFF/LED1
Maximum Ratings
StorageTemperature...................................................................................-65oC to +150oC SupplyVoltage to Ground Potential(Input & VCC Only).......................-0.5Vto +5.5V SupplyVoltage to Ground Potential(Outputs)..........................................-0.5Vto +5.5V DC Input Voltage ............................................................................................-0.5Vto +5.5V DC Out.