PT8A3270 Datasheet, PDF (1/8 Pages) Pericom Semiconductor Corporation – Heating Controller

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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 8A3274/5/6/7
P
PT 8A3290/1/2/3
PT 8A3294/5/6/7
P
NTC1 1
NTC2 2
CLK
3
GND 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