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PDF PT8A3274 Data sheet ( Hoja de datos )
| Número de pieza | PT8A3274 | |
| Descripción | Heating Controller | |
| Fabricantes | Pericom Semiconductor | |
| Logotipo |  |
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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
1 page  
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PT8A3270/1/2/3/4/5/6/7
Heating Controller
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Functional Description
State description
Reset
The device will be of reset state after power-on.
Heating on
The device will be of heating on state after heating-on button is on
Heating off
This device enter heating-off state after its power-on reset or heating timer timeout, and all pins will be the same status as after
power-on reset.
NTC open protection
When NTC is open, NTC1 pin will be pulled low in the period of NTC open detected.
Timer
Once IC enters Heating-on State, internal timer starts to count. When time is out after 216000 clock period, it will exit heating-on
state. That is, in case of 60Hz CLK signal, the heating time is about 1 hour; and 1.2 hour for 50Hz.
In heating-on state, temperature is regulated to the selected temperature by the IC through NTC close control loop.
Control signal output
When working in Heating-on state, Gate/LED output will be related to NTC1 input and CLK input amplitude.
Effect of NTC and VTCLK (Level 2) on GATE and LED indication
Workin CLK input
g State voltage
NTC
(NTC open
detection)
NTC
(Normal temp
detection)
GATE
(trigger to
SCR/TRIAC)
LED1
3270/2/4/6
LED
LED2
LED1
3270/2/4/6 3271/3/5/7
High for
level 2
0 ~ VADC_BIT15
V ADC_BIT14 ~
V ADC_BIT1
Proportional
output
Flash1*
On
(240V)
V ADC_BIT1 ~
0
On
ON
Low for
V NTCO~
VDD
VDD
0 ~ VADC_BIT15
V ADC_BIT14 ~
Proportional
output
Flash1
On
Invert of
LED1
level 2
V ADC_BIT1
(120V)
V ADC_BIT1 ~
VDD
0
On
Off X*
X 0 Off
On
On
On
On
On
On
Off
X X 0~V NTCO X
0 Flash2*
*Note: 1) X means any input. 2) Flash1 frequency is 1/32 clock. 3) Flash2 frequency is 1/8 clock
Flash2*
LED2
3271/3/5/7
Off
On
On
Off
On
On
Off
Off
12-07-0006
PT0257-1 07/06/12
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet PT8A3274.PDF ] | |
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