PT8A3270/1/2/3/4/5/6/7
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Heating Controller
Features
Description
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.
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
Pin Configuration
PT 8A3270/1/2/3
PT 8A3290/1/2/3
NTC1
NTC2
CLK
GND
1
2
3
4
8
7
6
5
VDD
OFF
GATE
ON
NTC1
NTC2
CLK
GND
PT 8A3274/5/6/7
PT 8A3294/5/6/7
1
2
3
4
8
7
6
5
VDD
LED2
GATE
ON/OFF
NTC1
NTC2
CLK
GND
P
P
Pin Description
Pin Name
Pin No.
3270/1/2/3
1
2
3
4
5
6
7
8
12-07-0006
1
NTC1
NTC2
CLK
GND
ON
GATE
OFF
VDD
3274/5/6/7
NTC1
NTC2
CLK
GND
ON_OFF
GATE
LED2
VDD
I
O
I
Power
I/O
O
I/O
Power
NTC voltage input, NTC open detection input
Output signal for NTC open detection
Clock input from power line
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
PT0257-1
07/06/12
I/O
Description
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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Block Diagram
NTC1
Precise
5bit ADC
ADC
OFF/TURBO/LED2
OFF/LED2
NTC2
Controller
GATE
CLK
ON/ON_OFF/LED1
Maximum Ratings
Storage Temperature ................................................................................... -65oC to +150oC
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
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.
Min
-
-20
Typ
50/60
-
Max
-
85
Unit
Hz
℃
Recommended operation conditions
Symbol
Frequency
T
A
Pin
CLK
-
Parameter
Input CLK Frequency
Operating temperature
AC Electrical Characteristics
(V
DD
= 3.5 ~ 5.5V, T
A
= -20 ~ 85º unless otherwise noted)
C,
Symbol
F
CLK
T
GATE
Timer
Description
Frequency of CLK
Width of trigger pulse
Power off timer
Test Conditions
-
-
F
CLK
= 50Hz
Min
-
160
1.15
Type
50/60
200
1.2
Max
-
240
1.25
Unit
Hz
S
Hour
12-07-0006
2
PT0257-1
07/06/12
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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DC Electrical Characteristics
(V
DD
= 3.5 ~ 5.5V, T
A
= -20 ~ 85º unless otherwise noted)
C,
Symbol
Description
Test Conditions
PIN: CLK
I
IH
Input high current
PIN: NTC1
PIN: NTC2
PIN: CLK
I
IL
Input low current
PIN: NTC1
PIN: NTC2
I
OH
Output High current
PIN: GATE
PIN: NTC2
I
OL
Output Low current
PIN: GATE
V
POR
V
Z
I
DD
Voltage of POR
Voltage of Zener
Current consumption
-
I
DD
= 500uA ~ 10mA
NTC1,CLK pin tied to ground
V
DD
= 4.5V
V
IN
= V
DD
V
IN
= V
DD
V
IN
= V
DD
,Output
High impedance
V
IN
= GND
V
IN
= 0.35V
V
IN
= GND
V
IN
= GND, Output
High impedance
V
DD
=4.5V
Vout = 2.5V
V
DD
=4.5V
Vout =0.5V
V
DD
=4.5V
Vout =0.5V
Min
-
-
-
-
-
-
-
-15
2.0
5.0
1.5
4.5
-
Type
-
-
-
-
-
-
-
-
-
-
-
5.0
-
Max
1
100
100
-1
-10
-100
-100
-
-
-
2.5
5.5
500
Unit
A
nA
nA
A
A
nA
nA
mA
mA
mA
V
V
A
12-07-0006
3
PT0257-1
07/06/12
PT8A3270/1/2/3/4/5/6/7
Heating Controller
|
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Application Circuit
PT8A3270/1/2/3 Application Circuit
L
43k(2W)
Heater
NTC
47u
RA
10k
LED2
PT 8A3270/1/2/3
NTC1
VDD
1M
RB
NTC2
OFF
20k
100
CLK
GATE
OFF
SCR
20k
GND
ON
0.1u
8.2k
10n
0.1u
LED1
0.1u
0.1u
N
PT8A3274/5/6/7 Application circuit
L
43k(2W)
Heater
NTC
47u
RA
10k
LED2
PT 8A3274/5/6/7
NTC1
VDD
1M
RB
NTC2
LED2
OFF
SCR
100
CLK
GATE
20k
GND
ON_OFF
ON
8.2k
10n
0.1u
0.1u
LED1
N
12-07-0006
4
PT0257-1
07/06/12
0.1u
0.1u
ON/OFF
0.1u
ON
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 VT
CLK
(Level 2) on GATE and LED indication
NTC
(NTC open
detection)
NTC
(Normal temp
detection)
GATE
(trigger to
SCR/TRIAC)
LED
LED1
3270/2/4/6
Flash1*
LED2
3270/2/4/6
LED1
3271/3/5/7
On
On
On
On
On
On
Off
Flash2*
LED2
3271/3/5/7
Off
On
On
Off
On
On
Off
Off
Workin
g State
CLK input
voltage
0 ~ V
ADC_BIT15
Proportional
High for
V
ADC_BIT14
~
output
On
level 2
V
ADC_BIT1
(240V)
V
ADC_BIT1
~
0
On
V
DD
ON
V
NTCO
~
0 ~ V
ADC_BIT15
Flash1
Invert of
V
DD
Proportional
LED1
Low for
V
ADC_BIT14
~
output
On
level 2
V
ADC_BIT1
(120V)
V
ADC_BIT1
~
0
On
V
DD
Off
X*
X
0
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
12-07-0006
5
PT0257-1
07/06/12
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