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PT8A3280/1/2/3/4/5/6/7
Heating Controller
Features
Description
The PT8A3280/1/2/3/4/5/6/7 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/TRIAC (up to
15mA)
Internal Zener
Auto Heating off after heating timer timeout
Low cost 8-Pin DIP and SOIC package
Applications
PT 8A3270/1/2/3
PT 8A3290/1/2/3
Curler
1
2
3
4
Pin Configuration
PT 8A3274/5/6/7
PT 8A3294/5/6/7
NTC1
NTC2
CLK
GND
1
2
3
4
8
7
6
5
VDD
LED2
GATE
ON/OFF
NTC1
NTC2
CLK
GND
PT 8A3278/9
PT 8A3288/9
1
2
3
4
8
7
6
5
VDD
TURBO
GATE
ON/OFF
NTC1
NTC2
CLK
GND
PT 8A3280/1/2/3
PT 8A3284/5/6/7
1
2
3
4
8
7
6
5
VDD
LED2
GATE
LED1
C1
8
VDD
Straightener
7
6
5
OFF
GATE
ON
C2
K
D
Pin Description
Pin No.
1
2
3
4
5
6
7
8
Pin Name
NTC1
NTC2
CLK
GND
LED1
GATE
LED2
VDD
I/O
I
O
I
Power
I/O
O
I/O
Power
Description
NTC voltage input, NTC open detection input
Output signal for NTC open detection
Clock input from power line
Ground and Power
3280/1/2/3/4/5/6/7:
LED1 driving output
3280/1/2/3:
SCR trigger output
3284/5/6/7:
TRIAC trigger output
3280/1/2/3/4/5/6/7:
LED2 driving output
Ground and Power
12-07-0006
1
PT0261-1
07/06/12
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PT8A3280/1/2/3/4/5/6/7
Heating Controller
Block Diagram
NTC1
Precise
5bit ADC
ADC
OFF/TURBO/LED2
LED2
NTC2
Controller
GATE
CLK
ON/ON_OFF/LED1
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.
Recommended operation conditions
Symbol
Frequency
T
A
Pin
CLK
-
Parameter
Input CLK Frequency
Operating temperature
Min
-
-20
Typ
50/60
-
Max
-
85
Unit
Hz
℃
AC Electrical Characteristics
(V
DD
= 3.5 ~ 5.5V, T
A
= -20 ~ 85º unless otherwise noted)
C,
Symbo
l
F
CLK
T
GATE
Timer
Description
Frequency of CLK
Width of trigger pulse
Power off timer
Test Conditions
-
-
F
CLK
= 50Hz
160
1.15
Min
Type
50/60
200
1.2
240
1.25
Max
Unit
Hz
S
Hour
12-07-0006
2
PT0261-1
07/06/12
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PT8A3280/1/2/3/4/5/6/7
Heating Controller
DC Electrical Characteristics
(V
DD
= 3.5 ~ 5.5V, T
A
= -20 ~ 85º unless otherwise noted)
C,
Symbo
l
Description
Test Conditions
PIN: CLK
I
IH
Input high current
PIN: NTC1
PIN: NTC2
PIN: CLK
I
IL
Input low current
V
IN
= V
DD
V
IN
= V
DD
V
IN
= V
DD
,Output
High impedance
V
IN
= GND
V
IN
= 0.35V
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
= 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
PT0261-1
07/06/12
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PT8A3280/1/2/3/4/5/6/7
Heating Controller
Functional Description
State description
Reset
The device will be of reset state after power-on.
Heating on
The device will be heating on after power 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
CLK
input
voltage
High
for
level 2
(240V)
NTC
(NTC open
detection)
NTC
(Normal temp
detection)
GATE
(trigger to
SCR/TRIAC)
LED
LED1
3280/2/4/6
Flash1*
LED2
3280/2/4/6
LED1
3281/3/5/7
On
On
On
On
On
On
Off
Flash2*
LED2
3281/3/5/7
Off
On
On
Off
On
On
Off
Off
Workin
g State
0 ~ V
ADC_BIT15
Proportional
V
ADC_BIT14
~
output
On
V
ADC_BIT1
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
4
PT0261-1
07/06/12
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PT8A3280/1/2/3/4/5/6/7
Heating Controller
Application Circuit
PT8A3280/1/2/3 Application circuit
L
43k(2W)
Heater
NTC
47u
RA
10k
LED2
PT 8A3280/1/2/3
NTC1
VDD
1M
RB
NTC2
LED2
OFF
SCR
100
CLK
GATE
GND
LED1
ON
8.2k
10n
0.1u
LED1
0.1u
N
PT8A3284/5/6/7 Application circuit
12-07-0006
5
PT0261-1
0.1u
07/06/12
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