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PT8A3227x
Heating Controller
Features
Description
The PT8A3227x are mixed signal CMOS LSI chips
designed as heating controller with help of external NTC
(Negative
Temperature
Component).
NTC
open
Full power output at 120VAC and 240VAC
Auto temperature control with NTC
NTC open protection
Multi mode LED indicator
Pulse trigger for high current SCR/TRIAC (up to
100mA)
protection is implemented for device safety.
Auto Heating off after heating timer timeout
(1hour)
Internal Zener
Low cost 8-Pin DIP and SOIC package
Applications
Curler
Straightener
Pin Configuration
PT8A3227x
Pin Description
Part No.
NTC1
NTC2
CLK
LED1
GATE
LED2
GND
VDD
Pin No.
1
2
3
5
6
7
4
8
I/O
I
O
I
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
LED1 driving output
SCR/TRIAC trigger output
LED2 driving output
Ground and Power
12-07-0006
1
PT0355-1
07/06/12
PT8A3227x
Heating Controller
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Block Diagram
Precise
ADC
LED2
LED1
Maximum Ratings
Storage Temperature ................................................................................... -65oC to +150oC
Supply Voltage to Ground Potential (Input & V
DD
Only).......................-0.5V to + 5.5V
Supply Voltage to Ground Potential (Outputs Only) ...............................-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
(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
-
V
DD
=4.0~5.5V
F
CLK
= 50Hz/60Hz
Min
-
240
59
Type
50/60
300
60
Max
-
360
61
Unit
Hz
S
Minute
12-07-0006
2
PT0355-1
07/06/12
PT8A3227x
Heating Controller
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DC Electrical Characteristics
(V
DD
= 4.0 ~ 5.5, T
A
= -20 ~ 85º unless otherwise noted)
C,
Symbol
I
IH
Description
Input high current
PIN: CLK
PIN: NTC1
PIN: NTC2
PIN: CLK
PIN: NTC1
PIN: NTC2
Test Conditions
V
IN
= V
DD
V
IN
= V
DD
V
IN
= V
DD
,Output High
impedance
V
IN
= GND
V
IN
= GND
V
IN
= GND, Output High
impedance
V
DD
=4.5V,Vout =0.7V, pulse
following rise edge
V
DD
=4.5V,Vout = 0.7V, pulse
following fall edge
V
DD
=4.5V, Vout =1.9V
V
DD
= 4.5V, Vout = 3.1V
V
DD
=4.5V
Vout =0.5V
V
DD
=4.5V
Vout =0.5V
V
DD
= 4.5V, Vout =2.6V
V
DD
= 4.5V
V
DD
= 4.5V
V
DD
= 4.5V
-
VTL_Level
V
DD
=4.5V
VTL_CLK1
VTH_ CLK1
VTL_ CLK1
VTH_ CLK1
VTL_CLK2
VTH_CLK2
VTL_CLK2
VTH_CLK2
V
DD
= 4.5V
VT_Level2 is high
V
DD
= 4.5V
VT_Level2 is low
V
DD
= 4.5V
VT_Level2 is high
V
DD
=4.5V
VT_Level2 is low
Min
-
-
-
-
-
-
-3.5
-60
-1
-45
4.5
4.5
1
1.960
2.095
2.230
1.1
1.7
-180
-141
-135
-95
154
194
96
136
2.7
4.5
-
-
-
-
1.980
2.115
2.250
1.28
1.9
-226
-176
-168
-118
192
242
120
170
5.0
-
Type
-
-
-
-
-
-
-4.5
-75
-
Max
1
1
1
-1
-1
-1
-5.5
-
-
-180
-
-
-
2.000
2.135
2.270
1.4
2.1
-275
-211
-201
-141
230
290
144
204
3.7
5.5
500
Unit
A
A
A
A
A
A
mA
mA
mA
I
IL
Input low current
PIN: GATE
I
OH
Output High current
PIN: LED1
PIN:LED2
PIN: NTC2
I
OL
Output Low current
PIN: GATE
PIN: LED2
V
NTC1
V
NTC2
V
NTC3
V
NTCO
Input Voltage1 of NTC1 Pin
Input Voltage2 of NTC1 Pin
Input Voltage3 of NTC1 Pin
Input NTC open Voltage of
NTC1 Pin
Input Threshold Voltage of CLK
Pin for detect Power level
Input Threshold Voltage of CLK
Pin in CLK rise edge
A
mA
mA
mA
V
V
V
V
V
mV
mV
mV
mV
mV
mV
mV
mV
V
V
A
VT
CLK
Input Threshold Voltage of CLK
Pin in CLK fall edge
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
12-07-0006
3
PT0355-1
07/06/12
PT8A3227x
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 in heating-on state after power on.
Heating off
This device enters heating-off state after its power-on reset enabled or heating timer timeout.
NTC open protection
When NTC is open, NTC1 pin will be pulled low in the NTC open detection period.
Timer
If the timer is enabled, the IC will be auto heating-off after working 1 hour in any case of 50Hz and 60 Hz.
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)
0 ~ V
NTC1
V
NTC1
~V
DD
X
X
LED
Flash
Mode1
LED1
LED2
Flash1*
On
On
Flash1
Off
Off
Invert
Flash2*
LED1
No Flash
Mode1
LED1
LED2
On
Off
On
On
Off
Off
Invert
Flash2
LED1
Working
State
ON
Off
X
V
NTCO
~ V
DD
0~V
NTCO
*Note: 1) X means any input.
2) Flash1 frequency is 1/32 clock from pin CLK.
3) Flash2 frequency is 1/8 clock from pin CLK.
Working State
NTC
(NTC open detection)
NTC
(Normal temp detection)
0 ~ V
NTC1
V
NTC1
~ V
NTC2
V
NTC2
~ V
NTC3
V
NTC3
~ V
DD
X
X
GATE
(trigger to SCR/TRIAC)
100%
50%
25%
0
0
0
ON
V
NTCO
~ V
DD
Off
X
0~V
NTCO
12-07-0006
4
PT0355-1
07/06/12
PT8A3227x
Heating Controller
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Application Circuit
1.
Application circuit for PT8A3227x with TRIAC driving
1
2
3
D
k
1
R
1
A
L
33k/2W
1N4007
1
NTC
R
6.2K
A
Heater
VR1
1
0
R
3
K
U
1
M
1
1
NTC1
V
D
R
B
D
8
RED
HL2
Q
2
7
1
NTC2
B
1
0
k
LED2
R
6
1
0
3
6
0
C
L
K
GATE
3
R
4
4
G
N
D
8.2K
PT8A3227x
LED1
5
R
HL1
E
2.
Application circuit for PT8A3227x with SCR driving
C
1
2
3
N
D
k
1
R
1
33k/2W
1
D
D
L
A
1N4007
NTC
RL207
R
A
D
6.2K
Title
Heater
Size
VR1
1
0
K
HL2
A
R
3
U
1
RED
Date:
4
2009-9-28
Number
1
2
2
1
2
1
2
1
M
1
8
File:
E:\Work\..\3227.SchDoc
NTC1
V
D
1
2
D
R
B
2
NTC2
B
1
0
k
LED2
7
R
6
1
3
0
3
C
L
K
R
4
4
GATE
G
N
D
8.2K
PT8A3227x
LED1
5
6
0
R
HL1
E
C
N
12-07-0006
5
D
PT0355-1
Size
A
Date:
4
2009-9-28
Number
Title
D
07/06/12
Sheet
of
File:
SCR.SchDoc
E:\Work\..\3227
1
2
3
By:
Drawn
By:
Drawn
of
Sheet
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