PT8A3270/1/2/3/4/5/6/7
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Heating Controller
Features
Description
Dual Voltage (120V/240V) operations
The PT8A3270/1/2/3/4/5/6/7 is a mixed signal
Auto temperature control with NTC
CMOS LSI chip designed as heating controller with help
NTC open protection
of external NTC (Negative Temperature Component).
Multi mode LED indicator
NTC open protection is implemented for device safety.
Proportional control
This device can be used in both 120V and 240V power
Pulse trigger for high current SCR
line supplier, as it will automatically adjust the heating
Internal Zener
power according to the power line voltage to avoid
Auto Heating off after heating timer timeout
heating appliance damage or long heating time. The
Low cost 8-Pin DIP and SOIC package
proportional control algorithm is designed in this
product.
Applications
Curler
Straightener
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
1
8
VDD
NTC1
1
8
VDD
NTC1
NTC2
2
7
OFF
NTC2
2
7
LED2
NTC2
CLK
3
6
GATE
CLK
3
6
GATE
CLK
GND
4
5
ON
GND
4
5
ON/OFF
GND
Pin Description
Pin Name
Pin No.
I/O
Description
3270/1/2/3
3274/5/6/7
1
NTC1
NTC1
I
NTC voltage input, NTC open detection input
2
NTC2
NTC2
O
Output signal for NTC open detection
3
CLK
CLK
I
Clock input from power line
4
GND
GND
Power
5
ON
ON_OFF
I/O
6
GATE
GATE
O
7
OFF
LED2
I/O
8
VDD
VDD
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
1
07/06/12
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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Block Diagram
NTC1
Precise
5bit
ADC
OFF/TURBO/LED2
OFF/LED2
ADC
GATE
Controller
NTC2
CLK
ON/ON_OFF/LED1
Maximum Ratings
Storage Temperature ................................................................................... -65oC to +150oC
Supply Voltage to Ground Potential (Input & VCC 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 conditions above those indicated in the operational sections of this specification is not implied. Exposure
to absolute maximum rating conditions for extended
periods may affect reliability.
Recommended operation conditions
Symbol
Pin
Parameter
Min
Typ
Max
Unit
Frequency
CLK
Input CLK Frequency
-
50/60
-
Hz
TA
-
Operating temperature
-20
-
85
℃
AC Electrical Characteristics
(VDD = 3.5 ~ 5.5V, TA = -20 ~ 85ºC, unless otherwise noted)
Symbol
Description
Test Conditions
Min
Type
Max
Unit
FCLK
Frequency of CLK
-
-
50/60
-
Hz
TGATE
Width of trigger pulse
-
160
200
240
S
Timer
Power off timer
1.15
1.2
1.25
Hour
PT0257-1
07/06/12
FCLK= 50Hz
12-07-0006
2
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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DC Electrical Characteristics
(VDD = 3.5 ~ 5.5V, TA = -20 ~ 85ºC, unless otherwise noted)
Symbol
Description
Min
Type
Max
Unit
VIN = VDD
-
-
1
A
PIN: NTC1
VIN = VDD
-
-
100
nA
PIN: NTC2
VIN = VDD ,Output
High impedance
-
-
100
nA
VIN = GND
-
-
-1
A
VIN = 0.35V
-
-
-10
A
VIN = GND
-
-
-100
nA
-
-
-100
nA
-15
-
-
mA
2.0
-
-
mA
5.0
-
-
mA
Test Conditions
PIN: CLK
IIH
Input high current
PIN: CLK
IIL
Input low current
PIN: NTC1
VIN = 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
PIN: NTC2
IOH
Output High current
IOL
Output Low current
PIN: GATE
PIN: NTC2
PIN: GATE
VPOR
Voltage of POR
-
1.5
-
2.5
V
VZ
Voltage of Zener
IDD= 500uA ~ 10mA
4.5
5.0
5.5
V
IDD
Current consumption
NTC1,CLK pin tied to ground
V DD = 4.5V
-
-
500
A
12-07-0006
PT0257-1
3
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
Heater
L
43k(2W)
47u
NTC
10k
RA
LED2
1M
PT 8A3270/1/2/3
NTC1
VDD
NTC2
OFF
OFF
20k
RB
SCR
100
CLK
GATE
GND
ON
0.1u
ON
0.1u
0.1u
10n
8.2k
20k
0.1u
0.1u
LED1
N
PT8A3274/5/6/7 Application circuit
Heater
L
43k(2W)
47u
NTC
10k
RA
LED2
1M
PT 8A3274/5/6/7
NTC1
VDD
NTC2
LED2
OFF
RB
SCR
100
CLK
GATE
GND
ON_OFF
ON
0.1u
LED1
0.1u
0.1u
0.1u
ON/OFF
10n
8.2k
20k
N
12-07-0006
PT0257-1
4
07/06/12
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
g State
CLK input
voltage
NTC
(NTC open
detection)
NTC
(Normal temp
detection)
GATE
(trigger to
SCR/TRIAC)
LED
LED1
LED2
3270/2/4/6
3270/2/4/6
0 ~ VADC_BIT15
Flash1*
Proportional
High for
V ADC_BIT14 ~
output
On
level 2
V ADC_BIT1
(240V)
V ADC_BIT1 ~
0
On
VDD
ON
V NTCO~
0 ~ VADC_BIT15
Flash1
Invert of
VDD
Proportional
LED1
Low for
V ADC_BIT14 ~
output
On
level 2
V ADC_BIT1
(120V)
V ADC_BIT1 ~
0
On
VDD
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
LED1
LED2
3271/3/5/7
On
3271/3/5/7
Off
On
On
On
On
On
Off
On
On
On
On
Off
Flash2*
Off
Off
PT0257-1
5
07/06/12
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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Mechanical Information
PE (DIP-8)
Symbol
A
A1
A2
B
B1
c
D
E
E1
e
L
E2
Note:
1) Controlling dimensions in millimeters.
2) Ref : JEDEC MS-001D/BA
12-07-0006
Dimensions In Millimeters
Min
Max
3.710
4.310
0.510
3.200
3.600
0.380
0.570
1.524 BSC
0.204
0.360
9.000
9.400
6.200
6.600
7.320
7.920
2.540 BSC
3.000
3.600
8.400
9.000
PT0257-1
6
07/06/12
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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WE (SOIC-8)
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
Note:
1) Controlling dimensions in millimeters.
2) Ref : JEDEC MS-012E/AA
12-07-0006
Dimensions In Millimeters
Min
Max
1.350
1.750
0.100
0.250
1.350
1.550
0.330
0.510
0.170
0.250
4.700
5.100
3.800
4.000
5.800
6.200
1.27 BSC
0.400
1.270
0°
8°
PT0257-1
7
07/06/12
PT8A3270/1/2/3/4/5/6/7
Heating Controller
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Ordering Information
Part No.
Package Code
Package
PT8A327xPE
P
Lead free 8-Pin DIP
PT8A327xWE
W
Lead free and Green 8-Pin SOIC
Note:
“x” shows 0~7 with different function see Function Comparison Table.
E = Pb-free or Pb-free & Green
Adding X Suffix= Tape/Reel
Function Comparison Table
Part number
LED
Timer
Switch
Driver
PT8A3270
Flash
Y
Two Key (ON + OFF)
SCR
PT8A3271*
Constant
Y
Two Key (ON + OFF)
SCR
PT8A3272*
Flash
N
Two Key (ON + OFF)
SCR
PT8A3273*
Constant
N
Two Key (ON + OFF)
SCR
PT8A3274
Flash
Y
One key (ON_OFF)
SCR
PT8A3275
Constant
Y
One key (ON_OFF)
SCR
PT8A3276*
Flash
N
One key (ON_OFF)
SCR
PT8A3277*
Constant
N
One key (ON_OFF)
SCR
Note:
*Contact Pericom for availability.
Pericom Semiconductor Corporation 1-800-435-2336 www.pericom.com
Pericom reserves the right to make changes to its products or specifications at any time, without notice, in order to improve design or performance and to supply
the best possible product. Pericom does not assume any responsibility for use of any circuitry described other than the circuitry embodied in Pericom product. The
company makes no representations that circuitry described herein is free from patent infringement or other rights, of Pericom.
12-07-0006
PT0257-1
8
07/06/12
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