PT8A3252 Datasheet, PDF (5/7 Pages) Pericom Semiconductor Corporation – 5LED Ceramic Heating Controller

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PT8A3252/54
5LED Ceramic Heating Controller
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Functional Description
 3 Input Buttons
On/Off: This button will toggle Heating-on or
Heating-off. Once heating-on, the level 1 of 130C
temperature setting always be selected.
Up: Temperature up adjustment button. Push Up-
button once, the temperature setting increases one
level until the highest level 5 is reached.
Down: Temperature down adjustment button. Push
Down-button once, the temperature setting reduces
one level until the lowest level 1is reached.
 Reset
After power on the chip will be reset by internal POR
circuit, LED1~ LED5 are all disabled. GATE and OT
PIN output are low level.
 Timer (only for PT8A3252)
Once IC enters Heating-on state, internal timer starts to
count. It timeouts and device will stop heating
automatically after 216000 clock period, ie. 1 hour for
60Hz and 1.2 hour for 50Hz.
 5 LED Indicator (Internal)
LED1: 130C temperature setting (level 1)
LED2: 145C temperature setting (level 2)
LED3: 160C temperature setting (level 3)
LED4: 175C temperature setting (level 4)
LED5: 190C temperature setting (level 5)
Note: The temperature range can be adjusted from
100C to 250C by external series resistance.
 Over-Heat Protection
Once heater loses control and reaches to 250C, the
Over-Heat protection function will be activated by
driving one SCR to melt the fuse immediately.
Application Circuit
0.47~2.0K
8.2~16K for 110V
5.6~12K for 220V
100
Level 1
RS1 39K
RS2 10K
Level 2
10K
10K
Level 3
10K
39K
RA, RB: Temperature adjustment.
RX: Overshoot adjustment.
RS: Recover sensitivity adjustment
RS1
RS2
12-07-0006
PT0233-1 07/06/12
5