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12-07-0006 PT0258-1 07/06/12
5
PT8A330x
Ceramic Heating Controller
Function description
Input Button
One key: (Only for PT8A3304/5/6/7(H/L))
The PTC input will toggle Heating-on and Heating-off
key function. Once Heating-on the heater will rise to
the desired temperature.
Two key: (Only for PT8A3300/1/2/3(H/L))
Have two buttons to toggle Heating-on and Heating-
off respectively.
One LED Indicator
Flash: (Only for PT8A3300/2/4/6)
When turn -on, the LED will flash (1.5Hz @50Hz
power CLK) to indicate the heater is being heated, and
keep lighting while reaching the desired temperature
Constant (Only for PT8A3301/3/5/7)
The LED will keep lighting after turn-on
Reset
After power on the chip will be reset by POR circuit,
LED is disabled. GATE is low level.
Timer
Once push down the ON button and without pushing
down the OFF button during the heating-on state, the
internal timer will start to count ,After 216000 clock
period, the IC will power off the heater until pushing
down the ON button again. For the 60Hz CLK signal,
the maximal heating time is about 1 hour; and 1.2 hour
for 50Hz ( for PT8A3300/1/4/5).
High Current pulse triggering for SCR
Tal_GATE
LINE 50Hz
POWER
200uS
a. High trigger peak current (>15mA), enough to trigger 20A SCR
b. Pulse triggering current to reduce the false self trigger by the leakage of SCR at high temperature environment.
c. Tal_GATE = 200us
Timing
