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12-07-0006 PT0284-1 07/06/12
5
PT8A330xA/B
Ceramic Heat Controller
Function description
Input Button
No key: (Only for PT8A3300/1/2/3)
Auto start heating-on when power on.
One LED Indicator
Flash: (Only for PT8A3300/2)
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)
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 the IC power on, the internal timer will start to
count. After 216000 clock period, the IC will power
off the heater until power on reset again. For the 60Hz
CLK signal, the maximal heating time is about 1 hour;
and 1.2 hour for 50Hz (for PT8A3300/1).
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