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부품번호 OM1895 기능
기능 Simmerstat Control IC
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OM1895 데이터시트, 핀배열, 회로
Draft Data Sheet
INTEGRATED CIRCUIT
2003 May 09
OM1895
ww.DataSheet4U.comSimmerstat control IC
wINTEGRATED ELECTRONIC SOLUTIONS
1BUTLER DRIVE
HENDON SA 5014
AUSTRALIA
www.DataSheet4U.com




OM1895 pdf, 반도체, 판매, 대치품
Integrated Electronic Solutions, Hendon, South Australia
Simmerstat control IC
Draft Data Sheet
OM1895
4 PINNING INFORMATION
4.1 Pin description
SYMBOL
PWR
POT
MODE
VEE
PX
TRG
VCC
RESET
PIN
1
2
3
4
5
6
7
8
DESCRIPTION
AC line sense and power input
Control input, triac ON/OFF
Triac ON/OFF & function
Negative supply
Gate pulse extender
Triac gate drive
Positive Common
Reset input/output
4.2 Pinning layout
PWR 1
8 RESET
POT 2
MODE 3
OM1895
7 VCC
6 TRG
VEE 4
5 PX
pin1895
Fig.1 Pin configuration
5 BLOCK DIAGRAM
ZAP1 ZAP2
TP1
MODE POT
TP2
Pre-scaler
cyclic period
RESET
Reset control
Stabilized DC
power supply
VEE
VCC
2003 May 09
Triac ON/OFF
control input
Triac gate drive
TRG
Cycle timing and
synchronization
Gate zero cross
monitoring, and
drive pulse width
PX
Power supply
rectifier
PWR
Fig.2 Block diagram
4
Mains
zero-crossing
detector
block1895

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OM1895 전자부품, 판매, 대치품
Integrated Electronic Solutions, Hendon, South Australia
Simmerstat control IC
Draft Data Sheet
OM1895
6.6 POT Triac drive control
input
When POT pin is connected to VCC,
then the triac is turned ON 100%.
When POT pin is left unconnected or
is connected to 1.2V with respect to
VEE, then the triac is fully OFF.
Figure 4 shows the characteristic of
duty cycle against POT voltage.
The OM1895 generates an internal
reference voltage signal which
consists of 32 voltage levels, ranging
from typically 7.79V down to 1.3V
(2Vbe) with respect to VEE. The
OM1895 compares the generated
reference voltage signal with the
voltage signal set on the POT pin,
which turns the triac ON when the
voltage set on POT pin is greater than
the reference voltage, and OFF when
the voltage set on POT pin is less
than or is equal to the reference
voltage.
Additional cycling period can be
achieved to extend the triac ON/OFF
period by grounding the appropriate
ZAP1 and ZAP2 internal pins to VEE.
ZAP1 and ZAP2 internal pins are
permanently wired during pretest.
When ZAP1, ZAP2 pins are not
connected, cycling time is 0.64
seconds. If ZAP1 pin not connected
and ZAP2 pin is connected to VEE,
cycling time is 5.12 seconds. While if
ZAP1 pin is connected to VEE and
ZAP2 pin not connected, cycling time
is 40.96 seconds. Finally, if ZAP1 and
ZAP2 pins are both connected to VEE,
cycling time is 327.68 seconds or
5.46 minutes.
The voltage signals on POT and
MODE pins will switch the triac ON or
OFF in a manner which is
synchronised to the mains zero
crossings. These signals may change
at any time, but the triac will only be
switched ON or permitted to turn
OFF, at a time that is consistent with
controlling it at the first available
opportunity consistent with the cycling
algorithm which triggers the triac for
an odd number cycles in each ON
period, and lets it remain OFF for and
even number of half cycles. In this
way there is no DC current present in
the mains supply when it is averaged
over a large number of ON cycles and
at the same time for inductive loads, a
new ON period begins on a half wave
of the opposite polarity to the start
and finish half wave of the previous
run cycle.
6.7 TRG Triac gate drive
The triac gate output drives the gate
through an external current setting
resistor. It has in-built protection to
withstand transient voltage signals
which may be induced on the gate of
the triac by mains transients during
firing. The gate drive current should
be set to a value suited to the gate
sensitivity of the triac used. The firing
pulse width will need to be of such a
width that the specified latching
current of the triac when used with the
design load has been reached before
the gate pulse ends.
In the OM1895 the gate drive is first
applied at the start of an ON period at
the zero crossing of the mains supply.
The leading edge of this obtained
from the signal derived from the PWR
resistor network before the falling
mains voltage reaches zero.
On this first half cycle current is
flowing in the triac, and subsequent
zero crossings of the triac can be
determined in another way. While a
resistive load may have the zero
crossing determined from the mains
supply, this is not possible when the
load is inductive (for example, when it
is a motor). The current is no longer in
phase with the supply voltage, and
can reach zero at a time significantly
lagging the supply voltage phase.
In the OM1895, the voltage of the
triac gate has been found to provide
an indicator of imminent zero
crossing, and with an appropriate
threshold circuit, the gate drive can be
re-applied before the triac turns fully
off. Again the gate pulse is
determined by the length of the
internal delay circuit, plus any
additional delay from the application
of external resistor and capacitors
applied in parallel from the pin PX to
VEE
6.8 PX triac gate pulse width
external setting
The gate pulse must be wide enough
to be applied from the time the triac is
about to turn off until the increasing
current in the triac in the opposite
direction has reached the latching
current of the triac being used.
While there is a time delay circuit
within the OM1895 to provide a
minimum gate pulse width of typically
100µs, for lower powered loads,
where it takes longer for the load
current to reach the triac latching
current, then it may be necessary to
extend the gate pulse.
A parallel resistor and capacitor are
connected from pin PX (pulse
extender) to VEE giving a pulse
extension time of:
tpw 1.4 R C
(s)
The gate pulse is applied for a time
determined by either the internal
delay time of typically 100µs or the
extended time, set by the RC network
on the PX pin, whichever is greater.
2003 May 09
7

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