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IES5521A डेटा पत्रक PDF( Datasheet डाउनलोड )


डेटा पत्रक - Simple Zero Crossing Triac Control Circuit - IES

भाग संख्या IES5521A
समारोह Simple Zero Crossing Triac Control Circuit
मैन्युफैक्चरर्स IES 
लोगो IES लोगो 
पूर्व दर्शन
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<?=IES5521A?> डेटा पत्रक पीडीएफ

IES5521A pdf
Integrated Electronic Solutions
5 PINNING INFORMATION
5.1 Pinning layout (8 pin)
abbing IC’s fo
35Years
VEE 1
GATE 2
VCC 3
SENS 4
IES5521A
8 AC
7 PWR
6 CAP
5 RC
pin5521-8
Fig.2 Pinning diagram (DIL-8 and SO-8)
IES5521A
Simple Zero-Crossing Triac Control
Circuit with Adjustable Time-out
5.2 Pin description (8 pin)
SYMBOL
VEE
GATE
VCC
SENS
RC
CAP
PWR
AC
PIN
1
2
3
4
5
6
7
8
DESCRIPTION
Negative supply
Triac gate drive
Common, Positive supply
Temperature sense
RC oscillator input
Timing capacitor
Power supply input
Mains supply
6 FUNCTIONAL DESCRIPTION
6.1 VCC Common, positive DC
supply
The positive DC supply rail for the
control IC IES5521A is used as the
Common reference. This is
connected to the T1 terminal of the
triac, and being the positive supply
rail enables negative gate drive to the
triac in both positive and negative
supply half cycles on T2. By driving
the triac in this way the insensitive
quadrant (negative T2 voltage, and
positive gate triggering signal) is
avoided.
6.2 VEE Substrate, negative
DC supply
The substrate connection is the
negative DC power supply terminal of
the IES5521A. This should be
bypassed to VCC by a filtering
capacitor of 47 microfarads. The
operating voltage is typically 6.5
volts. This capacitor needs to be
sufficiently large to maintain the
operating voltage during the half cycle
when it is not being charged, as well
as to provide the energy to drive the
triac gate during the gate pulse.
6.3 AC AC signal, power
supply and synchronisation
For the IES5521A the AC input is
connected to the active mains supply
rail via a resistor chosen to give the
required gate pulse width, to ensure
that during zero crossing of the mains
cycle, the gate signal is applied from
before the load current falls below the
triac holding current, until after the
load current has increased to a value
greater than the triac latching current.
A resistor from AC to VCC may be
required to ensure the gate drive
pulse is still present when the
negative mains voltage is insufficient
for the load current to have reached
the negative latching current.
In the simplest application (optimised
for a 400W load), the AC input is
connected via a160 kresistor to the
220/250 volt AC mains supply line.
The AC input signal is rectified to
provide some of the internal supply
voltage, and also provides the
synchronising information required by
the IES5521A to generate the zero
crossing signal.
6.4 PWR Power supply
The pin (PWR) allows a further
resistor to be used to provide an
adequate DC power supply while also
permitting easy adjustment of the
gate pulse width via the AC pin.
The PWR pin is driven by a resistor
from the mains Active. This resistor is
chosen to ensure that the DC power
supply is sufficient to provide the
power supply necessary for the
function of the IES5521A, and in
addition to provide the energy needed
for the gate drive. These calculations
are described in the OM1654
application note AN002, and an
application example is given in
section 9.
2005 Dec 12
2 Product Specification

विन्यास 10 पेज
डाउनलोड[ IES5521A Datasheet.PDF ]


शेयर लिंक


अनुशंसा डेटापत्रक

भाग संख्याविवरणविनिर्माण
IES5521ASimple Zero Crossing Triac Control CircuitIES
IES


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