IRPLHALO1E International Rectifier, IRPLHALO1E Datasheet - Page 11

• Manufacturer Part Number: IRPLHALO1E
• Description: KIT HALOGIN CONVERTER 100VA
• Manufacturer: International Rectifier

Specifications of IRPLHALO1E

• Main Purpose: Lighting, Ballast Control
• Utilized Ic / Part: IR2161
• Lead Free Status / RoHS Status: Lead free / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Other names: *IRPLHALO1E

www.irf.com
The power dissipation in Rcs should also be considered and is given by
In this case :
It is important to bear in mind that the resistor must be rated to handle this current in a high ambient
temperature as well as the high currents that occur for a short period under short circuit conditions.
IMPORTANT NOTE
The filter resistor RF should be 1K, which is needed to protect the CS input from negative going
transients. CF should be 1nF and is also necessary to filter out switching transients that can impair
the operation of the shutdown circuit.
Output Transformer Selection
The size of the core and design of the output transformer need to be seleted bearing in mind the
throughput power at maximum load. The core may be a toroid, a pair of E-cores, or any other
shape. The turns ratio can be easily determined by the ratio of half the AC line RMS input voltage
and the required output, which is usually (but not always) 12V. When the correct number of turns for
the primary has been determined, it is simple to calculate the number of secondary turns.
The number of turns required for the primary should be calculated so that at the minimum frequency
the transformer will not saturate at the peak voltage, i.e. half the peak DC bus voltage.
It is important to bear in mind that the peak voltage at the DC bus occurs during dimming with a
leading edge, triac type, dimmer where the firing angle is at the peak of the line. This is because a
transient is produced when the triac is fired and so an additional voltage is added to the DC bus
voltage. As a rule the MOSFET breakdown voltage may be used to calculate the primary turns such
that the core will not saturate at minimum frequency and maximum temperature.
If the core saturates a large current will flow in the half bridge and may trigger the short circuit
protection when the convertor is connected via a dimmer.
P
CS
100
230
2
P
V
LOAD
AC
. 0
33
2
. 0
062
R
CS
W
IRPLHALO1E
11