IRPLDIM2U International Rectifier, IRPLDIM2U Datasheet - Page 9

• Manufacturer Part Number: IRPLDIM2U
• Description: BALLAST DIM DIG 32W/T8 120VAC
• Manufacturer: International Rectifier

Specifications of IRPLDIM2U

• Main Purpose: Lighting, Ballast Control
• Utilized Ic / Part: IR21592
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -
• Lead Free Status / Rohs Status: Not Compliant
• Other names: *IRPLDIM2U

Shutdown and Low Power
With shutdown there are some unique power conditions. With the shutdown line low and the lamp ignited, the
PIC16F628 derives its power from the charge pump of the IR21592. The charge pump provides enough current
for the microcontroller to run at its internal frequency of
4MHz during normal operation. When the shutdown
line is asserted the IR21592 is disabled, and the charge
pump is no longer functioning. Current is drawn directly
from the high voltage DC line through a high value re-
sistor. The micro controller is put to sleep during this
time to minimize current draw and power dissipation.
To receive data, which requires significant current, the
PIC16F628 wakes up and starts the charge pump of
the IR21592 long enough to process the command, typi-
cally less than 25ms, but not long enough to ignite the
lamp (see waveforms in Figure 9). Doing this unique
management minimizes power dissipation during shut-
down.
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Fig. 8 Dali and Micro-Conttoller signals
Receive signal
Receive-drive signal
RB1
Communications-enable
RB0
Fig. 9 Communications signal with the lamp off
Receive signal
Receive-drive signal
RB1
Communications-enable
RB0
SD pin IR21592
LO pin IR21592
IRPLDIM2U
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