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PDF IRPLLNR1 Data sheet ( Hoja de datos )
| Número de pieza | IRPLLNR1 | |
| Descripción | POWIRLIGHT REFERENCE DESIGN : LINEAR BALLAST | |
| Fabricantes | IXYS Corporation | |
| Logotipo |  |
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Reference Design Data Sheet (August, 1997)
IRPLLNR1
POWIRLIGHTTM REFERENCE DESIGN : LINEAR BALLAST
Features
• Drive 2X40WT12
• Universal Input (90-255Vac)
• High Power Factor (0.99) & Low THD
• High-Frequency Operation (40kHz)
• Lamp Filament Preheating
• Lamp Fault Protection with Auto-Restart
• Over Temperature Protection
• IR2153 HVIC Ballast Controller
Description
The IRPLLNR1 is a high efficiency, high
power factor, non-dimmable electronic ballast
designed for linear fluorescent lamp types.
The design contains an active power factor
correction circuit for universal voltage input
and a ballast control circuit using the IR2153
for controlling the lamp. Other features
include EMI filtering, transient protection and
lamp fault protection. The IRPLLNR1 is
intended as a reference design to be used as
development tool to speed up customers’
time to market.
Block Diagram
EMI Filter
Rectifier
PFC
Half-Bridge Output Stage Lamps
Line
PFC Control
IR2153
Fault Logic
Reference Design Data Sheet intended for design information only.
Subjected to changes without prior notice.
1
1 page  
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IRPLLNR1
Fault Protection
The shutdown circuitry consists of 2 quad comparator ICs (IC2 and IC4), a current detection
filter (R21, R22, C16 and D12), a pull-up lamp removal circuit (R23, R24, R25, R26, D16 and
C22), and over-current sensing resistors (R47, R48, R49, R43, R44, R46, D10 and D19). A
more detailed diagram of the logic circuitry is given in the Ballast Control Logic and Timing
sections of this paper. The current detection filter rectifies and integrates a measurement of
the lamp resonant current from the source of the lower MOSFET of the half-bridge and
compares it against a fixed threshold voltage. Should the current exceed the threshold in the
event of over-current due to a non-strike condition of the lamp or non-zero voltage switching of
the half-bridge due to an open circuit or broken lamp cathodes, the CT pin of the IR2153 is
latched below the internal shutdown threshold (1/6 Vcc) and the ballast is shutdown.
In the event of a lamp exchange, the latch is reset with the pull-up network at the lamp,
and the CT pin of the IR2153 is held below the internal shutdown threshold in an unlatched
state (see Timing Diagram). When a new lamp is re-inserted, the ballast performs an auto
restart without a recycling of the input line voltage. During a lamp removal, the frequency is
also reset to the preheat frequency to avoid damage to the half-bridge switches due to below-
resonance operation which can occur upon re-insertion of the lamp. For a dual lamp ballast, a
second pull-up network is added to the second lamp (R27, R28, R29, R30) and is ‘OR-ed’
together with the first lamp. If either lamp is removed during running, the ballast is shutdown.
In the event of a broken upper cathode by either lamp during normal operation, non zero-
voltage switching occurs at the half-bridge and will be detected by the current detection filter at
source of the lower MOSFET of the half-bridge. Both half-bridge MOSFETs are latched off.
Should the DC bus decrease below a fixed threshold voltage during an undervoltage
condition of the line voltage, the frequency is shifted back up to the preheat frequency to fulfill
zero-voltage switching of the half-bridge, and the latch is disabled. This prevents latch-up
during a fast cycling of the line voltage or a brown out.
IRPLLNR1
Reference Design Data Sheet intended for design information only.
Subjected to changes without prior notice.
5
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Figure 9: Filament current (upper trace, 0.5A/div) and
voltage (lower trace, 10V/div) during preheat.
Timescale = 0.5A/div.
Figure 10: VCO voltage (5V/div) showing control sequence
during preheat, ignition and running conditions.
Timescale = 0.5A/div.
Figure 11: Half-bridge voltage (upper trace, 200V/div),
half-bridge current (middle/upper trace, 1A/div), Vth2
threshold voltage (middle/lower trace, 1V/div) and current
detection voltage (lower trace, 1V/div) During normal
running condtions. Timescale = 5us/div.
Figure 12: Half-bridge voltage (upper trace, 200V/div)
and lampout signal V:D16 (lower trace, 5V/div) during
lamp removal/re-insertion condition. Timescale = 10ms/div.
IRPLLNR1
Measurements (cont.)
Reference Design Data Sheet intended for design information only.
Subjected to changes without prior notice.
11
11 Page | ||
| Páginas | Total 15 Páginas | |
| PDF Descargar | [ Datasheet IRPLLNR1.PDF ] | |
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