IRPLDIM1E Datasheet IRPLDIM1E, IRPLDIM1U | P13-P15

13www.irf.com

Waveforms

Figure 4 shows the voltage appearing across the lamp while Figure 5 shows the current flowing

through the lamp during Startup, Preheat, Ignition and Dim modes.

Figure 4, Lamp voltage during Startup, Preheat,

Ignition and Dim (100%)

Figure 5, Lamp current during Startup, Preheat,

Ignition and Dim (100%) (100mA/div.)

Normal Powerdown

A Normal Powerdown occurs when the AC line voltage is disconnected from the ballast. When this

occurs the voltage on the VDC pin of IC2 drops below the line fault threshold (3V) and IC2 shuts

down in a controlled fashion. The oscillator is stopped, the half-bridge driver outputs (LO and HO)

are turned off and capacitor CPH is discharged. IC2 also goes into its UVLO/micro-power mode and

the bus voltage begins to collapse.

Fault Mode

Fault mode is when the ballast driver is shutdown due to the detection of a lamp fault. Note that when

the ballast is in this Fault mode the power factor correction section of the ballast is also shutdown

and the bus voltage will drop to the non-boosted/unregulated level. There are several lamp fault

conditions which can put the ballast into the Fault mode. The lamp fault conditions detected include:

near/below resonance (under-current) detection, hard-switching detection and over-current detec-

tion. Resistor RCS in the source lead of the low side MOSFET (MLS) serves as the current sensing

point for the half-bridge which is used to detect these lamp fault conditions. In operation when the

half-bridge is oscillating, a voltage appears across RCS whenever the low side MOSFET, MLS, is

turned on or the high side MOSFET, MHS, is turned off. The magnitude of this voltage directly relates

to the current in the lamp resonant circuit. Figure 6 shows the voltage which appears across resistor

RCS during normal Run mode conditions while Figure 14 shows the voltage appearing across the

lamp during the end of Preheat mode, Ignition Ramp mode and the beginning of Run mode. Also

shown in Figure 7 are the gate drive signals for the low side MOSFET (LO pin) and the high side

MOSFET (HO-VS pin).

14 www.irf.com

Figure 6, Normal Run mode, Upper trace: voltage

across RCS, Middle trace: IC2 LO pin voltage,

Lower trace: IC2 HO-VS pin voltage

Figure 7, Normal lamp ignition: Lamp voltage during the

end of Preheat mode, Ignition Ramp mode and the

beginning of the Run mode

During the Preheat mode the over-current protection is disabled. However, at the end of Preheat

mode (the beginning of the Ignition mode) the hard-switching and over-current detection are en-

abled. If at any time thereafter the voltage magnitude across resistor RCS rises above the over-

current threshold (1.6V) of the CS pin of IC2, a lamp fault condition is signaled and the half-bridge

output MOSFETs’, (MHS and MLS) are turned off and the ballast goes into Fault mode. This can

happen if the lamp fails to ignite or if the upper filament is open. For failure to ignite the lamp, the

current in the half-bridge increases and thus the voltage across resistor RCS increases above the

over-current threshold signaling a fault. Figure 8 shows the voltage across resistor RCS and the

voltage appearing across the lamp when the ballast detects a failure to ignite the lamp and goes into

Fault mode. Figure 9 shows the voltage appearing across the lamp during the tail end of the Preheat

mode and the Ignition mode for a failure of the lamp to ignite condition. If the upper filament is open,

the half-bridge output hard-switches and each time the low side MOSFET (MLS) is turned on a large

current pulse occurs and thus a large voltage pulse occurs across resistor RCS signaling a fault,

Figure 10 shows this hard-switching condition. Figure 11 shows the lamp voltage during the Preheat

mode and beginning of Ignition Ramp mode for this hard-switching condition when the lamp fault

condition is detected. The ballast will remain in Fault mode until either the line voltage is cycled or a

lamp replacement is performed.

15www.irf.com

Figure 8, Failure of lamp to ignite condition (lamp

filaments good): Upper trace: voltage across

RCS, Lower trace: lamp voltage

Figure 9, Failure of lamp to ignite condition (lamp

filaments good): Lamp voltage during the end

of Preheat and Ignition Ramp modes

Figure 10, Hard-switching condition (upper trace

filament open): Upper trace: voltage across RCS,

Middle trace: IC2 LO pin voltage,

Lower trace: IC2 HO-VS pin voltage

Figure 11, Hard-switching condition (upper filament open):

Lamp voltage during Preheat mode and beginning of

Ignition Ramp mode when lamp fault is detected

IR WORLD HEADQUARTERS: 233 Kansas St., El Segundo, California 90245 Tel: (310) 252-7105

Data and specifications subject to change without notice. 6/30/2005

P1-P3 P4-P6 P7-P9 P10-P12 P13-P15

IRPLDIM1E

Mfr. #:

Buy IRPLDIM1E

Manufacturer:

Infineon Technologies

Description:

KIT BALLAST DIMMING 230VAC

Lifecycle:

New from this manufacturer.

Delivery:

DHL FedEx Ups TNT EMS

Payment:

T/T Paypal Visa MoneyGram Western Union

IRPLDIM1E

IRPLDIM1E

Products related to this Datasheet