L6585D STMicroelectronics, L6585D Datasheet - Page 13

• Manufacturer Part Number: L6585D
• Description: IC CTRLR PFC/BALLAST SOIC-20
• Manufacturer: STMicroelectronics
• Type: PFC/Ballast Controllerr

Specifications of L6585D

• Frequency: 58.4 ~ 62 kHz
• Current - Supply: 7mA
• Current - Output: 600mA
• Voltage - Supply: 11 V ~ 16 V
• Operating Temperature: -40°C ~ 150°C
• Package / Case: 20-SOIC (7.5mm Width)
• For Use With: 497-8421 - BOARD DEMO 1X54W T5 LAMP497-8405 - BOARD EVAL L6585D/TSM101
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6585D
5.1.2
Ignition (time interval B
When the voltage at pin T
impedance state and C
by C
The ignition time is the time necessary to EOI voltage to reach 1.9V, so, by means of simple
calculation:
Equation 3
During this phase, the half-bridge current control can limit the maximum voltage applied
to the lamp by forcing small frequency increases whenever the half-bridge sense resistor
voltage exceeds the HBCSH threshold (see the “Half-Bridge current control” paragraph).
Figure
ignite for a time longer than the pre-heating one (counted by a cycle charge/discharge of the
T
UVLO.
CH
IGN
pin), the IC is stopped, enters low consumption and waits for either a re-lamp or an
5, centre and right, shows the L6585D behavior as the lamp gets older; if it doesn’t
*R
PRE
that defines the ignition time and the frequency shift starts.
IGN
CH
is exponentially charged according to the time constant
drops down to 1.50V (typ.), the pin EOI is driven in high
Figure
T
IGN
5)
=
3 C
⋅
IGN
⋅
R
PRE
Application information
τ
given
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