E-L6574D STMicroelectronics, E-L6574D Datasheet - Page 6

• Manufacturer Part Number: E-L6574D
• Description: BALLAST, DIMMABLE LAMP, SMD, 6574
• Manufacturer: STMicroelectronics
• Type: High Side/Low Sider

Specifications of E-L6574D

• Module Configuration: Half Bridge
• Supply Current: 25mA
• Supply Voltage Range: 10V To 16.6V
• Driver Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +125°C
• Svhc: No SVHC
• Rise Time: 120 ns
• Fall Time: 80 ns
• Supply Voltage (min): 10 V
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SO-16
• Bridge Type: Half Bridge
• Minimum Operating Temperature: - 40 C
• Number Of Drivers: 2
• Number Of Outputs: 2
• Device Type: Ballast Control
• Base Number: 6574
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

L6574
Oscillator Section:
A voltage controlled oscillator, with the selected frequencies fpre and fing, drives the output half bridge.
Independently selected, fpre is effective during tpre and fing is effective during normal lamp burning. When
working open loop, fpre and fing are the highest and lowest allowed oscillation frequencies.
Closed loop control of the lamp current under normal operation can be achieved with the L6574. This is
accomplished by automatic adjustment of the oscillator frequency. The OP AMP output is fed through a
resistor diode network to the Ring pin. See AN 993.
OP AMP Section:
The integrated OP AMP offers low output impedance, wide bandwidth, high input impedance and wide
common mode range. It can be readily used to implement closed loop control (see Oscillator Section) of
the lamp current.
EN1, EN2 Comparators:
Two CMOS comparators, with thresholds set at 0.6 V (typical) are available to implement protection meth-
ods (such as overvoltage, lamp removal, etc.). Short pulses (>200nsec) at the comparator inputs are rec-
ognized.
The EN1 input (active high) forces the L6574 in the shut down state (e.g. LVG low, HVG low, oscillator
stopped) in the event of an undervoltage condition. Normal operating condition is resumed after a power-
off power-on sequence or when EN2 input is high.
The EN2 input (active high) also restarts a preheat sequence (see timing diagrams).
TIMING DIAGRAMS
6/10
EN1
HVG
V
LVG
CC
f
EN2
V
OUT
CC
D97IN491B
f
PRE
t
V
PRE
SUVP
V
SUVP
t
SH
f
ING
t
PRE
t
SH
D97IN490