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E-L6574D

P1-P3P4-P6P7-P9P10-P10
L6574
4/10
RECOMMENDED OPERATING CONDITIONS
(*) If the condition Vboot - Vout < 18 is guaranteed, Vout can range from -3 to 580V.
Symbol Parameter Value Unit
V
S
Supply Voltage 10 to V
CL
V
V
OUT
(*) High Side Reference -1 to V
BOOT
-V
CL
V
V
BOOT
(*) Floating Supply Voltage 500 V
ELECTRICAL CHARACTERISTCS
(V
S
= 12V; V
BOOT
-V
OUT
= 12V; T
amb
= 25°C)
Symbol Pin Parameter Test Condition Min. Typ. Max. Unit
Supply Voltage
V
suvp
12 V
s
Turn On Threshold 9.5 10.2 10.9 V
V
suvn
V
s
Turn Off Threshold 7.3 8 8.7 V
V
suvh
Supply Voltage Under Voltage
Hysteresys
2.2 V
V
cl
Supply Voltage Clamping 14.6 15.6 16.6 V
I
su
Start Up Current V
S
< V
suvn
250 µA
I
q
Quiescent Current, fout = 60kHz,
no load.
V
S
> V
supv
2mA
High voltage Section
I
bootleak
16 BOOT pin leakage current V
BOOT
= 580V 5 µA
I
outleak
14 OUT pin Leakage Current V
OUT
= 562V 5 µA
High/Low Side Drivers
I
hvgso
15 High Side Driver Source Current V
HVG
-V
OUT
= 0 170 250 mA
I
hvgsi
15 High Side Driver Sink Current V
HVG
-V
BOOT
= 0 300 450 mA
I
hvgso
11 Low Side Drive Source Current VLVG-GND = 0 170 250 mA
I
lvgsi
11 Low Side Drive Source Current V
LVG
-V
S
= 0 300 450 mA
t
rise
15,
11
Low/High Side Output Rise Time
C
load
= 1nF
80 120 ns
t
fall
Low/High Side Output Fall Time
C
load
= 1nF
50 80 ns
Oscillator
DC
14 Output Duty Cycle 48 50 52 %
f
ing
14 Minimum Output Oscillation
Frequency
C
F
= 470pF;
R
ing
= 50kΩ
58.2 60 61.8 kHz
f
pre
14 Maximum Output Oscillation
Frequency
C
F
= 470pF;
R
ing
= 50kΩ;
R
pre
= 47kΩ
114 120 126 kHz
V
ref
2,4 Voltage to current converters
threshold
1.9 2 2.1 V
I
Vref
2,4 Reference Current 0 120 µA
t
d
14 Dead Time between Low and
High Side Conduction
0.8 1.25 1.7 µs
5/10
L6574
High/Low Side Driving Section:
High and low side driving sections provide the proper drive to the external power MOSFET. A high sink/
source driving current (450/250 mA typical) ensures fast switching times when a size 4 external power
MOSFET needs to be driven.
Bootstrap Section:
A patented integrated bootstrap section replaces an external bootstrap diode. This section together with
a bootstrap capacitor provides the bootstrap voltage to drive the high side power MOSFET. This function
is achieved using a high voltage DMOS driver which is driven synchronously with the low side external
power MOSFET.
For a safe operation, current flow into the Vboot pin is inhibited, even though ZVS operation may not be
ensured.
Timing Section:
To set the proper preheat time (tpre=kpre*Cpre) for the bulb, a capacitor is connected to the Cpre pin
which is charged with a fixed current. During tpre, the output is switching at fpre (see Oscillator Section).
When the tpre expires, the Cpre capacitor is discharged and then recharged with a different current. This
sets a second time interval tsh (0.1 times the selected preheat time tpre) during which frequency shifting
from fpre to fing is performed to ensure lamp ignition.
Timing Section
k
pre
1 Pre Heat Timing constant C
pre
= 330nF 1.15 1.5 1.85 s/µF
k
fs
Frequency Shift Timing Constant C
pre
= 330nF 0.115 0.15 0.185 s/µF
V
thpre
Pre Heat Timing Comparator
Threshold
3.3 3.5 3.7 V
Sense OP AMP
l
ib
6,7 Input Bias current 0.1 µA
V
io
Input Offset Voltage -10 10 mV
R
out
5 Ouput Resistance 200 300 Ω
I
out +
Sink Output Current V
out
= 0.2V 0.5 mA
I
out -
Source Output Current V
out
= 4.5V 0.5 mA
V
ic
6,7 Common Mode Input Range -0.2 3 V
GBW Sense Op Amp Gain Band Width
Product
1MHz
Gdc DC Open Loop Gain 80 dB
Comparators
V
the
8,9 Enabling Comparators Threshold 0.56 0.6 0.64 V
V
hy
e Enabling Comparators Hysteresis 20 100 mV
t
pulse
Minimum Pulse lenght 200 ns
ELECTRICAL CHARACTERISTCS (continued)
(V
S
= 12V; V
BOOT
-V
OUT
= 12V; T
amb
= 25°C)
Symbol Pin Parameter Test Condition Min. Typ. Max. Unit
L6574
6/10
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
V
CC
LVG
HVG
EN1
V
SUVP
D97IN490
V
CC
t
PRE
t
PRE
t
SH
t
SH
f
PRE
f
ING
EN2
f
OUT
V
SUVP
D97IN491B
P1-P3P4-P6P7-P9P10-P10

E-L6574D

Mfr. #:
Buy E-L6574D
Manufacturer:
STMicroelectronics
Description:
Gate Drivers CFL/TL Ballast
Lifecycle:
New from this manufacturer.
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