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L6574 датащи(PDF) 5 Page - STMicroelectronics

номер детали L6574
подробное описание детали  CFL/TL BALLAST DRIVER PREHEAT AND DIMMING
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

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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
kpre
1
Pre Heat Timing constant
Cpre = 330nF
1.15
1.5
1.85
s/
µF
kfs
Frequency Shift Timing Constant
Cpre = 330nF
0.115
0.15
0.185
s/
µF
Vthpre
Pre Heat Timing Comparator
Threshold
3.3
3.5
3.7
V
Sense OP AMP
lib
6,7
Input Bias current
0.1
µA
Vio
Input Offset Voltage
-10
10
mV
Rout
5
Ouput Resistance
200
300
Iout +
Sink Output Current
Vout = 0.2V
0.5
mA
Iout -
Source Output Current
Vout = 4.5V
0.5
mA
Vic
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
Vthe
8,9
Enabling Comparators Threshold
0.56
0.6
0.64
V
Vhye
Enabling Comparators Hysteresis
20
100
mV
tpulse
Minimum Pulse lenght
200
ns
ELECTRICAL CHARACTERISTCS (continued)
(VS = 12V; VBOOT-VOUT = 12V; Tamb = 25°C)
Symbol
Pin
Parameter
Test Condition
Min.
Typ.
Max.
Unit


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