STEVAL-ILD002V1 STMicroelectronics, STEVAL-ILD002V1 Datasheet - Page 5

• Manufacturer Part Number: STEVAL-ILD002V1
• Description: BOARD EVAL BASED ON L6574
• Manufacturer: STMicroelectronics

Specifications of STEVAL-ILD002V1

• Main Purpose: Lighting, Ballast Control
• Embedded: No
• Utilized Ic / Part: L6574
• Primary Attributes: 20 W (3U T3 Lamp), 180 ~ 264 VAC, Dimmable
• Secondary Attributes: Preheating Ignition
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: STEVAL-ILD002V1

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.
ELECTRICAL CHARACTERISTCS (continued)
(V
Timing Section
Sense OP AMP
Comparators
Symbol
S
V
GBW
t
I
V
R
I
Gdc
V
k
pulse
out +
V
out -
V
k
thpre
= 12V; V
l
hy
pre
ib
out
the
fs
io
ic
e
Pin
6,7
6,7
8,9
1
5
BOOT
Pre Heat Timing constant
Frequency Shift Timing Constant
Pre Heat Timing Comparator
Threshold
Input Bias current
Input Offset Voltage
Ouput Resistance
Sink Output Current
Source Output Current
Common Mode Input Range
Sense Op Amp Gain Band Width
Product
DC Open Loop Gain
Enabling Comparators Threshold
Enabling Comparators Hysteresis
Minimum Pulse lenght
-V
OUT
= 12V; T
Parameter
amb
= 25°C)
C
C
V
V
out
out
pre
pre
= 0.2V
= 4.5V
= 330nF
= 330nF
Test Condition
0.115
Min.
1.15
0.56
-0.2
200
3.3
-10
0.5
0.5
20
Typ.
0.15
200
1.5
3.5
0.6
80
1
0.185
Max.
1.85
0.64
300
100
3.7
0.1
10
3
L6574
MHz
Unit
s/ F
s/ F
mV
mA
mA
mV
dB
ns
V
V
V
A
5/10