EVAL6569 STMicroelectronics, EVAL6569 Datasheet - Page 2

• Manufacturer Part Number: EVAL6569
• Description: BOARD EVAL LIGHTING L6569
• Manufacturer: STMicroelectronics
• Type: Charge Pumpsr

Specifications of EVAL6569

• Mfg Application Notes: L6569, AN880 App Note
• Main Purpose: Lighting, Ballast Control
• Embedded: No
• Utilized Ic / Part: L6569
• Primary Attributes: 18 W, Optimized for a CF18DT/E/830, 120 or 230 VAC
• Secondary Attributes: Preheating Done with a PTC
• Input Voltage: 230 V
• Product: Power Management Modules
• Supply Current: 0.17 A
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6569
• Other names: 497-4738

AN880 APPLICATION NOTE
THE L6569 AND ITS APPLICATIONS
The L6569
The L6569 is able to directly control a symmetric
half bridge inverter of a fluorescent lamp ballast,
or a low voltage halogen lamp transformer.Two
270mA buffers drive the inverter MOSFETs in
complementary fashion with a 1.25 s built-in
dead time to prevent cross conduction. The buffer
for the upper Mosfet is driven through a 600V
level shifter realized in BCD off line technology.
The oscillator, similar to a CMOS 555 timer, oper-
ates from 25 to 150 kHz with a +/-5% maximum
tolerance. The internal 15V shunt regulator has a
9V Under Voltage Lock Out with an 1V hysteresis,
Figure 3: Block diagram of the L6569.
Figure 4: Basic application diagram using the L6569 and two STD4NK50Z MOSFETs.
2/14
AC LINE
RF
CF
UVLO
180K
10 F
10 F
1nF
10K
GND
VS
LOGIC CONTROL
with DEAD TIME
CHARGE
L6569
PUMP
and the circuit requires only 150 A at power up.
The L6569 integrates a high voltage Lateral
DMOS transistor in place of the usual external di-
ode [2] to charge the bootstrap capacitor for the
upper buffer. Figure 5 shows DMOS operating as
a synchronous rectifier.
The applications
The primary application for the L6569 is the Com-
pact Fluorescent Lamp. With the oscillator, the
supply and the Mosfet drivers it is the core of the
application, and designers can customize the cir-
cuit to their requirements.
SHIFTER
LEVEL
100nF
22
22
BOOT
STD4NK50Z
DRIVER
DRIVER
HIGH
SIDE
LOW
SIDE
D02IN1385
HVG
OUT
LVG
LAMP