EVAL6569 STMicroelectronics, EVAL6569 Datasheet - Page 8

• 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
as a transformer supplying the voltage to the fila-
ments. Only few components are added around
the L6569 (see figure 18), and the control of the
preheat energy is less sensitive to the preheat du-
ration and the inverter frequency (see figure 17b).
Figure 17: Basic preheat voltage control diagram (a); preheat filament energy curve (b)
Figure 18: Double frequency control for the L6569 with programmed frequency and duration.
8/14
(A)
(B)
R
C
R
C
F
F
E
Vf
E=V²/R
The start up initialization
The initial conditions of the power switching start
up requires care; especially if the resonant and
switching frequencies are close to each other.
The resonant network is not loaded and the full
C
F_ST
1_Vs
2_RF
3_CF
V
CTL
L6569
LAMP
t
V
CTL