EVAL6599-400W-T STMicroelectronics, EVAL6599-400W-T Datasheet - Page 16

• Manufacturer Part Number: EVAL6599-400W-T
• Description: DEMO BOARD FOR L6599
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVAL6599-400W-T

• Main Purpose: AC/DC, Primary Side and PFC
• Outputs And Type: 4, Isolated
• Power - Output: 400W
• Voltage - Output: 200V, 75V, 5V, 3.3V
• Current - Output: 1.5A, 1A, 1A, 700mA
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Resonant
• Frequency - Switching: 120kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6563, L6599
• Input Voltage: 90 V to 264 V
• Output Voltage: 3.3 V to 200 V
• Dimensions: 132 mm x 265 mm
• Product: Power Management Modules
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: L6599
• Other names: 497-5857

Application information
7.1
16/36
Oscillator
The oscillator is programmed externally by means of a capacitor (CF), connected from pin 3
(CF) to ground, that will be alternately charged and discharged by the current defined with
the network connected to pin 4 (RF
about 2 mA source capability and the higher the current sourced by the pin is, the higher the
oscillator frequency will be. The block diagram of
circuit that explains the operation.
The network that loads the RFmin pin generally comprises three branches:
1.
2.
3.
Figure 22. Oscillator's internal block diagram
The following approximate relationships hold for the minimum and the maximum oscillator
frequency respectively:
R
Fmin
A resistor RF
operating frequency;
A resistor RF
phototransistor that transfers the feedback signal from the secondary side back to the
primary side; while in operation, the phototransistor will modulate the current through
this branch - hence modulating the oscillator frequency - to perform output voltage
regulation; the value of RF
be operated at when the phototransistor is fully saturated;
An R-C series circuit (C
to set up a frequency shift at start-up (see
contribution of this branch is zero during steady-state operation.
C
R
SS
SS
max
min
R
Fmax
connected between the pin and ground that determines the minimum
connected between the pin and the collector of the (emitter-grounded)
RFmin
SS
4
2 V
max
f
+ R
L6599
max
SS
min
determines the maximum frequency the half-bridge will
+
-
=
0.9V
f
1 V
min
) connected between the pin and ground that enables
-----------------------------------------------------------------
3 CF
). The pin provides an accurate 2 V reference with
⋅
3.9V
4 V
=
------------------------------------ -
3 CF RF
⋅
⋅
+
+
-
-
(
RF
Chapter 7.3:
I
1
⋅
1
min
R
Figure 22
S
R
||
min
RF
Q
max
)
shows a simplified internal
Soft-start). Note that the
K
M
2·K
·I
R
M
·I
R
K
M
·I
R
3
CF
L6599
CF