L6599DTR STMicroelectronics, L6599DTR Datasheet - Page 16

• Manufacturer Part Number: L6599DTR
• Description: IC RESONANT CONVRTR CTRLR 16SOIC
• Manufacturer: STMicroelectronics
• Type: Phase Shift Resonant Controllerr

Specifications of L6599DTR

• Applications: Resonant Converter Controller
• Voltage - Supply: 8.85 V ~ 16 V
• Current - Supply: 3.5mA
• Operating Temperature: 0°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 16-SOIC (3.9mm Width)
• Number Of Outputs: Single Output
• Output Current: 800 mA
• Switching Frequency: 500 KHz
• Operating Supply Voltage: 8.85 V to 16 V
• Maximum Operating Temperature: + 150 C
• Minimum Operating Temperature: - 40 C
• Mounting Style: SMD/SMT
• For Use With: 497-10542 - BOARD EVAL BASED ON L6599497-8429 - BOARD ADAPTER L6599/STP12NM50N497-8265 - BOARD EVAL BASED ON L6599497-5857 - DEMO BOARD FOR L6599497-5856 - DEMO BOARD FOR L6599497-5497 - EVAL BOARD FOR L6599497-5496 - EVAL BOARD FOR L6599
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Input: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-6156-2

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