L6599D STMicroelectronics, L6599D Datasheet - Page 26

• Manufacturer Part Number: L6599D
• Description: IC RESONANT CONVRTR CTRLR 16SOIC
• Manufacturer: STMicroelectronics
• Type: Phase Shift Resonant Controllersr

Specifications of L6599D

• 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 Current: 800 mA (Max)
• 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
• Supply Voltage Range: 8.85V To 16V
• Digital Ic Case Style: SOIC
• No. Of Pins: 16
• Operating Temperature Range: -40°C To +150°C
• Svhc: No SVHC (15-Dec-2010)
• Base Number: 6599
• Device Type: Power
• Rohs Compliant: Yes
• 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

Application information
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Figure 32. Soft-start and delayed shutdown upon overcurrent timing diagram
This function is realized with pin 2 (DELAY), by means of a capacitor C
resistor R
OCP comparator, in addition to discharging C
sources 150 µA from the DELAY pin and charges C
the OCP comparator and the internal current source will be repeatedly activated and C
will be charged with an average current that depends essentially on the time constant of the
current sense filtering circuit, on C
discharge due to R
typically much longer.
This operation will go on until the voltage on C
There is not a simple relationship that links T
determine C
order of 100 ms.
Once C
continuously regardless of the OCP comparator's output, and the 150 µA current source is
continuously on, until the voltage on C
with T
close to f
As the voltage on C
pulled low. Also the internal generator is turned off, so that C
discharged by R
which will take:
PFC_STOP
Primary
Current
DELAY
ISEN
Vout
Vcc
Css
MP
START-UP
Delay
start
is expressed in ms and C
0.8V
3.5V
0.3V
Delay
2V
0A
2V
Delay
is charged at 2 V the internal switch that discharges C
(see
SOFT-START
connected to ground. As the voltage on the ISEN pin exceeds 0.8 V the first
Delay
T
experimentally. As a rough indication, with C
ss
Chapter 7.3:
Delay
Delay
. The IC will restart when the voltage on C
OPERATION
T
NORMAL
can be neglected, considering that the associated time constant is
STOP
is 3.5 V, the device stops switching and the PFC_STOP pin is
=
Soft-start) to minimize the energy inside the resonant circuit.
LOAD
OVER
R
Delay
Delay
SS
and the characteristics of the resonant circuit; the
OPERATION
T
Delay
NORMAL
MP
⋅
in µF. During this time the L6599 runs at a frequency
C
=
Delay
reaches 3.5 V. This phase lasts:
10 C
SH
SS
Delay
⋅
OVERLOAD
ln
, turns on an internal current generator that
to C
T
Delay
3.5
------- -
0.3
SH
reaches 2 V, which defines the time T
Delay
Delay
≈
2.5R
. During an overload/short-circuit
, thus it is more practical to
T
MIN. POWER
MP
Delay
Delay
Delay
Delay
⋅
SHUTDOWN
C
will now be slowly
Delay
T
SS
= 1 µF T
STOP
will be less than 0.3V,
is forced low
Delay
SH
and a parallel
will be in the
SOFT-START
L6599
Delay
SH
t
t
t
t
t
t
t
.