EVAL6599-200W STMicroelectronics, EVAL6599-200W Datasheet - Page 15

• Manufacturer Part Number: EVAL6599-200W
• Description: EVAL BOARD FOR L6599
• Manufacturer: STMicroelectronics
• Type: Power Factor Correctionr

Specifications of EVAL6599-200W

• Main Purpose: AC/DC, Primary Side and PFC
• Outputs And Type: 4, Isolated
• Power - Output: 200W
• Voltage - Output: 24V, 12V, 5V, 3.3V
• Current - Output: 6A, 5A, 1A, 700mA
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: Resonant
• Frequency - Switching: 95kHz
• Board Type: Fully Populated
• Utilized Ic / Part: L6563, L6599
• Input Voltage: 90 V to 264 V
• Output Voltage: 3.3 V to 24 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: 497-5496

AN2393
2.4
Table 3.
Table 4.
Short-circuit protection
The L6599 is equipped with a current sensing input (pin #6, ISEN) and a dedicated over-
current management system. The current flowing in the circuit is detected (through the not
dissipative sensing circuit already mentioned in
pin. It is internally connected to the input of a first comparator, referenced to 0.8 V, and to
that of a second comparator referenced to 1.5 V. If the voltage externally applied to the pin
exceeds 0.8 V, the first comparator is tripped causing an internal switch to be turned on
discharging the soft-start capacitor CSS.
For output short-circuits, this operation results in a nearly constant peak primary current.
Using the L6599, the designer can externally program the maximum time (t
converter is allowed to run overloaded or under short-circuit conditions. Overloads or short-
circuits lasting less than t
immunity to short duration phenomena. If, instead, t
(OLP) procedure is activated that shuts down the L6599 and, in case of continuous
overload/short circuit, results in continuous intermittent operation with a user-defined duty
cycle. This function is realized with the pin DELAY (#2), by means of a capacitor C24 and
the parallel resistor R37 connected to ground. As the voltage on the ISEN pin exceeds 0.8 V,
the first OCP comparator, in addition to discharging CSS, turns on an internal current
generator that via the DELAY pin charges C24. As the voltage on C24 reaches 3.5 V, the
L6599 stops switching and the PFC_STOP pin is pulled low. Also the internal generator is
turned off, so that C24 will now be slowly discharged by R37. The IC will restart when the
voltage on C24 becomes less than 0.3 V. Additionally, if the voltage on the ISEN pin reaches
1.5 V for any reason (e.g. transformer saturation), the second comparator will be triggered,
the L6599 will shutdown and the operation will be resumed after an on-off cycle.
Figure 14
above. The on-off operation is controlled by the voltage on pin #2 (DELAY), providing for the
hiccup mode of the circuit. Thanks to this control pin, the designer can select the hiccup
mode timing and thus keep the average output current at a safe level. Please note on the left
+5 V(V) @load(A)
+5 V(V) @load(A)
5.08 - 0.018
5.04 - 0.018
4.98 - 0.018
4.92 - 0.018
4.47 - 0.000
5.08 - 0.018
5.04 - 0.018
4.98 - 0.018
4.92 - 0.018
4.47 - 0.000
and
Stand-by consumption at V
Stand-by consumption at V
Figure 15
illustrate the L6599 short-circuit protection sequence described
SH
will not cause any other action, hence providing the system with
+3.3 V(V) @load(A)
+3.3 V(V) @load(A)
3.35 - 0.102
3.35 - 0.079
3.35 - 0.046
3.35 - 0.023
3.35 - 0.000
3.35 - 0.102
3.35 - 0.079
3.35 - 0.046
3.35 - 0.023
3.35 - 0.000
IN
IN
= 115 V
= 230 V
Section 1
SH
ac
ac
is exceeded, an overload protection
and the signal is fed into the ISEN
P
P
OUT
OUT
0.43
0.36
0.24
0.17
0.00
0.43
0.36
0.24
0.17
0.00
Electrical test results
(W)
(W)
SH
) that the
P
P
0.863
0.751
0.582
0.445
0.221
1.138
1.022
0.857
0.740
0.470
IN
IN
(W)
(W)
15/35