EVL185W-LEDTV STMicroelectronics, EVL185W-LEDTV Datasheet - Page 23

• Manufacturer Part Number: EVL185W-LEDTV
• Description: DEMO BOARD VIPER27L L6564 L6599A
• Manufacturer: STMicroelectronics
• Series: VIPER™r

Specifications of EVL185W-LEDTV

• Design Resources: EVL185W-LED BOM EVL185W-LED Schematic
• Main Purpose: Power Supply with PFC
• Outputs And Type: 4, Isolated
• Power - Output: 185W
• Voltage - Output: 130V, 24V, 12V, 5V
• Current - Output: 620mA,2A, 4A, 2A
• Voltage - Input: 90 ~ 264VAC
• Regulator Topology: -
• Frequency - Switching: -
• Board Type: Fully Populated
• Utilized Ic / Part: Viper27L, L6564, L6599A
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-11255

AN3339
Figure 38. 12 V load transition
CH1: +130 V
CH3: +12 V
Figure 40. 130 V load transition
The L6599A is equipped with a current sensing input (pin #6, ISEN) and a dedicated
overcurrent management system. The current flowing in the resonant tank is detected and
the signal is fed into the ISEN pin. It is internally connected to a first comparator referenced
to 0.8 V, and to a second comparator referenced to 1.5 V.
overload occurrence. If the voltage externally applied to ISEN exceeds 0.8 V, an internal
switch is turned on and discharges the soft-start capacitor CSS. This operation results in a
nearly constant peak primary current limiting the output power. At the same time, an internal
150 µA current generator, which, via the DELAY pin, charges C37, is activated. Because the
DELAY and DIS pins short each other, if the voltage on C37 reaches 1.85 V, the L6599A
stops switching and the PFC_STOP pin is pulled low disabling also the PFC.
An off-on recycle is necessary to restart the converter. By dimensioning C37 and R54, the
designer can set the maximum time that the converter is allowed to run overloaded or under
short-circuit conditions. Overloads or short-circuits lasting less than the set time do not
CH4: +12 V o/p current
CH2: +24 V
CH1: +130 V
CH3: +12 V
Doc ID 18449 Rev 1
Figure 39. 24 V load transition
CH1: +130 V
CH3: +12 V
CH2: +24 V
CH4: +130 V o/p current
Figure 41
CH4: +24 V o/p current
CH2: +24 V
shows an example of
Functional check
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