HVLED807PFTR STMicroelectronics, HVLED807PFTR Datasheet - Page 13

• Manufacturer Part Number: HVLED807PFTR
• Description: LED Lighting Drivers Off-Line LED 7W 0.9 800V PSR 11 Ohm
• Manufacturer: STMicroelectronics

Specifications of HVLED807PFTR

• Rohs: yes
• Input Voltage: 11.5 V to 23 V
• Maximum Supply Current: 1.7 mA
• Mounting Style: SMD/SMT
• Package / Case: SO-16N
• Power Dissipation: 0.9 W

HVLED807PF
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Device description
The HVLED807PF is a high-voltage primary switcher intended to operate directly from the
rectified mains with minimum external parts to provide high power factor (> 0.90) and an
efficient, compact and cost effective solution for LED driving. It combines a high-
performance low-voltage PWM controller chip and an 800 V, avalanche-rugged Power
MOSFET, in the same package.
The PWM is a current-mode controller IC specifically designed for ZVS (zero voltage
switching) flyback LED drivers, with constant output current (CC) regulation using primary
sensing feedback (PSR). This eliminates the need for the optocoupler, the secondary
voltage reference, as well as the current sense on the secondary side, while still maintaining
a good LED current accuracy. Moreover, it guarantees a safe operation when short-circuit of
one or more LEDs occurs.
The device can also provide a constant output voltage regulation (CV): it allows the
application to be able to work safely when the LED string opens due to a failure.
In addition, the device offers the shorted secondary rectifier (i.e. LED string shorted due to a
failure) or transformer saturation detection.
Quasi-resonant operation is achieved by means of a transformer demagnetization sensing
input that triggers MOSFET turn-on. This input serves also as both output voltage monitor,
to perform CV regulation, and input voltage monitor, to achieve mains-independent CC
regulation (line voltage feedforward).
The maximum switching frequency is top-limited below 166 kHz, so that at medium-light
load a special function automatically lowers the operating frequency still maintaining the
operation as close to ZVS as possible. At very light load, the device enters a controlled
burst-mode operation that, along with the built-in high-voltage startup circuit and the low
operating current of the device, helps minimize the residual input consumption.
Although an auxiliary winding is required in the transformer to correctly perform CV/CC
regulation, the chip is able to power itself directly from the rectified mains. This is useful
especially during CC regulation, where the flyback voltage generated by the winding drops.
Doc ID 023464 Rev 4
Device description
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