HVLED815PF datasheet(8/36 Pages) STMICROELECTRONICS

8 / 36 page

Pin description and connection diagrams

HVLED815PF

8/36

Doc ID 023409 Rev 4

2.2

Thermal data

3VCC

Supply voltage of the device.

A capacitor, connected between this pin and ground, is initially charged by the

internal high-voltage startup generator; when the device is running, the same

generator keeps it charged in case the voltage supplied by the auxiliary winding

is not sufficient. This feature is disabled in case a protection is tripped. A small

bypass capacitor (100 nF typ.) to GND may be useful to get a clean bias voltage

for the signal part of the IC.

4GND

Ground.

Current return for both the signal part of the IC and the gate drive. All of the

ground connections of the bias components should be tied to a trace going to this

pin and kept separate from any pulsed current return.

5ILED

Constant current (CC) regulation loop reference voltage.

An external capacitor CLED is connected between this pin and GND. An internal

circuit develops a voltage on this capacitor that is used as the reference for the

MOSFET’s peak drain current during CC regulation. The voltage is automatically

adjusted to keep the average output current constant.

6DMG

Transformer demagnetization sensing for quasi-resonant operation and output

voltage monitor.

A negative-going edge triggers the MOSFET turn-on, to achieve quasi-resonant

operation (zero voltage switching).

The pin voltage is also sampled-and-held right at the end of transformer

demagnetization to get an accurate image of the output voltage to be fed to the

inverting input of the internal, transconductance-type, error amplifier, whose non-

inverting input is referenced to 2.5 V. The maximum IDMG sunk/sourced current

must not exceed ± 2 mA (AMR) in all the Vin range conditions.

No capacitor is allowed between the pin and the auxiliary transformer.

7COMP

Output of the internal transconductance error amplifier. The compensation

network is placed between this pin and GND to achieve stability and good

dynamic performance of the voltage control loop.

N.a.

Not available. These pins must be connected to GND.

9-11

N.a.

Not available. These pins must be left not connected.

N.c.

Not internally connected. Provision for clearance on the PCB to meet safety

requirements.

13 to

DRAIN

Drain connection of the internal power section.

The internal high-voltage startup generator sinks current from this pin as well.

Pins connected to the internal metal frame to facilitate heat dissipation.

Table 2.

Pin description (continued)

Name

Function

Table 3.

Thermal data

Symbol

Parameter

Max. value

Unit

RthJP

Thermal resistance, junction-to-pin

°C/W

RthJA

Thermal resistance, junction-to-ambient

110

°C/W

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