EV4034-S-00D – UNIVERSAL INPUT, 3.5W GU10 LED DRIVER

EV4034-S-00D Rev.1.01

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5

11/5/2015

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CIRCUIT DESCRIPTION

The EV4034-S-00D is configured for non-

isolation

control topology, It can simplify the

schematic and reduce BOM costs. It can also

achieve an accurate LED current.

The input stage consists of FR1 and BD1. FR1 is

protects against component failure or some

excessive short events, and can restrain the

inrush current.

The π filter (C1, L1 and C2) guarantees that the

conducted EMI meets the EN55015 standard.

R2, C3 and D1 provide the VCC power supply.

The resistor divider (R3 and R4) provides lamp

open protection by sampling the voltage on the

auxiliary winding. When an open circuit occurs,

the output voltage remains constant.

T1 is the power transformer, the structure of

which is also very important to pass EMI test.

D2, C4 and R5 compose output circuit. D2 is a

schottky diode for better efficiency. C4 is a

ceramic capacitor for lower output voltage ripple

and R5 is the dummy load for lamp open

protection..