Operation

SEA05L

4/12

Doc ID 18462 Rev 1

3Vctrl

Inverting input of the voltage loop op-amp. The pin is typically used for the

voltage control loop and is connected to the midpoint of a resistor divider

that senses the output voltage.

4LD

Open-drain output able to sink 5 mA (peak), driven by the internal oscillator

at 1 kHz square waveform with 12.5% duty cycle. The internal mosfet starts

connected to an external LED pilot-lamp with a resistor in series in order to

limit the LED current

5OUT

Common open-drain output of the two internal op-amps. The pin, only able

to sink current, is typically connected to the branch of the optocoupler's

photodiode to transmit the error signal to the primary side.

Supply voltage of the device. A small bypass capacitor (0.1 µF typ.) to GND,

located as close to the IC pins as possible, might be useful to get a clean

supply voltage.

Table 4.

Pin functions (continued)

Pin number

Name

Function