Datasheet

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
to switch when V
CC
is above the turn-on threshold (typ. 3 V) and it is off (LD
high impedance) when V
CC
is below the UVLO of the IC. The pin can be
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.
6V
CC
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