SEA05 Datasheet, PDF (2/10 Pages) STMicroelectronics – Advanced constant voltage and constant current controller

Pin description
1
Pin description
Figure 2. Pin configuration
SEA05
Isense 1
GND ₂
Vctrl 3
6 Vcc
5 Out
4 Ictrl
Note:
The adjacent pins have the same AMR to increase the robustness of the IC against
accidental short circuit among pins.
Table 2. Pin description
n.
Name
Function
1
Isense
Inverting input of the current loop op-amp. The pin is tied to the cold end of the
current sense resistor through a decoupling resistor.
Ground. Return of the bias current of the device. 0 V reference for all voltages.
2
GND The pin should be tied as close to the ground output terminal of the converter as
possible to minimize load current effect on the voltage regulation setpoint.
3
Vctrl
Inverting input of the voltage loop op-amp. The pin is tied to the mid-point of a
resistor divider that senses the output voltage.
4
Ictrl
Non-inverting input of the current loop op-amp. It is tied directly to the hot
(negative) end of the current sense resistor
Common open-drain output of the two internal op-amps. The pin, able to sink
5
OUT current only, is 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,
6
Vcc located as close to IC’s pins as possible, might be useful to get a clean supply
voltage.
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Doc ID 17014 Rev 1