Data Breif VIPER26K (STMicroelectronics) - 2

Pin description VIPer26K 1 Pin description Figure 1. Connection diagram
Note: A PCB copper area has to be provided under DRAIN pins to heat dissipation.
Table 1. Pin description SO16N Name Function Ground
. Connected to the source of the internal power MOSFET and 1 GND controller ground reference.
Not internally connected
. It is highly recommended to connect it to GND 2, 3 N.C. (pin 1) or leave floating.
Not available for user
. This pin is mechanically connected to the 4 N.A. controller die pad of the frame. In order to improve the noise immunity, it is highly recommended to connect it to GND (pin 1).
Supply voltage of the control section
. This pin provides the charging 5 VCC current of the external capacitor.
Not available for user
. It is highly recommended to connect it to GND 6 N.C. (pin 1).
Inverting input of the internal trans-conductance error amplifier
. Connecting the converter output to this pin through a single resistor 7 FB results in an output voltage equal to the error amplifier reference voltage. An external resistors divider is required for higher output voltages.
Output of the internal trans conductance error amplifier
. The compensation network has to be placed between this pin and GND to 8 COMP achieve stability and good dynamic performance of the voltage control loop. The pin is used also to directly control the PWM with an optocoupler. The linear voltage range extends from VCOMPL to VCOMPH. 9 - 12 N.C.
Not internally connected
. It can be connected to GND or left floating.
High voltage drain pin
. The built-in high voltage switched start-up bias 13 - 16 DRAIN current is drawn from this pin too. Pins connected to the metal frame to facilitate heat dissipation. 2/7 DB3809 Rev 1 Document Outline 1 Pin description Figure 1. Connection diagram Table 1. Pin description 2 Electrical characteristics Table 2. Electrical and thermal characteristics Figure 2. Typical isolated flyback configuration with secondary regulation Figure 3. Typical isolated flyback configuration with primary regulation Figure 4. Typical non-isolated flyback configuration 3 Ordering information Table 3. Order codes 4 Revision history Table 4. Document revision history