VIPER28 STMicroelectronics, VIPER28 Datasheet - Page 4

• Manufacturer Part Number: VIPER28
• Description: VIPerPlus family: fixed frequency high performance off line high voltage converter
• Manufacturer: STMicroelectronics

Pin settings
3
Note:
Table 3.
4/32
SDIP10
6...10
1
2
3
4
5
-
Pin n.
DIP-7
7,8
1
2
3
4
5
-
Pin settings
Figure 3.
The copper area for heat dissipation has to be designed under the DRAIN pins.
Pin description
SO16N
13...16 DRAIN
1...2
4
5
6
7
8
Connection diagram (top view)
CONT
Name
GND
VDD
N.A.
EPT
FB
This pin represents the device ground and the source of the power section.
Function: Not available for user. It can be connected to GND (pins 1-2) or left
not connected.
Supply voltage of the control section. This pin also provides the charging
current of the external capacitor during start-up time.
Control pin. The following functions can be selected:
1. current limit set point adjustment. The internal set default value of the cycle-
by-cycle current limit can be reduced by connecting to ground an external
resistor.
2. output voltage monitoring. A voltage exceeding V
on page
is strobed and digitally filtered for high noise immunity.
Control input for duty cycle control. Internal current generator provides bias
current for loop regulation. A voltage below the threshold V
burst-mode operation. A level close to the threshold V
approaching the cycle-by-cycle over-current set point.
This pin allows the connection of an external capacitor for the extra power
management. If the function is not used, the pin has to be connected to GND.
High voltage drain pin. The built-in high voltage switched start-up bias current
is drawn from this pin too.
Pins connected to the metal frame to facilitate heat dissipation.
7) shuts the IC down reducing the device consumption. This function
Doc ID 15028 Rev 4
Function
OVP
FBlin
threshold (see
means that we are
FBbm
activates the
VIPER28
Table 8