VIPER26 STMicroelectronics, VIPER26 Datasheet - Page 4

• Manufacturer Part Number: VIPER26
• Description: VIPerPlus family: fixed frequency high performance off line high voltage converter
• Manufacturer: STMicroelectronics

Pin settings
3
Note:
4/25
Pin settings
Figure 3.
The copper area for heat dissipation has to be designed under the DRAIN pins.
Table 3.
DIP-7 SO16
7,8
1
2
3
4
5
-
Pin n.
13-16 DRAIN
1-2
4
5
6
7
8
Connection diagram (top view)
Pin description
COMP
Name
GND
VDD
N.A.
LIM
FB
Connected to the source of the internal power MOSFET and controller
ground reference.
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 provides the charging current
of the external capacitor.
This pin allows setting the drain current limitation. The limit can be reduced
by connecting an external resistor between this pin and GND. Pin left open if
default drain current limitation is used.
Inverting input of the internal trans conductance error amplifier. Connecting
the converter output to this pin through a single resistor results in an output
voltage equal to the error amplifier reference voltage (See V
Table
Output of the internal trans conductance error amplifier. The compensation
network have to be placed between this pin and GND to 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 V
(Table
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). An external resistors divider is required for higher output voltages.
7).
Doc ID 17736 Rev 2
Function
COMPL
FB_REF
to V
COMPH
VIPER26
on