VIPER17HD Ver la hoja de datos (PDF) - STMicroelectronics
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VIPER17HD Datasheet PDF : 33 Pages
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VIPER17
3
Pin settings
3.1
Connection diagram
Figure 3. Connection diagram (top view)
GND
VDD
CONT
FB
Pin settings
DRAIN
DRAIN
BR
3.2
Pin description
Table 3. Pin description
Pin N.
DIP-7 SO16
Name
Function
1
1...4
GND This pin represents the device ground and the source of the power section.
2
5
VDD
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
3
6
CONT resistor.
2. output voltage monitoring. A voltage exceeding 3 V shuts the IC down
reducing the device consumption. This function is strobed and digitally filtered for
high noise immunity.
Control input for duty cycle control. Internal current generator provides bias
4
7
FB
current for loop regulation. A voltage below 0.5 V activates the burst-mode
operation. A level close to 3.3 V means that we are approaching the cycle-by-
cycle over-current set point.
Brownout protection input with hysteresis. A voltage below 0.45 V shuts down
5
10
BR
(not latch) the device and lowers the power consumption. Device operation
restarts as the voltage exceeds 0.45 V plus hysteresis voltage. It can be
connected to ground when not used.
7,8
13...16
DRAIN
High voltage drain pin. The built-in high voltage switched start-up bias current is
drawn from this pin too.
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