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VIPER37LE Datasheet(PDF) 5 Page - STMicroelectronics |
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VIPER37LE Datasheet(HTML) 5 Page - STMicroelectronics |
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5 / 35 page  VIPER37 Pin settings Doc ID 022218 Rev 1 5/35 3 Pin settings Figure 3. Connection diagram (top view) Note: The copper area for heat dissipation must be designed under the DRAIN pins. Table 3. Pin description Pin n. Name Function 1 GND This pin represents the device ground and the source of the power section. 2VDD Supply voltage of the control section. This pin also provides the charging current of the external capacitor during startup time. 3CONT 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 the VOVP threshold (see Table 8) shuts the IC down reducing the device consumption. This function is stropped and digitally filtered for high noise immunity. 4FB Control input for duty cycle control. Internal current generator provides bias current for loop regulation. A voltage below the threshold VFBbm activates the burst mode operation. A level close to the threshold VFBlin means that we are approaching the cycle-by-cycle overcurrent set point. 5BR Brownout protection input with hysteresis. A voltage below the threshold VBRth shuts down (not latched) the device and lowers the power consumption. Device operation restarts as the voltage exceeds the threshold VBRth + VBRhyst. It can be connected to ground when not used. 6...10 DRAIN High voltage drain pin. The built-in high voltage switched startup bias current is drawn from this pin too. Pins connected to the metal frame to facilitate heat dissipation. |
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