VIPER15HDTR datasheet(5/40 Pages) STMICROELECTRONICS

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VIPER15

Pin settings

Doc ID 15455 Rev 5

5/40

Pin settings

Figure 3.

Connection diagram (top view)

Note:

The copper area for heat dissipation has to be designed under the DRAIN pins.

Table 3.

Pin description

Pin n.

Name

Function

DIP-7

SO16

1...2

GND

This pin represents the device ground and the source of the power section.

-4

N.A.

Not available for user. It can be connected to GND (pins 1-2) or left not

connected.

VDD

Supply voltage of the control section. This pin also provides the charging

current of the external capacitor during power-up.

ZCD

This is a multifunction pin.

1. Input for the zero current detection circuit for transformer demagnetization

sensing. (i.e. RLIM, RFF, ROVP and DOVP, Figure 32)

2. User defined drain current limit set-point and voltage feed forward.The

resistor, RLIM, connected between ZCD pin and GND causes the current

IZCD and then it limits the static maximum drain current.

3. The resistor RFF, between ZCD pin and the auxiliary winding, performs

the feed-forward operation and then the drain current limitation changes

according to the converter input voltage.

4. Output overvoltage protection. A voltage exceeding VOVP threshold,

(see Table 8 on page 8), 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

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.

Brownout protection input with hysteresis. A voltage below the threshold

VBRth shuts down (not latch) 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.

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. Pins connected to the metal frame to

facilitate heat dissipation.

Obsolete

Product(s)

- Obsolete

Product(s)

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