LM317HVH datasheet(6/15 Pages) NSC

6 / 15 page

Application Hints (Continued)

or less and 10 µF capacitance.

Figure 3 shows an LM117HV

with protection diodes included for use with outputs greater

than 25V and high values of output capacitance.

Current Limit

Internal current limit will be activated whenever the output

current exceeds the limit indicated in the Typical Perfor-

mance Characteristics. However, if during a short circuit con-

dition the regulator’s differential voltage exceeds the Abso-

lute Maximum Rating of 60V (e.g. V

IN ≥ 60V, VOUT = 0V),

internal junctions in the regulator may break down and the

device may be damaged or fail. Failure modes range from an

apparent open or short from input to output of the regulator,

to a destroyed package (most common with the TO-220

package). To protect the regulator, the user is advised to be

aware of voltages that may be applied to the regulator during

fault conditions, and to avoid violating the Absolute Maxi-

mum Ratings.

Note: D1 protects against C1

D2 protects against C2

Schematic Diagram

Typical Applications

DS009062-7

FIGURE 3. Regulator with Protection Diodes

DS009062-8

Slow Turn-On 15V Regulator

DS009062-9

Adjustable Regulator with Improved

Ripple Rejection

DS009062-10

†Solid tantalum

*Discharges C1 if output is shorted to ground

LM317HVH Datasheet(PDF) 6 Page - National Semiconductor (TI)