RHFL4913 ADJUSTABLE VERSION

Device description

7/16

4

Device description

The RHFL4913 Adjustable contains a PNP type power element controlled by a signal resulting from

amplified comparison between the internal temperature compensated Band-Gap and the fraction of the

desired Output Voltage value obtained from an external resistor divider bridge. The device is protected by

several functional blocks.

4.1

ADJ Pin

The Load output voltage feed-back comes from an external divider resistor bridge middle point connected

to ADJ pin (allowing all possible output voltage settings as per User’s desire) established between Load

terminals.

4.2

INHIBIT ON-OFF Control

By setting INHIBIT pin TTL-High, the Device switches off the Output Current and Voltage. Device is ON

when INHIBIT pin is set Low. Since INHIBIT pin is internally pulled down, it can be left floating in case

Inhibit function is not utilized.

4.3

Overtemperature protection

A temperature detector internally monitors the power element junction temperature. The Device goes

OFF when approx. 175°C are reached, returning to ON mode when back to approx. 40°C. Combined with

other protection blocks, it protects the Device from destructive junction temperature excursions in all load

conditions. It is worth noting that when internal temperature detector reaches 175°C, the active power

element can be at 225°C: Extensive operation under these conditions far exceeds Maximum Operation

Ratings and Device reliability cannot be granted.

4.4

Overcurrent protection

of 10k

4.5

OCM pin

OCM pin is internally pulled-up by a 5 k

4.6

Alternates to

RHFL4913 is recommended to replace all Industry Positive Regulators due to its exceptional Radiation

performance. To replace 3-terminal Industry devices, use RHFL4913 Fixed Voltage versions.