RHFL6000A

Device description

DocID028379 Rev 2

17/31

8

Device description

The RHFL6000A adjustable voltage regulator contains a PNP type power element

controlled by a signal resulting from an 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.

8.1

ADJ pin

The feedback voltage necessary for the loop regulation comes from the load through an

external resistor divider (R1, R2 as in Figure 3: "Typical application diagram") whose mid

point is connected to the ADJ pin (allowing all possible output voltage settings as per user

requirements).

8.2

Inhibit ON-OFF control

By setting the INHIBIT pin to TTL high level , the device switches off. The device is in ON

state when the INHIBIT pin is set low. Since the INHIBIT pin is pulled down internally, it can

be left floating whenever the inhibit function is not used.

8.3

Overtemperature protection

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

device turns off when a temperature of approximately 175 °C is reached, returning to ON

mode when the temperature decreases down to approximately 135 °C.

It should be noted that when the internal temperature detector reaches 175 °C, the active

power element can be as high as 225 °C. Prolonged operation under these conditions may

exceed the maximum operating ratings and device reliability cannot be guaranteed.

8.4

Overcurrent protection

pins, with a typical value range of 10 kΩ to 200 kΩ.

–300 mA, the current

The combination of overcurrent and overtemperature circuits provides RHFL6000A with a

high level of protection against destructive junction temperature excursions in all load

conditions.

8.5

OCM pin

by a 5 kΩ resistor.

It goes to low state when the current limit becomes active. It is buffered and can sink 10

mA.