RHFL4913SCA-01V STMICROELECTRONICS [STMicroelectronics], RHFL4913SCA-01V Datasheet - Page 7

• Manufacturer Part Number: RHFL4913SCA-01V
• Description: Rad-Hard Adjustable positive voltage regulator
• Manufacturer: STMICROELECTRONICS [STMicroelectronics]

RHFL4913 ADJUSTABLE VERSION
4
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
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
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
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
An internal non-fold back Short-Circuit limitation is set with I
downward modified by an external resistor connected between I
of 10k
maximum desired application I
Regulation and V
required, I
4.5
Goes Low when current limit starts to be active, otherwise V
OCM pin is internally pulled-up by a 5 k
4.6
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.
Ω
to 200k
Device description
ADJ Pin
INHIBIT ON-OFF Control
Overtemperature protection
Overcurrent protection
OCM pin
Alternates to
SC
pin must be left unbiased (as it is in 3pin packages).
Ω
. To keep excellent V
O
starts to drop and OCM flag is risen. When no current limitation adjustment is
O
. When I
O
regulation, it is necessary to set I
Ω
resistor.
O
reaches I
SHORT
SHORT
OCM
SC
– 300mA, the current limitor overrules
= V
and V
> 3.8A (V
I
. It is buffered and can sink 10mA.
SHORT
I
pins, with a typical value range
O
1.6 times greater than the
is 0V). This value can be
Device description
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