CS52015 datasheet(5/6 Pages) FCI

5 / 6 page

Output Voltage

The CS52015 (adjustable version) develops a 1.25V

reference voltage between the sense pin and the

Adjust pin (Figure 4). Placing a resistor between

these two terminals causes a constant current to

flow though R1 and down though R2 to set the

output voltage. In general R1 is chosen so that this

current is the specified minimum load current of

5 mA. The current out of the Adjust pin is small,

typically 50

A and it adds to the current from R1.

For best regulation the top of the resistor divider

should be connected directly to the Sense pin.

Protection Diodes

In normal operation CS52015 family does not need

any protection diodes between the adjustment pin

and the output and from the output to the input to

prevent die overstress. Internal resistors are

limiting the internal current paths on the ADJ

A protection diode between the output pin and

VPOWER pin is not usually needed.Microsecond

surge currents of 50A to 100A can be handled by

the internal diode between the the output pin and

VPOWER pin of the device.In normal operations it is

Pin.

Therefore even with bypass capacitors on the adjust

pin no protection diode is needed to ensure device

safety under short-circuit conditions. The Adjust

pin can be driver on a transient basis

7V with

respect to the output without any device degradation.

difficult to get those values of surge currents even

with

the use of

large output capacitances. Only

with high value output capacitors, such as 1000

to 5000

F and the VPOWER pin is instantaneously

shorted to ground, damage can occur.A diode from

output to input is recommended (Figure 5).

If CS52015 is connected as a single supply device

with the control and power input pins shorted

together the internal diode between the output and

the power input pin will protect the control input

pin.

Thermal Considerations

The CS52015 series have internal power and thermal

limiting circuitry designed to protect the device

under overload

conditions. However

maximum

junction temperature ratings should not be exceeded

under continuous normal load conditions. Careful

consideration junction to ambient, including junction

-to-case, case-to-heat sink inerface and heat sink

resistance itself.

Junction temperature of the Control section can run

up to 125

. Junction temperature of the power

section can run up to 150

V POWER

Figure 4. Setting Output Voltage

POWER

OUTPUT

CS52015

ADJ1 SENSE

V CONTROL

IADJ

50A

CONTROL

V OUT

V REF

OUT

REF(1+R2/R1)+ ADJ 2

V POWER

Figure 5. Optional Clamp Diodes Protect Against Input

Crowbar Circuits

POWER

OUTPUT

Cs52015

ADJ1 SENSE

V CONTROL

IADJ

50A

OUT

REF(1+R2/R1)+ ADJ 2

CONTROL

V OUT

V REF

CS-52015 1.5Amp Low Dropout Positive Voltage Regulator

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