CS5203 datasheet(5/6 Pages) FCI

5 / 6 page

The CS5203 (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 through R1

and down through R2 to set the output voltage. In general

R1 is chosen so that this current is the specified minimum

loadcurrentof 5 mA. The currentoutof the Adjust pin is

small, typically 50 A and

For best regulation the top of the resistor divider should

be connected directly to the Sense pin.

In normal operation the CS5203 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 limit the internal

current paths on the ADJ pin.Therefore even with bypass

capacitors on the adjust pin no prote ction 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.

A protection diode betweenthe Output pin and V POWER

pin is not usually needed. Micros econd surge currents of

50A to 100A can be handled by the internal diode

between the Output pin and VPOWER

pin of the device.

Output Voltage

Protection Diodes

surge currents even with the use of large output

capacitances. Only with high value output capacitors,

such as 1000

F to 500 0

F and the V

pin is

POWER

instantaneously shorted to ground, damage can occur.

A diode from output to input is recommended (Fig. 5)

If CS5203 is connected as a single supply device with the

control and power input pins shorted to get the internal

diode between the output and the power input pin

will protect the control input pin.

The CS 5203 series have internal power and thermal

limiting circuitry designed to protect the device under

overload conditions. However maxium junction

temperature ratings should not be exceeded under

continuous normal load conditions.Careful consideration

must be given to all sources ofthermal resistance from

junction to ambient, including junction-to-case, case-to-

heatsink interface 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

T h e r m a l C o n s id e r a tio n s

CONTROL

R 2

R 1

D 1

D 2

V OU T

V CONTROL

V POWER

V POW ER

C S 5203

AD J

P O W E R

O UT P UT

S E NS E

F igure 4 . Setting Output Voltage

(1+R2/R1)+

ADJ

OUT

REF

F igure 5 . Optional Clamp Diodes Protect against Input

Crowbar Circuits

IADJ

V REF

CS-5203 3 Amp Low Dropout Positive Voltage Regulator

control

In normal operations it is difficult to get those values of

it adds to the current from R1.

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