CS5206-1GDP3(2006) データシートの表示（PDF） - ON Semiconductor

部品番号

コンポーネント説明

メーカー

CS5206-1GDP3
(Rev.:2006)

6.0 A Adjustable, and Fixed 3.3 V and 5.0 V Linear Regulators

ON Semiconductor 

CS5206−1, CS5206−3, CS5206−5

CS5206−X the transient response and stability improve with

higher values of capacitor. The majority of applications for

this regulator involve large changes in load current so the

output capacitor must supply the instantaneous load current.

The ESR of the output capacitor causes an immediate drop

in output voltage given by:

DV + DI ESR

For microprocessor applications it is customary to use an

output capacitor network consisting of several tantalum and

ceramic capacitors in parallel. This reduces the overall ESR

and reduces the instantaneous output voltage drop under

load transient conditions. The output capacitor network

should be as close as possible to the load for the best results.

Protection Diodes

When large external capacitors are used with a linear

regulator it is sometimes necessary to add protection diodes.

If the input voltage of the regulator gets shorted, the output

capacitor will discharge into the output of the regulator. The

discharge current depends on the value of the capacitor, the

output voltage and the rate at which VIN drops. In the

CS5206−X family of linear regulators, the discharge path is

through a large junction and protection diodes are not

usually needed. If the regulator is used with large values of

output capacitance and the input voltage is instantaneously

shorted to ground, damage can occur. In this case, a diode

connected as shown in Figures 11 and 12 is recommended.

VIN

C1

IN4002 (optional)

VIN

VOUT

CS5206−1

Adj

VOUT

R1

C2

Output Voltage Sensing

Since the CS5206−X is a three terminal regulator, it is not

possible to provide true remote load sensing. Load

regulation is limited by the resistance of the conductors

connecting the regulator to the load. For best results the

fixed regulators should be connected as shown in Figure 13.

Conductor Parasitic

VIN

VIN

VOUT

RC Resistance

CS5206−X

RLOAD

Gnd

Figure 13. Conductor Parasitic Resistance can be

Minimized with the Above Grounding Scheme for

Fixed Output Regulators

For the adjustable regulator, the best load regulation

occurs when R1 is connected directly to the output pin of the

regulator as shown in Figure 14. If R1 is connected to the

load, RC is multiplied by the divider ratio and the effective

resistance between the regulator and the load becomes

ǒ Ǔ RC

R1 ) R2

R1

where RC = conductor parasitic resistance.

VIN

VIN

VOUT

Conductor Parasitic

RC

Resistance

CS5206−1

R1

Adj

RLOAD

CAdj

R2

R2

Figure 11. Protection Diode Scheme for Adjustable

Output Regulator

VIN

C1

IN4002 (optional)

VIN

VOUT

CS5206−1

Gnd

VOUT

C2

Figure 12. Protection Diode Scheme for Fixed Output

Regulators

Figure 14. Grounding Scheme for Adjustable Output

Regulator to Minimize Parasitics

Calculating Power Dissipation and Heat Sink

Requirements

The CS5206−X series of linear regulators includes

thermal shutdown and safe operating area circuitry to

protect the device. High power regulators such as these

usually operate at high junction temperatures so it is

important to calculate the power dissipation and junction

http://onsemi.com

6

Share Link: