L6932 데이터 시트보기 (PDF) - STMicroelectronics

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L6932

HIGH PERFORMANCE 2A ULDO LINEAR REGULATOR

STMicroelectronics 

L6932

Multilayer ceramic caps have the lowest ESR and can be required for particular applications. Nevertheless in

several applications they are ok, the loop stability issue has to be considered (see loop stability section).

Below a list of some suggested capacitor manufacturers.

Manufacturer

Type

Cap Value (µF)

Rated Voltage (V)

PANASONIC

CERAMIC

1 to 47

4 to 16

TAYO YUDEN

CERAMIC

1 to 47

4 to 16

TDK

CERAMIC

1 to 47

4 to 16

TOKIN

SANYO

PANASONIC

KEMET

CERAMIC

POSCAP

SP

TANTALUM

1 to 47

1 to 47

1 to 47

1 to 47

4 to 16

4 to 16

4 to 16

4 to 16

Loop Stability

The stability of the loop is affected by the zero introduced by the output capacitor.

The time constant of the zero is given by:

T = ESR ⋅ COUT

FZERO

=

---------------------1-----------------------

2π ⋅ ESR ⋅ COUT

This zero helps to increase the phase margin of the loop until the time constant is higher than some hundreds

of nsec, depending also on the output voltage and current.

So, using very low ESR ceramic capacitors could produce oscillations at the output, in particular when regulating

high output voltages (adjustable version).

To solve this issue is sufficient to add a small capacitor (e.g. 1nF to 10nF) in parallel to the high side resistor of

the external divider, as shown in figure 9.

Figure 9. Compensation Network

VIN=2V TO 14V

C1

IN

2

OUT

4

L6932D1.2

EN

1

5

67

GND

R1

ADJ

3

8

R2

VOUT=1.2V TO 5V UP to 2A

C3

C2

Thermal Considerations

Since the device is housed in a small SO(4+2+2) package the thermal issue can be the bottleneck of many ap-

plications. The power dissipated by the device is given by:

PDISS = (VIN - VOUT) · IOUT

7/11

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