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參數(shù)資料
| 型號(hào)： | APL5332KAC-TRL |
| 廠商： | Anpec Electronics Corporation |
| 英文描述： | Silver Mica Capacitor; Capacitance:33000pF; Capacitance Tolerance:+/- 1%; Series:CD30; Voltage Rating:100VDC; Capacitor Dielectric Material:Mica; Termination:Radial Leaded; Lead Pitch:11.1mm; Leaded Process Compatible:No RoHS Compliant: No |
| 中文描述： | CMOS低壓與源庫 |
| 文件頁數(shù)： | 9/17頁 |
| 文件大?。?/td> | 161K |
| 代理商： | APL5332KAC-TRL |
Copyright
ANPEC Electronics Corp.
Rev. A.3 - Oct., 2003
APL5332
www.anpec.com.tw
9
Application I nformation
Internal Parasitic Diode
Do not apply a voltage to VOUT when the voltage ap-
plied at VIN is not present. The reason is the internal
parasitic diodes from VOUT to VIN will conduct due to
the forward-voltage applied at VOUT.
Output Voltage Selection
The APL5332 allows operation in either fixed voltage
or adjustable mode. Connecting FB to VIN selects
fixed output voltage which is either 1.225V or 1.45V
by setting the BS pin to be logic “High” or “Low”. The
output voltage may also be adjusted by connecting a
resistor-divider from VOUT to FB to GND (See the
Typical Application Circuit). Selecting R2 in the 100
to 5k
range ignors the voltage offset caused by the
internal pull-up current of FB. Calculate R1 with the
following equation:
R1 = R2 [(V
OUT
/ V
REF
) - 1]
where V
REF
= 0.8V.
The output voltage selection table is :
Output Capacitor
The APL5332 requires a proper output capacitor to
maintain stability and improve transient response. The
output capacitor selection is dependent upon the ESR
(equivalent series resistance) and capacitance over
temperature and current ranges. The following chart
shows a stable region to select output capacitor for
APL5332. This region above the curve indicates mini-
mum required ESR and capacitance to maintain
stability. However, the output capacitor should have
an ESR less than1
.
H
L
H
L
1.225V
Adjustable
1.45V
Adjustable
FB
BS
Ultra-low-ESR capacitors, such as ceramic chip
capacitors, may promote unstable or under-damped
transient response, but proper ceramic chip capaci-
tors placed near loads can be used as decoupling
capacitors. A low-ESR solid tantalum and aluminum
electrolytic capacitor (ESR<1
) works extremely well
and provides good transient response and stability over
temperature.
0
20
40
60
80
100
10
100
1000
Capacitance(
μ
F)
Stable Region
E
)
The output capacitors are also used to reduce the slew
rate of load current and help the APL5332 to minimize
variations of the output voltage, improving transient
response. For this purpose, the low-ESR capacitors
are recommended.
Input Capacitor
The VIN input capacitor is not required for stability but
for supplying surge currents during large load transients,
preventing the input rail from dropping and improving
performance of APL5332. The parasitic inductors from
the voltage sources or other bulk capacitors to the
VIN pins will limit the slew rate of the surge currents
during large load transients, resulting in voltage drop
at VIN pin.
An aluminum electrolytic capacitor (>47
μ
F) is recom-
mended for VIN pin, and It is not necessary to use
low-ESR capacitors.
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