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參數(shù)資料
| 型號： | 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)： | 8/17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
8
Functional Description
General
APL5332 is a source-sink linear regulator designed
for motherboard front side bus. The device can supply
loads from -1A to 2A in either fixed or adjustable volt-
age mode. APL5332 has a 0.8V reference, an error
amplifier, two pass transistors, fixed voltage selection,
an internal feedback resistor-divider, soft-start control
and fault protections(current-limit and thermal
shutdown). The output voltage is either 1.225V or 1.
45V selected by the BS pin when fixed voltage mode
is active by setting FB=VIN. When the FB is con-
nected with a feedback resistor-divider, the IC oper-
ates in adjustable voltage mode and the voltage of FB
is regulated to 0.8V. In the mode, the input of BS pin
is ignored. APL5332 is available in the SOP, SOP-8-
P, and TO-252-5 packages to meet different power
dissipation applications.
Output Voltage Regulation
The error amplifier working with the temperature-com-
pensated 0.8V reference and the two pass transistors
(high-side and low-side) regulates the output to the
preset voltage. The error amplifier compares the refer-
ence with the feedback voltage and amplifies the dif-
ference to drive one of the pass transistors. The high-
side pass transistor provides current from VIN to VOUT
and increases the output voltage when the feedback
voltage is lower than the reference. The low-
side pass
transistor provides current from VOUT to GND and de-
creases the output voltage when the feedback voltage is
higher than the reference. The two pass transistors are
well controlled by the error amplifier and prevented short-
through conditions. An internal output voltage sense pad
is bonded to the VOUT pin for perfect load regulation in
fixed voltage mode.
Current Limit
The APL5332 monitors the sourcing or sinking cur-
rents and limits the maximum output current to pre-
vent damages during overload or short-circuit
conditions.
Power-On-Reset and Soft-Start
A Power-On-Reset circuit monitors input voltage of
the VIN pin and prevents wrong logic controls. When
the input voltage rises up more than the Power-On-
Reset threshold voltage, the device starts to output
current. Therefore, a soft-start circuit which controls
the reference voltage to rise up is required, limiting
surge input currents. The typical soft-start interval is
about 1mS.
Thermal Shutdown
A thermal shutdown circuit limits the junction tem-
perature of the APL5332. When the junction tempera-
ture exceeds +150
o
C, a thermal sensor turns off the
both pass transistors, allowing the device to cool
down. The regulator starts to regulate again after the
junction temperature cools by 25
o
C, resulting in a
pulsed output during continuous thermal overload
conditions. The thermal shutdown designed with a 25
o
C
hysteresis lowers the average junction temperature
during continuous thermal overload conditions, extend-
ing life time of APL5332.
For normal operation, device power dissipation should
be externally limited so that junction temperatures will
not exceed +125
o
C.
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