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參數(shù)資料
| 型號： | XC6401GH11DMR |
| 廠商： | TOREX SEMICONDUCTOR LTD. |
| 英文描述： | Dual LDO Regulators Low ESR Cap Compatible |
| 中文描述： | 雙路LDO穩(wěn)壓器兼容低ESR第 |
| 文件頁數(shù)： | 6/19頁 |
| 文件大?。?/td> | 245K |
| 代理商： | XC6401GH11DMR |
XC6401 Series
Dual LDO Regulators, Low ESR Cap. Compatible
Preliminary
!
OPERATIONAL EXPLANATION
Output voltage control with the XC6401 series:
The voltage divided by resistors R1 & R2 is compared with the internal reference voltage by the error amplifier. The P-Channel MOSFETs,
which are connected to the VOUT1 and VOUT2 pins, are then driven by the subsequent output signal. The output voltages at the VOUT1 and
VOUT2 pins are controlled and stabilized by a system of negative feedback. The current limit circuit and short protect circuit operate in relation
to the level of output current. Further, the IC's internal circuitry can be shutdown via the EN pin's signal.
Low ESR Capacitors
With the XC6401 series, a stable output voltage is achievable even if used with low ESR capacitors as a phase compensation circuit is built-in.
In order to ensure the effectiveness of the phase compensation, we suggest that output capacitors (CL1, CL2) is connected as close as
possible to the output pins (VOUT1 and VOUT2) and the VSS pin. Please use an output capacitor with a capacitance value of at least 1
μ
F. Also,
please connect an input capacitor (CIN) of 0.1
μ
F between the VIN pin and the VSS pin in order to ensure a stable power input.
Current Limiter, Short-Circuit Protection
The XC6401 series includes a combination of a fixed current limiter circuit & a foldback circuit which aid the operations of the current limiter and
circuit protection. When the load current reaches the current limit level, the fixed current limiter circuit operates and output voltage drops. As a
result of this drop in output voltage, the foldback circuit operates, output voltage drops further and output current decreases. When the output
pin is shorted, a current of about 30mA flows.
EN Pins
The IC's internal circuitry can be shutdown via the signal from the EN1 and EN2 pins with the XC6401 series. In shutdown mode, output at the
VOUT1 and VOUT2 pins will be pulled down to the VSS level via R11 & R12 and R21 & R22. The operational logic of the IC's EN1 and EN2
pins are selectable (please refer to the selection guide on page 2). Note that as the standard XC6401FF type's regulator 1 and 2 are both ' High
Active/No Pull Down', operations will become unstable with the EN1 or EN2 pins open. Although the EN1 and EN2 pins are equal to an inverter
input with CMOS hysteresis, with either the pull-up or pull-down options, the EN1 and EN2 pins input current will increase when the IC is in
operation. We suggest that you use this IC with either a VIN voltage or a VSS voltage input at the EN1 and EN2 pins. If this IC is used with the
correct specifications for the EN1 and EN2 pins, the operational logic is fixed and the IC will operate normally. However, supply current may
increase as a result of through current in the IC's internal circuitry.
!
NOTE ON USE
1
Please use this IC within the stated absolute maximum ratings.
The IC is liable to malfunction should the ratings be exceeded.
2
Where wiring impedance is high, operations may become unstable due to noise and/or phase lag
depending on output current. Please keep the resistance low between VIN and VSS wiring in particular.
3
Please wire the input capacitor (CIN) and the output capacitors (CL1, CL2) as close to the IC as possible.
Current
Limit
Error
Amp1
ON/OFF
Control
VR1
Each
Circuit
VR2
Each
Circuit
Voltage
Reference
VOUT1
EN1
EN2
VIN
VSS
R11
R12
R21
R22
VOUT2
+
-
ON/OFF
Control
Current
Limit
+
-
Error
Amp2
Semiconductor Ltd.
Data Sheet
6
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| XC6401HE01ML | 制造商:TOREX 制造商全稱:Torex Semiconductor 功能描述:Dual LDO Regulators, Low ESR Cap. Compatible |
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