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參數(shù)資料
| 型號(hào)： | LP2975IMMX-5.0 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | MOSFET LDO Driver/Controller |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | MINI, SOP-8 |
| 文件頁(yè)數(shù)： | 7/19頁(yè) |
| 文件大?。?/td> | 715K |
| 代理商： | LP2975IMMX-5.0 |
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Typical Performance Characteristics
Unless otherwise specified: T
A
= 25C, C
IN
= 1 μF, ON/OFF pin
is tied to 1.5V. (Continued)
Reference Designs
The LP2975 controller can be used with virtually any
P-channel MOSFET to build a wide variety of linear voltage
regulators.
Since it would be impossible to document all the different
voltage and current combinations that could be built, a num-
ber of reference designs will be presented along with perfor-
mance data for each.
THE PERFORMANCE DATA SHOWN IS ACTUAL TEST
DATA, BUT IS
NOT GUARANTEED
.
DESIGN
#
1: V
OUT
= 5V
@
5A
(Refer to Typical Application
Circuits)
COMPONENTS:
C
IN
= 82 μF Aluminum Electrolytic
C
OUT
= 120 μF Aluminum Electrolytic
C
F
= 220 pF
R
SC
= 10 m
P-FET = NDP6020P
Heatsink: (assuming V
≤
7V and T
≤
60C) if protection
against a continuousshort-circuit is required, a heatsink with
θ
≤
1.5 C/W must be used. However, if continuous short-
circuit survivability is not needed, a heatsink with
θ
S-A
≤
6 C/W is adequate.
PERFORMANCE DATA:
Dropout Voltage
Dropout voltage is defined as the minumum input-to-output
differential voltage required by the regulator to keep the out-
put in regulation. It is measured by reducing V
until the out-
put voltage drops below the nominal value (the nominal
value is the output voltage measured with V
IN
= 5.5V). I
L
=
5A for this test.
DROPOUT VOLTAGE = 323 mV
Load Regulation
Load regulationis defined as the maximum change in output
voltage as the load current is varied. It is measured by
changing the load resistance and recording the minimum/
maximum output voltage. The measured change in output
voltage is divided by the nominal output voltage and ex-
pressed as a percentage. V
IN
= 5.6V for this test.
5 mA
≤
I
L
≤
5A: LOAD REGULATION = 0.012%
0
≤
I
L
≤
5A: LOAD REGULATION = 0.135%
Line Regulation
Line regulation is defined as the maximum change in output
voltage as the input voltage is varied. It is measured by
changing the input voltage and recording the minimum/
maximum output voltage. The measured change in output
voltage is divided by the nominal output voltage and ex-
pressed as a percentage. I
L
= 5A for this test.
5.4V
≤
V
IN
≤
10V: LINE REGULATION = 0.03%
Output Noise Voltage
Output noise voltage was measured by connecting a wide-
band AC voltmeter (HP 400E) directly across the output ca-
pacitor. V
IN
= 6V and I
L
= 5A for this test.
NOISE = 75 μV (rms)
Transient Response
Transient response is defined as the change in output volt-
age which occurs after the load current is suddenly changed.
V
IN
= 5.6V for this test.
The load resistor is connected to the regulator output using a
switch so that the load current increases from 0 to 5A
abruptly. The change in output voltage is shown in the scope
photo below (the vertical scale is 200 mV/division and the
horizontal scale is 10 μs/division). The regulator nominal out-
put (5V) is located on the center line of the photo.
The output shows a maximum change of about 600 mV
compared to nominal. This is due to the relatively small out-
put capacitor chosen for this design. Increasing C
OUT
greatly
improves transient response (see Designs
#
2 and
#
3).
Controller Gain and Phase Response
DS100034-36
www.national.com
7
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LP2978AY-3.8 WAF | 制造商:Texas Instruments 功能描述: |
| LP2978IM5-3.8 | 制造商:Rochester Electronics LLC 功能描述:50MA LDO REGULATOR, LOW-NOISE - Bulk 制造商:Texas Instruments 功能描述: |
| LP2978IM5X-3.8 | 制造商:Rochester Electronics LLC 功能描述:50MA LDO REGULATOR, LOW-NOISE - Bulk 制造商:Texas Instruments 功能描述: |
| LP2980-1.57BUP6 WAF | 制造商:Texas Instruments 功能描述: |
| LP2980-3.3BUP6 WAF | 制造商:Texas Instruments 功能描述: |
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