參數(shù)資料
型號(hào)： LP2975AIMM-12/NOPB
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO8
封裝： MINI, SOP-8
文件頁(yè)數(shù)： 20/20頁(yè)
文件大小： 1135K
代理商： LP2975AIMM-12/NOPB
Reference Designs (Continued)
Load Regulation
Load regulation is 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.
5mA
≤ 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
capacitor. V
IN = 6V and IL = 5A for this test.
NOISE = 75 V (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 s/division). The regulator nominal
output (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
output capacitor chosen for this design. Increasing C
OUT
greatly improves transient response (see Designs #2 and
#3).
10003437
Transient Response for 0–5A Load Step
DESIGN #2: V
OUT =3V @ 0.5A
(Refer to Typical
Application Circuits, Adjustable Voltage Regulator)
Components
C
IN = 68 F Tantalum
C
OUT =2X68F Tantalum
C
C = 470 pF
R1 = 237 k
,1%
R2 = NOT USED
R
SC = 0.1
Tie feedback pin to V
OUT
P-FET = NDT452P
Heatsink: Tab of N-FET is soldered down to 0.6 in
2 copper
area on PC board.
Output Voltage Adjustment: For this application, a 3.3V part
is “trimmed” down to 3V by using a single external 237 k
resistor at R1, which parallels the internal 39.9 k
resistor
(reducing the effective resistance to 34.2 k
).
Because the tempco of the external resistor will not match
the tempco of the internal resistor (which is typically 3000
ppm), this method of adjusting V
OUT by using a single resis-
tor is only recommended in cases where the output voltage
is adjusted
≤ 10% away from the nominal value.
Performance Data
Dropout Voltage
Dropout voltage is defined as the minimum input-to-output
differential voltage required by the regulator to keep the
output in regulation. It is measured by reducing V
IN until the
output voltage drops below the nominal value (the nominal
value is the output voltage measured with V
IN = 5V). IL =
0.5A for this test.
DROPOUT VOLTAGE = 141 mV
Load Regulation
Load regulation is 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 = 3.5V for this test.
0
≤ I
L
≤ 0.5A: LOAD REGULATION = 0.034%
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 = 0.5A for this test.
3.5V
≤ V
IN
≤ 6V: LINE REGULATION = 0.017%
Output Noise Voltage
Output noise voltage was measured by connecting a wide-
band AC voltmeter (HP 400E) directly across the output
capacitor. V
IN = 5V and IL = 0.5A for this test.
NOISE = 85 V (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 = 3.5V for this test.
LP2975
www.national.com
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