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參數(shù)資料
| 型號： | NCP1086T-ADJG |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 1.5 A Adjustable and 3.3 V Fixed Output Linear Regulator |
| 中文描述： | 1.25 V-5.5 V ADJUSTABLE POSITIVE LDO REGULATOR, 1.4 V DROPOUT, SFM3 |
| 封裝： | LEAD FREE, TO-220, 3 PIN |
| 文件頁數(shù)： | 5/14頁 |
| 文件大小： | 126K |
| 代理商： | NCP1086T-ADJG |
NCP1086
http://onsemi.com
5
T
CASE
= 0
°
C
Figure 11. Ripple Rejection vs. Frequency
(Adjustable Output)
0
Output Current (A)
O
0.100
T
CASE
= 125
°
C
T
CASE
= 25
°
C
1.0
2.0
0.075
0.050
0.025
0
V
IN
V
OUT
(V)
M
4.0
0.60
0.55
0.45
0.40
0.65
0.50
1.0
2.0
3.0
5.0
6.0
7.0
T
CASE
= 25
°
C
T
CASE
= 125
°
C
T
CASE
= 0
°
C
10
1
Frequency (Hz)
R
85
75
65
55
45
35
25
15
10
2
10
3
10
4
10
5
10
6
10
1
Frequency (Hz)
R
85
75
65
55
45
35
25
15
10
2
10
3
10
4
10
5
10
6
Figure 12. Ripple Rejection vs. Frequency
(3.3 V Fixed Output)
Figure 13. Load Regulation vs. Output Current
(Adjustable Output)
Figure 14. Minimum Load Current vs V
IN
V
OUT
(Adjustable Output)
T
CASE
= 25
°
C
I
OUT
= 6A
(V
IN
V
OUT
= 3V)
V
RIPPLE
= 1.6V
PP
C
Adj
= 0.1 F
T
CASE
= 25
°
C
I
OUT
= 6A
(V
IN
V
OUT
= 3V)
V
RIPPLE
= 1.6V
PP
C
IN
= C
OUt
= 22 F Tantalum
APPLICATIONS INFORMATION
The NCP1086 voltage regulator series provides
adjustable and 3.3 V output voltages at currents up to 1.5 A.
The regulator is protected against overcurrent conditions
and includes thermal shutdown.
The NCP1086 series has a composite PNPNPN output
transistor and requires an output capacitor for stability. A
detailed procedure for selecting this capacitor is included in
the Stability Considerations section.
Adjustable Operation
The adjustable output device has an output voltage range
of 1.25 V to 5.5 V. An external resistor divider sets the
output voltage as shown in Figure 15. The regulator
maintains a fixed 1.25 V (typical) reference between the
output pin and the adjust pin.
A resistor divider network R1 and R2 causes a fixed
current to flow to ground. This current creates a voltage
across R2 that adds to the 1.25 V across R1 and sets the
overall output voltage. The adjust pin current (typically
50 A) also flows through R2 and adds a small error that
should be taken into account if precise adjustment of V
OUT
is necessary.
The output voltage is set according to the formula:
VOUT
VREF
R1
R2
R1
IAdj
R2
The term I
Adj
×
R2 represents the error added by the adjust
pin current.
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