參數(shù)資料
型號(hào)： OP184ES
廠商： ANALOG DEVICES INC
元件分類(lèi)： 運(yùn)動(dòng)控制電子
英文描述： Precision Rail-to-Rail Input & Output Operational Amplifiers
中文描述： OP-AMP, 200 uV OFFSET-MAX, 4.25 MHz BAND WIDTH, PDSO8
封裝： MS-012AA, SOIC-8
文件頁(yè)數(shù)： 15/20頁(yè)
文件大?。?/td> 522K
代理商： OP184ES
REV. 0
–15–
OP184/OP284/OP484
10
0%
100
90
1nF LOAD
ONLY
SNUBBER
IN
CIRCUIT
2μs
50mv
50mv
μs
Figure 54. Overshoot and Ringing Is Reduced by Adding a
“Snubber” Network in Parallel with the 1 nF Load
Table I. Snubber Networks for Large Capacitive Loads
Load Capacitance
(C
L
)
Snubber Network
(R
S
, C
S
)
1 nF
10 nF
100 nF
50
, 100 nF
20
, 1
μ
F
5
, 10
μ
F
A Low Dropout Regulator with Current Limiting
Many circuits require stable regulated voltages relatively close,
in potential to an unregulated input source. This “l(fā)ow dropout”
type of regulator is readily implemented with a rail-to-rail out-
put op amp such as the OP284 because the wide output swing
allows easy drive to a low saturation voltage pass device. Fur-
thermore, it is particularly useful when the op amp also enjoys a
rail-rail input feature, as this factor allows it to perform high-
side current sensing for positive rail current limiting. Typical ex-
amples are voltages developed from 3 V to 9 V range system
sources or anywhere where low dropout performance is required
for power efficiency. The 4.5 V case here works from 5 V nomi-
nal sources with worst-case levels down to 4.6 V or less.
Figure 55 shows such a regulator set up using an OP284 plus a
low R
DS(ON)
, P-channel MOSFET pass device. Part of the low
dropout performance of this circuit is provided by Q1, which
has a rating of 0.11
with a gate drive voltage of only 2.7 V.
This relatively low gate drive threshold allows operation of the
regulator on supplies as low as 3 V without compromising over-
all performance.
The circuit’s main voltage control loop operation is provided by
U1B, half of the OP284. This voltage control amplifier ampli-
fies the 2.5 V reference voltage produced by three terminal U2,
a REF192. The regulated output voltage V
OUT
is then:
V
OUT
=
V
OUT
2
1
+
R
2
R
3
(
)
For this example, since V
OUT
of 4.5 V with V
OUT2
= 2.5 V re-
quires a U1B gain of 1.8 times, R3 and R2 are chosen for a ratio
of 1.2:1 or 10.0 k
:8.06 k
(using closest 1% values). Note
that for the lowest V
OUT
dc error, R2
i
R3 should be maintained
equal to R1 (as here), and the R2-R3 resistors should be stable,
close tolerance metal film types. The table in Figure 55 sum-
marizes R1-R3 values for some popular voltages. However,
note that, in general, the output can be anywhere between
V
OUT2
and the 12 V maximum rating of Q1.
While the low voltage saturation characteristic of Q1 is a key
part of the low dropout, another component is a low current
sense comparison threshold with good dc accuracy. Here, this
is provided by current sense amplifier U1A, which is provided
by a 20 mV reference from the 1.235 V AD589 reference diode
D2 and the R7-R8 divider. When the product of the output
current and the R
S
value match this voltage threshold, the cur-
rent control loop is activated, and U1A drives Q1’s gate through
D1. This causes the overall circuit operation to enter current
mode control with a current limit I
LIMIT
defined as:
I
LIMIT
=
V
R
(
D
2)
R
S
R
7
R
7
+
R
8
(
)
R9
27.4k
C4
0.1μF
C5
0.01μF
R11
1k
R6
4.99k
R8
301k
+V
S
R10
1k
R2
8.06k
C3
0.1μF
R
S
0.05
C6
10μF
3
2
1
8
4
R7
4.99k
U1A
OP284
D2
AD589
D1
1N4148
R5
22.1k
Q1
SI9433DY
R4
2.21k
6
5
7
C1
0.01μF
U1B
OP284
D3
1N4148
2
6
4
3
U2
REF192
C2
1μF
R1
4.53k
V
2
2.5V
R3
10k
5.0V
4.5V
3.3V
3.0V
4.99k
4.53k
2.43k
1.69k
10.0k
8.06k
3.24k
2.00k
10.0k
10.0k
10.0k
10.0k
V
OUT
R1
R2
R3
OUTPUT TABLE
V
S
>
V
OUT
+ 0.1V
OPTIONAL
ON/OFF CONTROL INPUT
CMOS HI (OR OPEN) = ON
LO = OFF
V
IN
COMMON
V
V
=
4.5V @ 350mA
(SEE TABLE)
V
OUT
COMMON
Figure 55. A Low Dropout Regulator with Current Limiting
相關(guān)PDF資料
PDF描述
OP184FP Precision Rail-to-Rail Input & Output Operational Amplifiers
OP184FS Precision Rail-to-Rail Input & Output Operational Amplifiers
OP484EP Precision Rail-to-Rail Input & Output Operational Amplifiers
OP484ES Precision Rail-to-Rail Input & Output Operational Amplifiers
OP484FP Precision Rail-to-Rail Input & Output Operational Amplifiers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
OP184ES-REEL 功能描述:IC OPAMP GP R-R 4.25MHZ LN 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱(chēng):OP481GRUZ-REELCT
OP184ES-REEL7 功能描述:IC OPAMP GP R-R 4.25MHZ LN 8SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:滿擺幅 轉(zhuǎn)換速率:0.028 V/µs 增益帶寬積:105kHz -3db帶寬:- 電流 - 輸入偏壓:3nA 電壓 - 輸入偏移:100µV 電流 - 電源:3.3µA 電流 - 輸出 / 通道:12mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:剪切帶 (CT) 其它名稱(chēng):OP481GRUZ-REELCT
OP184ESZ 功能描述:IC OPAMP GP R-R 4.25MHZ LN 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 放大器類(lèi)型:通用 電路數(shù):4 輸出類(lèi)型:- 轉(zhuǎn)換速率:0.6 V/µs 增益帶寬積:1MHz -3db帶寬:- 電流 - 輸入偏壓:45nA 電壓 - 輸入偏移:2000µV 電流 - 電源:1.4mA 電流 - 輸出 / 通道:40mA 電壓 - 電源，單路/雙路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:14-TSSOP（0.173"，4.40mm 寬） 供應(yīng)商設(shè)備封裝:14-TSSOP 包裝:帶卷 (TR) 其它名稱(chēng):LM324ADTBR2G-NDLM324ADTBR2GOSTR
OP184ESZ 制造商:Analog Devices 功能描述:Operational Amplifier (Op-Amp) IC 制造商:Analog Devices 功能描述:IC, OP-AMP, 4.25MHZ, 4V/ us, SOIC-8
OP184ESZ-REEL 功能描述:IC OPAMP GP R-R 4.25MHZ LN 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類(lèi)型:電流檢測(cè) 電路數(shù):1 輸出類(lèi)型:- 轉(zhuǎn)換速率:- 增益帶寬積:125kHz -3db帶寬:- 電流 - 輸入偏壓:- 電壓 - 輸入偏移:100µV 電流 - 電源:1.1µA 電流 - 輸出 / 通道:- 電壓 - 電源，單路/雙路(±):- 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:4-WFBGA，CSPBGA 供應(yīng)商設(shè)備封裝:4-UCSP（2x2） 包裝:剪切帶 (CT) 其它名稱(chēng):MAX9634WERS+TCT
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