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參數資料
| 型號： | ADP3050 |
| 廠商： | Analog Devices, Inc. |
| 英文描述： | 200 kHz, 1 A High-Voltage Step-Down Switching Regulator |
| 中文描述： | 200千赫，1高電壓降壓型開關穩壓器 |
| 文件頁數： | 7/16頁 |
| 文件大小： | 191K |
| 代理商： | ADP3050 |
ADP3050
–
7
–
REV. 0
TIME
–
100 s/DIV
V
IN
= 10V
V
OUT
= 5V
R
LOAD
= 19
L = 33 H COILTRONICS
UP2B-330
C
IN
= 22 F
C
OUT
= 100 F
V
OUT
= 1V/DIV
I
L
= 500mA/DIV
0V
0A
Figure 19. Start-Up from Shutdown
TEMPERATURE
–
C
V
IN
= 10V, NO LOAD
1,150
1,000
45
85
35
T
–
25
15
5
5
15
25
35
45
55
65
75
1,450
1,200
1,100
1,050
1,350
1,250
1,400
1,300
1,500
Figure 20. Error Amplifier Transconductance vs. Temperature
THEORY OF OPERATION
The ADP3050 is a fixed-frequency, current-mode buck regulator.
Current mode systems provide excellent transient response, and
are much easier to compensate than voltage-mode systems. (Refer
to the functional block diagram.) At the beginning of each clock
cycle, the oscillator sets the latch, turning on the power switch.
The signal at the noninverting input of the comparator is a replica
of the switch current (summed with the oscillator ramp). When
this signal reaches the appropriate level set by the output of the
error amplifier, the comparator resets the latch and turns off the
power switch. In this manner, the error amplifier sets the correct
current trip level to keep the output in regulation. If the error
amplifier output increases, more current is delivered to the
output; if it decreases, less current is delivered to the output.
The current sense amplifier provides a signal proportional to
switch current to both the comparator and to a cycle-by-cycle
current limit. If the current limit is exceeded, the latch will be
reset, turning the switch off until the beginning of the next clock
cycle. The ADP3050 has a foldback current limit that reduces
the switching frequency under fault conditions to reduce stress
to the IC and to the external components.
Most of the control circuitry is biased from the 2.5 V internal
regulator. When the BIAS pin is left open, or when the voltage
at this pin is less than 2.7 V, all of the operating current for the
ADP3050 is drawn from the input supply. When the BIAS pin
is above 2.7 V, the majority of the operating current is then
drawn from this pin (usually tied to the regulator's low-voltage
output) instead of from the higher-voltage input supply. This
can provide substantial efficiency improvements at light-load
conditions, especially for systems where the input voltage is
much higher than the output voltage.
The ADP3050 uses a special drive stage that allows the power
switch to saturate. An external diode and capacitor provide a
boosted voltage to the drive stage that is higher than the input
supply voltage. Overall efficiency is dramatically improved by
using this type of saturating drive stage.
Pulling the
SD
pin below 0.4 V puts the device in a low-power
mode, shutting off all internal circuitry and reducing the supply
current to under 20
μ
A.
U1
ADP3050-3.3
V
IN
1
2
3
4
SWITCH
BOOST
BIAS
FB
IN
GND
SD
COMP
8
7
6
5
C3
220nF
D1
1N5818
12V
C1
22 F
+
L1
33 H
V
OUT
3.3V
R1
4k
C2
1nF
+C4
100 F
D2
1N914
Figure 22. Typical Application Circuit
Setting the Output Voltage
The output of the adjustable version (ADP3050AR) can be set
to any voltage between 1.25 V and 12 V by connecting a resistor
divider to the FB pin as shown in Figure 23.
R
R
V
OUT
1 2
2
1
1
=
×
.
(1)
FREQUENCY
–
Hz
0
1M
100
M
–
1k
10k
100k
57.6
48.0
38.4
28.8
19.2
9.6
0
28.8
19.2
9.6
38.4
220
200
180
160
140
120
100
40
60
80
20
P
–
NO LOAD
Figure 21. Error Amplifier Gain
相關PDF資料 |
PDF描述 |
|---|---|
| ADP3050AR | 200 kHz, 1 A High-Voltage Step-Down Switching Regulator |
| ADP3155 | 5-Bit Programmable Triple Power Supply Controller for Pentium III Processors |
| ADP3155JRU | 5-Bit Programmable Triple Power Supply Controller for Pentium III Processors |
| ADP3156JR-15 | Dual Power Supply Controller for Desktop Systems |
| ADP3156JR-18 | Dual Power Supply Controller for Desktop Systems |
相關代理商/技術參數 |
參數描述 |
|---|---|
| ADP3050AR | 制造商:Analog Devices 功能描述:Conv DC-DC Single Step Down 3.6V to 30V 8-Pin SOIC N 制造商:Rochester Electronics LLC 功能描述:HIGH VOLTAGE STEP DOWN SWITCHING REG. - Bulk 制造商:Analog Devices 功能描述:IC SWITCHING REGULATOR |
| ADP3050AR3.3 | 制造商:Analog Devices 功能描述:IC ((NS)) |
| ADP3050AR-3.3 | 功能描述:IC REG BUCK 3.3V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 設計資源:Design Support Tool 標準包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數:1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關:- 電流 - 輸出:100mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應商設備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| ADP3050AR-3.3-REEL | 制造商:Analog Devices 功能描述:Conv DC-DC Single Step Down 3.6V to 30V 8-Pin SOIC N T/R |
| ADP3050AR-3.3-RL7 | 功能描述:IC REG BUCK 3.3V 1A 8SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩壓器 - DC DC 開關穩壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數:1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
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