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| 型号： | ADP3050-BL1-EVZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVALUATION FOR ADP3050 |
| 标准包装： | 1 |
| 系列： | * |
ADP3050
THEORY OF OPERATION
Data Sheet
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
Figure 1). 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
D1
1N5818
L1
33μH
D2
1N4148
C3
220nF
1 SWITCH
2 BOOST
IN 8
GND 7
3.3V
V OUT
+ C4
100μF
current (summed with the oscillator ramp). When this signal
3 BIAS
SD 6
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.
V IN
12V
+ C1
22μF
4 FB COMP 5
U1
ADP3050-3.3
R1
4k?
C2
1nF
The current sense amplifier provides a signal proportional to
R2 = R1 × ? ? OUT ? 1 ? ?
(1)
switch current to both the comparator and to a cycle-by-cycle
current limit. If the current limit is exceeded, the latch is 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
Figure 24. Typical Application Circuit
SETTING THE OUTPUT VOLTAGE
The output of the adjustable version (ADP3050AR and
ADP3050ARZ) 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
? V ?
? 1 . 2 ?
ADP3050 is drawn from the input supply. When the BIAS pin is
above 2.7 V, the majority of the operating current is drawn from
this pin (usually tied to the low voltage output of the regulator)
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
D1
1N5817
L1
22μH
C3
0.22μF
1 SWITCH
2 BOOST
IN 8
GND 7
+
2.5V
V OUT
C4
2×22μF
CERAMIC
than the output voltage.
The ADP3050 uses a special drive stage allowing the power
C F
R2
21.5k?
3 BIAS
SD 6
+ C1
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 μA.
D2
1N4148
5V
V IN
GND
4 FB COMP 5
R1 R C
20k? U1 7.5k?
ADP3050
C2
2×10μF
0.01μF
CERAMIC
Figure 25. Adjustable Output Application Circuit
C C
4.7nF
Rev. C | Page 10 of 20
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相关代理商/技术参数 |
参数描述 |
|---|---|
| ADP3050-EVAL | 功能描述:BOARD EVAL FOR ADP3050 RoHS:否 类别:编程器，开发系统 >> 评估板 - DC/DC 与 AC/DC（离线）SMPS 系列:- 标准包装:1 系列:- 主要目的:DC/DC，步降 输出及类型:1，非隔离 功率 - 输出:- 输出电压:3.3V 电流 - 输出:3A 输入电压:4.5 V ~ 28 V 稳压器拓扑结构:降压 频率 - 开关:250kHz 板类型:完全填充 已供物品:板 已用 IC / 零件:L7981 其它名称:497-12113STEVAL-ISA094V1-ND |
| ADP3050-EVALZ | 制造商:AD 制造商全称:Analog Devices 功能描述:200 kHz, 1 A High Voltage Step-Down Switching Regulator |
| ADP3051 | 制造商:AD 制造商全称:Analog Devices 功能描述:500 mA PWM Step-Down DC-DC with Synchronous Rectifier |
| ADP3051ARMZ-REEL | 制造商:Analog Devices 功能描述:CONV DC-DC SGL-OUT STEP DOWN 8MSOP - Tape and Reel |
| ADP3051ARMZ-REEL7 | 制造商:Analog Devices 功能描述:Conv DC-DC Single Step Down 2.7V to 5.5V 8-Pin MSOP T/R 制造商:Analog Devices 功能描述:SWITCH REG SYNC BUCK 500MA 8MSOP |
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