- 您现在的位置：买卖IC网 > PDF目录17425 > ADP3050-EVAL (Analog Devices Inc)BOARD EVAL FOR ADP3050 PDF资料下载
参数资料
| 型号： | ADP3050-EVAL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 19/20页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR ADP3050 |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输入电压： | 3.6 ~ 30 V |
| 稳压器拓扑结构： | 降压 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | ADP3050 |
| 相关产品： | ADP3050ARZ-3.3-RL7TR-ND - IC REG BUCK 3.3V 1A 8SOIC ADP3050ARZ-3.3-RLTR-ND - IC REG BUCK 3.3V 1A 8SOIC ADP3050ARZ-3.3-ND - IC REG BUCK 3.3V 1A 8SOIC ADP3050ARZ-R7DKR-ND - IC REG BUCK ADJ 1A 8SOIC ADP3050ARZ-R7CT-ND - IC REG BUCK ADJ 1A 8SOIC ADP3050ARZ-R7TR-ND - IC REG BUCK ADJ 1A 8SOIC ADP3050ARZ-5-ND - IC REG BUCK 5V 1A 8SOIC ADP3050ARZ-RLTR-ND - IC REG BUCK ADJ 1A 8SOIC ADP3050ARZ-5-REEL7TR-ND - IC REG BUCK 5V 1A 8SOIC ADP3050ARZ-5-REELTR-ND - IC REG BUCK 5V 1A 8SOIC 更多... |
Data Sheet
Dual Output SEPIC Regulator
For many systems, a dual polarity supply is needed. The circuit
in Figure 30 generates both a positive and a negative 5 V output
using a single magnetic component. The two inductors shown
are actually two separate windings on a single core contained in a
small, surface-mount package. The windings can be connected in
parallel or in series to be used as a single inductor for a conven-
tional buck regulator, or they can be used as a 1:1 transformer,
as in this application. The first winding is used as the standard
buck inductor for the +5 V output. The second winding is used
to generate the ?5 V output along with D2, C6, and C7.
ADP3050
connected to produce the ?5 V supply. The ?5 V output is
generated even without C6 in the circuit, but its inclusion
greatly improves the regulation of the negative output and
lowers the inductor ripple current. The total output current
available for both supplies is limited by the ADP3050 (internally
limited to around 1.0 A).
Keeping load currents below 500 mA and 250 mA, for the
positive and negative supplies, respectively, ensures that the
current limit is not reached under normal operation. These
limits are not interchangeable; 500 mA cannot be drawn from
the ?5 V supply while drawing only 250 mA from the +5 V
D1
1N5818
C3
L1*
25μH
D3
1N4148
L1*
25μH
+
C6 D2
100μF 1N5818
1 SWITCH IN 8
+ C7
100μF
–5V AT 0.25A
V OUT
+5V AT 0.5A
V OUT
+ C5
100μF
supply. The maximum current available from the ?5 V output is
directly related to the +5 V load current, due to the fact that the
+5 V output is used to regulate both supplies. Typically, the ?5 V
load current should be around one-half of the +5 V load current
to ensure good regulation of both outputs. Additionally, the ?5 V
output should have a preload (the minimum current level) of
1% to 2% of the +5 V load current. This helps maintain good
regulation of the ?5 V output at light loads.
0.22μF
2 BOOST
3 BIAS
GND 7
SD 6
The ripple voltage of the +5 V output is that of a normal buck
regulator as described in the Applications Information section.
This ripple voltage is determined by the inductor ripple current
*INDUCTOR IS A SINGLE CORE
WITH TWO WINDINGS
COILTRONICS CTX25-4
SD
12V
V IN
+ C1
22μF
GND
4 FB COMP 5
U1
ADP3050-5
C2
0.01μF
R1
5.1k?
C4
1nF
and the ESR of the output capacitor. For Figure 30, the positive
output voltage ripple is a 30 mV peak-to-peak triangular wave.
The ripple voltage of the ?5 V output is a rectangular wave, due
to the rectangular shape of the current waveform into the ?5 V
output capacitor. The amplitude of this current waveform is
approximately equal to twice the ?5 V load current. For a load
current of 200 mA and an ESR of 100 mΩ, the negative output
voltage ripple is approximately 2 × 200 mA × 100 mΩ, or about
Figure 30. Dual Output +5 V and ?5 V Regulator
These components form a single-ended primary inductance
converter (SEPIC) using the 1:1 coupled inductor to generate
the negative supply. When the switch is off, the voltage across
the buck winding is equal to V O + V D (V D is the diode drop).
This voltage is generated across the second winding, which is
40 mV. The edges of this ripple waveform are quite fast. Along
with the inductance of the output capacitor, it generates narrow
spikes on the negative output voltage. These spikes can easily be
filtered out using an additional 5 μF to 10 μF bypass capacitor
close to the load (the inductance of the PCB trace and the
additional capacitor create a low-pass filter to remove these
high frequency spikes).
Rev. C | Page 19 of 20
相关PDF资料 |
PDF描述 |
|---|---|
| CT8BK40-M | 8" BLACK 40LB CABLE TIE |
| RLF12560T-100M7R5 | INDUCTOR PWR 10UH 20% 12560 SMD |
| M7KKK-3610J | IDC CABLE - MDG36K/MC37G/MDG36K |
| A9CAA-0606E | FLEX CABLE - AFK06A/AE06/AFH06T |
| ISL21007BFB825Z-TK | IC VREF SERIES PREC 2.5V 8-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| ADP3088 | 制造商:AD 制造商全称:Analog Devices 功能描述:1 MHz, 750 mA Buck Regulator |
发布紧急采购，3分钟左右您将得到回复。