- 您现在的位置：买卖IC网 > PDF目录1214 > EVAL-ADUM3471EBZ (Analog Devices Inc)EVALUATION MODULE FOR ADUM3471 PDF资料下载
参数资料
| 型号： | EVAL-ADUM3471EBZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 25/36页 |
| 文件大小： | 0K |
| 描述： | EVALUATION MODULE FOR ADUM3471 |
| 标准包装： | 1 |
| 系列： | iCoupler® |
| 主要目的： | 接口，数字式隔离器 |
| 嵌入式： | 否 |
| 已用 IC / 零件： | ADuM3470，ADuM3471，ADuM3472，ADuM3473，ADuM3474 |
| 主要属性： | 2 个独立的 ADuM347x 电路 |
| 次要属性： | 3.3 V ~ 5.5 V 电源 |
| 已供物品： | 板 |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
Data Sheet
ADuM3470/ADuM3471/ADuM3472/ADuM3473/ADuM3474
APPLICATIONS INFORMATION
The dc-to-dc converter section of the ADuM347x uses a
secondary side controller architecture with isolated pulse-width
modulation (PWM) feedback. V DD1 power is supplied to an oscillat-
V DD1
C IN
T1
D1
D2
L1
47μH
C OUT
47μF
V ISO =
+3.3V
TO +15V
R1
ing circuit that switches current to the primary side of an external
power transformer using internal push-pull switches at the X1
and X2 pins. Power transferred to the secondary side of the trans-
former is full wave rectified with external Schottky diodes (D1
and D2), filtered with the L1 inductor and C OUT capacitor, and
regulated to the isolated power supply voltage from 3.3 V to 15 V.
1 X1
2 GND 1
3 NC
4 X2
5 V IA /V OA
6 V IB /V OB
7 V IC /V OC
ADuM3470/
ADuM3471/
ADuM3472/
ADuM3473/
ADuM3474
20 V REG
19 GND 2
18 V DD2
17 FB
16 V IA /V OA
15 V IB /V OB
14 V IC /V OC
0.1μF
+5V
V FB
R2
R OC 100k?
C OUT1
R1
The secondary (V ISO ) side controller regulates the output using
a feedback voltage, V FB , from a resistor divider on the output to
create a PWM control signal that is sent to the primary (V DD1 ) side
by a dedicated i Coupler data channel labeled V FB . The primary side
PWM converter varies the duty cycle of the X1 and X2 switches
to modulate the oscillator circuit and control the power being
sent to the secondary side. This feedback allows for significantly
higher power and efficiency.
The ADuM347x devices implement undervoltage lockout
(UVLO) with hysteresis on the V DDA power input. This feature
ensures that the converter does not go into oscillation due to
noisy input power or slow power-on ramp rates.
A minimum load current of 10 mA is recommended to ensure
V DD1
0.1μF
V DD1
C IN
8 V ID /V OD 13 V ID /V OD
9 V DDA 12 OC
10 GND 1 11 GND 2
V ISO = V FB × (R1 + R2)/R2
FOR V ISO = 3.3V OR 5V, CONNECT V REG , V DD2 , AND V ISO .
Figure 38. Single Power Supply
D1 L1
T1 V ISO =
+12V TO
47μH 47μF
+24V
UNREGULATED
+6V TO
+12V
D2 L2 C OUT2
47μF
47μH
D3
D4
optimum load regulation. Smaller loads can generate excess noise
on the output due to short or erratic PWM pulses. Excess noise
generated in this way can cause regulation problems in some
circumstances.
APPLICATION SCHEMATICS
The ADuM347x devices have three main application schematics,
as shown in Figure 38 to Figure 40. Figure 38 has a center-tapped
secondary and two Schottky diodes that provide full wave
V DD1
0.1μF
1 X1
2 GND 1
3 NC
4 X2
5 V IA /V OA
6 V IB /V OB
7 V IC /V OC
8 V ID /V OD
9 V DDA
10 GND 1
ADuM3470/
ADuM3471/
ADuM3472/
ADuM3473/
ADuM3474
20 V REG
19 GND 2
18 V DD2
17 FB
16 V IA /V OA
15 V IB /V OB
14 V IC /V OC
13 V ID /V OD
12 OC
11 GND 2
0.1μF
+5V
R OC 100k?
V FB
R2
rectification for a single output, typically for power supplies of
3.3 V, 5 V, 12 V, and 15 V. For single supplies when V ISO = 3.3 V
or 5 V, V REG , V DD2 , and V ISO can be connected together.
V ISO = V FB × (R1 + R2)/R2
FOR V ISO = 15V OR LESS, V REG CAN CONNECT TO V ISO .
Figure 39. Doubling Power Supply
single supply with an output that exceeds 15 V; 15 V is the largest
supply that can be connected to the regulator input, V REG (Pin 20).
In the circuit shown in Figure 39, the output voltage can be as high
as 24 V, and the voltage at the V REG pin can be as high as 12 V.
When using the circuit shown in Figure 39 to obtain an output
voltage lower than 10 V (for example, V DD1 = 3.3 V, V ISO = 5 V),
connect V REG to V ISO directly.
V DD1
C IN
T1
D1
D2
D3
D4
L1
47μH
L2
47μH
47μF
C OUT1
C OUT2
47μF
V ISO =
COARSELY
REGULATED
+5V TO +15V
UNREGULATED
–5V TO –15V
R1
1 X1
20 V REG
ADuM3470/
3 NC
18 V DD2
ADuM3471/
ADuM3472/
ADuM3473/ R2
ADuM3474
R OC 100k?
9 V DDA 12 OC
is an example of a coarsely regulated, positive power supply and
an unregulated, negative power supply for outputs of approxi-
mately ±5 V, ±12 V, and ±15 V.
For all the circuits shown in Figure 38 to Figure 40, the isolated
output voltage (V ISO ) can be set with the voltage dividers, R1
and R2 (values 1 k? to 100 k?) using the following equation:
V ISO = V FB × ( R1 + R2 )/ R2
where V FB is the internal feedback voltage (approximately 1.25 V).
V DD1
2 GND 1 19 GND 2
0.1μF
+5V
4 X2 17 FB
V FB
5 V IA /V OA 16 V IA /V OA
6 V IB /V OB 15 V IB /V OB
7 V IC /V OC 14 V IC /V OC
8 V ID /V OD 13 V ID /V OD
0.1μF 10 GND 1 11 GND 2
V ISO = V FB × (R1 + R2)/R2
Figure 40. Positive Supply and Unregulated Negative Supply
Rev. A | Page 25 of 36
相关PDF资料 |
PDF描述 |
|---|---|
| EVAL-ADUM4160EBZ | EVALUATION MODULE FOR ADUM4160 |
| EVAL-ADUM4223AEBZ | BOARD EVAL FOR ADUM4223 |
| EVAL-ADUMQSEBZ | EVAL BOARD FOR ICOUPLER SMD |
| EVAL-ADUSB2EBUZ | BOARD EVAL USBI |
| EVAL-ADV7195EB | BOARD EVAL FOR ADV7195 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| EVAL-ADUM3481EBZ | 制造商:Analog Devices 功能描述:EVALUATION BOARD DIGITAL ISOLATOR - Boxed Product (Development Kits) |
| EVAL-ADUM4070EBZ | 功能描述:界面开发工具 RoHS:否 制造商:Bourns 产品:Evaluation Boards 类型:RS-485 工具用于评估:ADM3485E 接口类型:RS-485 工作电源电压:3.3 V |
| EVAL-ADUM4160EBZ | 功能描述:EVALUATION MODULE FOR ADUM4160 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:iCoupler® 标准包装:1 系列:- 主要目的:电信，线路接口单元（LIU） 嵌入式:- 已用 IC / 零件:IDT82V2081 主要属性:T1/J1/E1 LIU 次要属性:- 已供物品:板，电源，线缆，CD 其它名称:82EBV2081 |
| EVAL-ADUM4160EBZ RENT | 制造商:Analog Devices 功能描述:BOARD EVAL DIGITAL ISOLATOR |
| EVAL-ADUM4223AEBZ | 功能描述:BOARD EVAL FOR ADUM4223 RoHS:是 类别:编程器，开发系统 >> 评估演示板和套件 系列:iCoupler® 标准包装:1 系列:- 主要目的:数字电位器 嵌入式:- 已用 IC / 零件:AD5258 主要属性:- 次要属性:- 已供物品:板 相关产品:AD5258BRMZ1-ND - IC POT DGTL I2C1K 64P 10MSOPAD5258BRMZ10-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ100-ND - IC POT DGTL I2C 100K 64P 10MSOPAD5258BRMZ50-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ1-R7-ND - IC POT DGTL I2C 1K 64P 10MSOPAD5258BRMZ10-R7-ND - IC POT DGTL I2C 10K 64P 10MSOPAD5258BRMZ50-R7-ND - IC POT DGTL I2C 50K 64P 10MSOPAD5258BRMZ100-R7-ND - IC POT DGTL I2C 100K 64P 10MSOP |
发布紧急采购，3分钟左右您将得到回复。