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| 型号： | ADUM5240ARZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/16页 |
| 文件大小： | 0K |
| 描述： | IC ISOLATOR 2CH W/CONV 8-SOIC |
| 其它图纸： | ADUM5240 Series Diagram |
| 标准包装： | 98 |
| 系列： | IsoPower®, iCoupler® |
| 输入 - 1 侧/2 侧： | 2/0 |
| 通道数： | 2 |
| 电源电压： | 3.35V，4.1V，5V |
| 电压 - 隔离： | 2500Vrms |
| 数据速率： | 1Mbps |
| 传输延迟： | 70ns |
| 输出类型： | 逻辑 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
| 工作温度： | -40°C ~ 105°C |
| 产品目录页面： | 2766 (CN2011-ZH PDF) |
Data Sheet
APPLICATIONS INFORMATION
DC-TO-DC CONVERTER
The dc-to-dc converter section of the ADuM524x works on
principles that are common to most modern power supply
designs. V DD power is supplied to an oscillating circuit that
switches current into a chip scale air core transformer. Power is
ADuM5240/ADuM5241/ADuM5242
PROPAGATION DELAY-RELATED PARAMETERS
Propagation delay is a parameter that describes the time it takes
a logic signal to propagate through a component. The propagation
delay to a logic low output may differ from the propagation
delay to a logic high.
transferred to the secondary side where it is rectified to a high
dc voltage. The power is then linearly regulated down to about
5.2 V and supplied to the secondary side data section and to the
V ISO pin for external use. This design allows for a physically
small power section compatible with the 8-lead SOIC packaging
INPUT (V Ix )
OUTPUT (V Ox )
t PLH
t PHL
50%
50%
of this device. Active feedback was not implemented in this
version of iso Power for reasons of size and cost.
Because the oscillator runs at a constant high frequency inde-
pendent of the load, excess power is internally dissipated in the
output voltage regulation process. Limited space for transformer
coils and components also adds to internal power dissipation.
This results in low power conversion efficiency, especially at low
load currents.
The load characteristic curve in Figure 8 shows that the V DD
current is typically 80 mA with no V ISO load and 110 mA at full
V ISO load at the V DD supply pin.
Alternate supply architectures are possible using this technology.
Addition of a digital feedback path allows regulation of power
on the primary side. Feedback would allow significantly higher
power, efficiency, and synchronization of multiple supplies at the
expense of size and cost. Future implementations of iso Power
includes feedback to achieve these performance improvements.
The ADuM524x can be operated with the internal dc-to-dc
enabled or disabled. With the internal dc-to-dc converter
enabled, the isolated supply of Pin 8 provides the output power
as well as power to the secondary-side circuitry of the part.
The internal dc-to-dc converter state of the ADuM524x is
controlled by the input V DD voltage, as defined in Table 6. In
normal operating mode, V DD is set between 4.5 V and 5.5 V and
the internal dc-to-dc converter is enabled. When/if it is desired
to disable the dc-to-dc converter, V DD is lowered to a value
between 2.7 V and 4.0 V. In this mode, V ISO power is supplied
externally by the user and the signal channels of the ADuM524x
continue to operate normally.
There is hysteresis into the V DD input voltage detect circuit.
Once the dc-to-dc converter is active, the input voltage must be
decreased below the turn-on threshold to disable the converter.
This feature ensures that the converter does not go into
oscillation due to noisy input power.
Figure 12. Propagation Delay Parameters
Pulse width distortion is the maximum difference between
these two propagation delay values and is an indication of how
accurately the timing of the input signal is preserved.
Channel-to-channel matching refers to the maximum amount
the propagation delay differs between channels within a single
ADuM524x component.
Propagation delay skew refers to the maximum amount the
propagation delay differs between multiple ADuM524x
components operating under the same conditions.
DC CORRECTNESS AND MAGNETIC FIELD
IMMUNITY
Positive and negative logic transitions at the isolator input cause
narrow (~1 ns) pulses to be sent to the decoder via the transformer.
The decoder is bistable and is, therefore, either set or reset by
the pulses, indicating input logic transitions. In the absence of
logic transitions at the input for more than 1 μs, a periodic set
of refresh pulses indicative of the correct input state are sent to
ensure dc correctness at the output. If the decoder receives no
internal pulses of more than about 5 μs, the input side is assumed
to be unpowered or nonfunctional, in which case the isolator
output is forced to a default state by the watchdog timer circuit
(see Table 12 through Table 14).
The limitation on the magnetic field immunity of the ADuM524x
is set by the condition in which induced voltage in the receiving
coil of the transformer is sufficiently large to either falsely set or
reset the decoder. The following analysis defines the conditions
under which this may occur. The 3 V operating condition of the
ADuM524x is examined because it represents the most susceptible
mode of operation.
The pulses at the transformer output have an amplitude greater
than 1.0 V. The decoder has a sensing threshold at about 0.5 V, thus
establishing a 0.5 V margin in which induced voltages can be
tolerated. The voltage induced across the receiving coil is given by
V = ( ?dβ/dt )Σπ r n2 ; n = 1, 2, … , N
where:
β is magnetic flux density (gauss).
N is the number of turns in the receiving coil.
r n is the radius of the n th turn in the receiving coil (cm).
Rev. B | Page 11 of 16
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| ADUM5240ARZ-RL7 | 功能描述:IC ISOLATOR 2CH W/CONV 8-SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:IsoPower®, iCoupler® 产品培训模块:IsoLoop® Isolator 标准包装:50 系列:IsoLoop® 输入 - 1 侧/2 侧:5/0 通道数:5 电源电压:3 V ~ 5.5 V 电压 - 隔离:2500Vrms 数据速率:110Mbps 传输延迟:12ns 输出类型:CMOS 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 供应商设备封装:16-SOIC N 包装:管件 工作温度:-40°C ~ 85°C 其它名称:390-1053-5 |
| ADUM5240BRZ | 制造商:Analog Devices 功能描述:DGTL ISOLATORS 8SOIC - Rail/Tube |
| ADUM5240XRZ | 制造商:Analog Devices 功能描述:DUAL-CHANNEL ISOLATORS WITH INTEGRATED DC/DC CONVERTER - Rail/Tube |
| ADUM5241 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual-Channel Isolators with Integrated DC/DC Converter, 50 mW |
| ADUM5241ARZ | 功能描述:IC ISOLATOR 2CH W/CONV 8-SOIC RoHS:是 类别:隔离器 >> 数字隔离器 系列:IsoPower®, iCoupler® 标准包装:66 系列:iCoupler® 输入 - 1 侧/2 侧:2/2 通道数:4 电源电压:3.3V，5V 电压 - 隔离:2500Vrms 数据速率:25Mbps 传输延迟:60ns 输出类型:逻辑 封装/外壳:20-SSOP（0.209"，5.30mm 宽） 供应商设备封装:20-SSOP 包装:管件 工作温度:-40°C ~ 105°C |
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