參數(shù)資料
型號(hào)： ADUM6404ARWZ
廠商： ANALOG DEVICES INC
元件分類： 模擬信號(hào)調(diào)理
英文描述： SPECIALTY ANALOG CIRCUIT, PDSO16
封裝： ROHS COMPLIANT, MS-013AA, SOIC-16
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 440K
代理商： ADUM6404ARWZ
ADuM6400/ADuM6401/ADuM6402/ADuM6403/ADuM6404
Rev. 0 | Page 19 of 24
APPLICATIONS INFORMATION
THEORY OF OPERATION
The dc-to-dc converter section of the ADuM640x works on
principles that are common to most modern power supplies.
It is a secondary side controller architecture with isolated pulse-
width modulation (PWM) feedback. VDD1 power is supplied to an
oscillating circuit that switches current into a chip-scale air core
transformer. Power transferred to the secondary side is rectified
and regulated to either 3.3 V or 5 V. The secondary (VISO) side
controller regulates the output by creating a PWM control signal
that is sent to the primary (VDD1) side by a dedicated iCoupler
data channel. The PWM modulates the oscillator circuit to control
the power being sent to the secondary side. Feedback allows for
significantly higher power and efficiency.
The ADuM640x implement undervoltage lockout (UVLO) with
hysteresis on the VDD1 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
optimum load regulation. Smaller loads can generate excess noise
on chip due to short or erratic PWM pulses. Excess noise gener-
ated this way can cause data corruption, in some circumstances.
PRINTED CIRCUIT BOARD (PCB) LAYOUT
The ADuM640x digital isolators with 0.5 W isoPower integrated
dc-to-dc converters require no external interface circuitry for
the logic interfaces. Power supply bypassing is required at the
input and output supply pins (see Figure 25). Note that a low
ESR bypass capacitor is required between Pin 1 and Pin 2, as
close to the chip pads as possible.
The power supply section of the ADuM640x uses a 180 MHz
oscillator frequency to efficiently pass power through its chip
scale transformers. In addition, normal operation of the data
section of the iCoupler introduces switching transients on the
power supply pins. Bypass capacitors are required for several
operating frequencies. Noise suppression requires a low
inductance, high frequency capacitor; ripple suppression
and proper regulation require a large value capacitor. These are
most conveniently connected between Pin 1 and Pin 2 for VDD1
and between Pin 15 and Pin 16 for VISO. To suppress noise and
reduce ripple, a parallel combination of at least two capacitors
is required. The recommended capacitor values are 0.1 μF and
10 μF for VDD1. The smaller capacitor must have a low ESR; for
example, use of a ceramic capacitor is advised.
Note that the total lead length between the ends of the low ESR
capacitor and the input power supply pin must not exceed 2 mm.
Installing the bypass capacitor with traces more than 2 mm in
length may result in data corruption. A bypass between Pin 1 and
Pin 8 and between Pin 9 and Pin 16 should also be considered
unless both common ground pins are connected together
close to the package.
VDD1
GND1
VISO
GNDISO
VIA/VOA
VIB/VOB
VIC/VOC
VDDL
VID/VOD
VIA/VOA
VIB/VOB
VIC/VOC
VID/VOD
VSEL
GND1
BYPASS < 2mm
GNDISO
08
14
1-
02
5
Figure 25. Recommended Printed Circuit Board Layout
In applications involving high common-mode transients, ensure
that board coupling across the isolation barrier is minimized.
Furthermore, design the board layout such that any coupling
that does occur equally affects all pins on a given component side.
Failure to ensure this can cause voltage differentials between pins,
exceeding the absolute maximum ratings specified in Table 19,
thereby leading to latch-up and/or permanent damage.
The ADuM640x are power devices that dissipate about 1 W
of power when fully loaded and running at maximum speed.
Because it is not possible to apply a heat sink to an isolation
device, the devices primarily depend on heat dissipation into
the PCB through the GND pins. If the devices are used at high
ambient temperatures, provide a thermal path from the GND
pins to the PCB ground plane. The board layout in Figure 25
shows enlarged pads for Pin 8 and Pin 9. Large diameter vias
should be implemented from the pad to the ground, and power
planes should be used to reduce inductance. Multiple vias in the
thermal pads can significantly reduce temperatures inside the
chip. The dimensions of the expanded pads are left to the
discretion of the designer and the available board space.
THERMAL ANALYSIS
The ADuM640x parts consist of four internal die attached to a
split lead frame with two die attach paddles. For the purposes of
thermal analysis, the die is treated as a thermal unit, with the
highest junction temperature reflected in the θJA from Table 14.
The value of θJA is based on measurements taken with the parts
mounted on a JEDEC standard, 4-layer board with fine width
traces and still air. Under normal operating conditions, the
ADuM640x devices operate at full load across the full temperature
range without derating the output current. However, following
the recommendations in the Printed Circuit Board (PCB) Layout
section decreases thermal resistance to the PCB, allowing
increased thermal margins in high ambient temperatures.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ADUM6404ARWZ 制造商:Analog Devices 功能描述:IC DIGITAL ISOLATOR 100NS WSOIC-16
ADUM6404ARWZ-RL 功能描述:IC ISOLATOR 4CH DCDC CONV 16SOIC RoHS:是 類別:隔離器 >> 數(shù)字隔離器 系列:IsoPower®, iCoupler® 產(chǎn)品培訓(xùn)模塊:IsoLoop® Isolator 標(biāo)準(zhǔn)包裝:50 系列:IsoLoop® 輸入 - 1 側(cè)/2 側(cè):5/0 通道數(shù):5 電源電壓:3 V ~ 5.5 V 電壓 - 隔離:2500Vrms 數(shù)據(jù)速率:110Mbps 傳輸延遲:12ns 輸出類型:CMOS 封裝/外殼:16-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:16-SOIC N 包裝:管件 工作溫度:-40°C ~ 85°C 其它名稱:390-1053-5
ADUM6404CRIZ 功能描述:隔離器接口集成電路 8mm creepage 4-Ch 5kV Dig Iso Int DC/DC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時(shí)間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube
ADUM6404CRIZ-RL 功能描述:隔離器接口集成電路 8mm creepage 4-Ch 5kV Dig Iso Int DC/DC RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 傳播延遲時(shí)間: 電源電壓-最大:5.5 V 電源電壓-最小:3 V 電源電流:3.6 mA 功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:SOIC-8 封裝:Tube
ADUM6404CRWZ 功能描述:IC ISOLATOR 4CH DCDC CONV 16SOIC RoHS:是 類別:隔離器 >> 數(shù)字隔離器 系列:IsoPower®, iCoupler® 標(biāo)準(zhǔn)包裝:66 系列:iCoupler® 輸入 - 1 側(cè)/2 側(cè):2/2 通道數(shù):4 電源電壓:3.3V，5V 電壓 - 隔離:2500Vrms 數(shù)據(jù)速率:25Mbps 傳輸延遲:60ns 輸出類型:邏輯 封裝/外殼:20-SSOP（0.209"，5.30mm 寬） 供應(yīng)商設(shè)備封裝:20-SSOP 包裝:管件 工作溫度:-40°C ~ 105°C
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