Datasheet > AFL12007SW

AFL12007SW

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
英飞凌 - INFINEON		转换器
页数	文件大小	规格书
12页	216K
描述
HYBRID-HIGH RELIABILITY DC/DC CONVERTER

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AFL12007SW 数据手册

AFL28XXS Series

Table 1. Nominal Resistance of Cu Wire

Another potential problem resulting from parasitically

induced voltage drop on the input lines is with regard to

the operation of the enable 1 port. The minimum and

maximum operating levels required to operate this port

are specified with respect to the input common return line

at the converter. If a logic signal is generated with respect

to a ‘common’ that is distant from the converter, the effects

of the voltage drop over the return line must be considered

when establishing the worst case TTL switching levels.

These drops will effectively impart a shift to the logic levels.

In Figure VI, it can be seen that referred to system ground,

Wire Size, AWG

Resistance per ft

24 Ga

22 Ga

20 Ga

18 Ga

16 Ga

14 Ga

12 Ga

25.7 mΩ

16.2 mΩ

10.1 m

Ω

6.4 mΩ

4.0 mΩ

2.5 m

Ω

the voltage on the input return pin is given by

1.6 mΩ

As an example of the effects of parasitic resistance,

consider an AFL2815S operating at full power of 120W.

From the specification sheet, this device has a minimum

efficiency of 83% which represents an input power of more

than 145W. If we consider the case where line voltage is at

its’ minimum of 16V, the steady state input current necessary

for this example will be slightly greater than 9 amperes. If

this device were connected to a voltage source with 10

feet of 20 gauge wire, the round trip (input and return)

would result in 0.2Ω of resistance and 1.8V of drop from the

source to the converter. To assure 16V at the input, a

source closer to 18V would be required. In applications

using the paralleling option, this drop will be multiplied by

the number of paralleled devices. By choosing 14 or 16

gauge wire in this example, the parasitic resistance and

resulting voltage drop will be reduced to 25% or 31% of that

e_Rtn= I_Rtn• R_P

Therefore, the logic signal level generated in the system

must be capable of a TTL logic high plus sufficient additional

amplitude to overcome e_Rtn. When the converter is inhibited,

I_Rtndiminishes to near zero and e_Rtnwill then be at system

ground.

Incorporation of a 100µF capacitor at the input terminals is

recommended as compensation for the dynamic effects

of the parasitic resistance of the input cable reacting with

the complex impedance of the converter input, and to

provide an energy reservoir for transient input current

requirements.

with 20 gauge wire.

Figure VI. Problems of Parasitic Resistance in input Leads

(See text)

R_p

I_in

Vin

100

µfd

e_source

Rtn

e_Rtn

I_Rtn

Case

Enable 1

Sync Out

Sync In

System Ground

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