LS4899-7B1 데이터 시트보기 (PDF) - Power-One Inc.

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LS4899-7B1

100 Watt AC-DC Converters with PFC

Power-One Inc. 

Cassette Style

100 Watt AC-DC Converters

S Series PFC

Auxiliary Functions

i Inhibit for Remote On and Off

Note: With open i input: Output is disabled (Uo = off).

The outputs of the module may be enabled or disabled by

means of a logic signal (TTL, CMOS, etc.) applied between

the inhibit input i and the negative pin of output 1 (Vo1–). In

systems with several units, this feature can be used, for ex-

ample, to control the activation sequence of the converters.

If the inhibit function is not required, connect the inhibit pin

18 to pin 14 to enable the outputs (active low logic, fail

safe). For output response refer to: Hold-up Time and Out-

put Response.

06031

Vi+

Vo+

I inh

i

U inh

Vi–

Vo–

Fig. 17

Definition of Uinh and Iinh.

Iinh [mA]

2.0

Uinh = 0.8 V

Uinh = 2.4 V

1.6

1.2

0.8

0.4

Uo = on

Uo = off

0

–0.4

–0.8

–50 –30 –10 0 10

30

50 Uinh [V]

Fig. 18

Typical inhibit current Iinh versus inhibit voltage Uinh

Sense Lines

(Only for single output units 5.1 V, 12 V, 15 V, 24 V)

This feature enables for compensation of voltage drops

across the connector contacts and if necessary, across the

load lines. If the sense lines are connected at the load

rather than directly at the connector, the user should ensure

that Uo max (between Vo1+ and Vo1–) is not exceeded. We

recommend connecting the sense lines directly at the fe-

male connector.

For further information, please refer to: Application Notes .

To ensure correct operation, both sense lines (S+ and S–)

should be connected to their respective power outputs

(Vo1+ and Vo1–) and the voltage difference between any

sense line and its respective power output pin (as meas-

ured on the connector) should not exceed the following val-

ues:

Table 6: Maximum Voltage compensation allowed using

sense lines

Output

voltage

5.1 V

12 V, 15 V

Total voltage difference Voltage difference

between sense lines and

between

their respective outputs

Vo– and S–

<0.5 V

<0.25 V

<1.0 V

<0.25 V

If the output voltages are increased above Uo nom via R-in-

put control, option P setting, remote sensing or option T, the

output currents must be reduced accordingly so that

Po nom is not exceeded.

Important: The output terminals Vo1+ and Vo1– must

always be connected to the load before connecting the

sense lines S+ and S–, otherwise the unit will be dam-

aged.

Table 5: Inhibit characteristics

Characteristic

Conditions min typ max Unit

Uinh Inhibit Uo = on Ui min…Ui max –50

voltage Uo = off

2.4

0.8 V

50

Iinh Inhibit current Uinh = 0

–400 µA

tr Rise time

30

ms

tf Fall time

depending on Io

Uo/Uo nom

1

06001

0.1

0

tr

t

tf

Inhibit

1

0

t

Fig. 19

Output response as a function of inhibit control

Edition 01/01.2001

11/27

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