SW003A0A94(2008) Просмотр технического описания (PDF) - Unspecified

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SW003A0A94
(Rev.:2008)

SW/SC001/003 Series DC-DC Converter Power Modules: 18-36V & 36-75Vdc Input; 3.3V-15Vdc Output; 1-3.5A Output Current

Unspecified 

Data Sheet

SW/SC001/003 Series DC-DC Power Module:

December 12, 2008 18-36Vdc & 36-75Vdc Input; 3.3-15Vdc Output; 1-3.5A Output Current

Feature Descriptions (continued)

Trim Up – Increase Output Voltage

By connecting an external resistor between the TRIM pin

and Vout- pin (Radj-up), the output voltage set point

increases (see figure 48). The following equation

determines the external resistor value to obtain an

output voltage change from Vo, nom to the desired Vo,

adj:

Trim Examples

For SW003A0A, nominal 5.0V module. To trim module

down to 4.90V:

Radj

−

down

=

⎡

⎢⎣

(4.9 − 2.5) × 5110

(5.0 − 4.9)

−

2050⎥⎦⎤Ω

Radj − down = 120,590 Ω

Radj

−

up

=

⎡

⎢⎣ (Vo,

G×L

adj − L −

K

)

−

H

⎥⎦⎤Ω

Note: Values for G, H, L and K are defined for each

module version in the following table 1.

Vin+

Vout+

ON/OFF

TRIM

Vin-

Vout-

Radj-up

RLOAD

Figure 48. Circuit Configuration to Increase Output

Voltage.

Table 1. Trim Constants SW series

Module

G

H

K

L

Sx001A0C 10,000 5110 12.5 2.5

Sx001A2B 10,000 5110

9.5

2.5

Sx003A0A 5110 2050

2.5

2.5

Sx003A5F 5110 2050

0.8

2.5

The combination of the output voltage adjustment and

the output voltage initial tolerance must not exceed the

allowable trim range of 90% to 110% of the nominal

output voltage as measured between the Vout+ and

Vout- pins.

The SW/SC power modules have a fixed current-limit set

point. Therefore, as the output voltage is adjusted down,

the available output power is reduced.

LINEAGE POWER

15

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