参数资料
| 型号： | SQE48T20050-PGB0 |
| 厂商： | Power-One |
| 文件页数： | 5/14页 |
| 文件大小： | 0K |
| 描述： | DC/DC EIGHTH BRICK |
| 标准包装： | 100 |
| 系列： | * |
SQE48T20050 DC-DC Converter Data Sheet
36-75 VDC Input; 5.0 VDC @ 20 A Output
[k Ω ]
R T ? DECR =
? 10.22
When using remote sense, the output voltage at the
converter can be increased by as much as 10%
above the nominal rating in order to maintain the
required voltage across the load. Therefore, the
designer must, if necessary, decrease the maximum
current (originally obtained from the derating curves)
by the same percentage to ensure the converter’s
actual output power remains at or below the
maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 6)
511
Δ
where,
R T ? DECR = Required value of trim-down resistor [k Ω ]
and Δ is defined above.
Note:
The above equations for calculation of trim resistor values
match those typically used in conventional industry-standard
quarter-bricks and one-eighth bricks.
The output voltage can be adjusted up 10% or down
20% relative to the rated output voltage by the
addition of an externally connected resistor.
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
The TRIM pin should be left open if trimming is not
being used. To minimize noise pickup, a 0.1 μF
Vin
ON/OFF
TRIM
SENSE (-)
R T-DECR
Rload
capacitor is connected internally between the TRIM
and SENSE(-) pins.
Vin (-)
Vout (-)
[k Ω ]
R T ? INCR =
? 10.22
To increase the output voltage, refer to Fig. C. A trim
resistor, R T-INCR , should be connected between the
TRIM (Pin 6) and SENSE(+) (Pin 7), with a value of:
5.11(100 + Δ )V O ? NOM ? 626
1.225 Δ
where,
R T ? INCR = Required value of trim-up resistor k Ω ]
V O ? NOM = Nominal value of output voltage [V]
Fig. D: Configuration for decreasing output voltage.
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and
its sense pins does not exceed 10% of V OUT ( NOM ),
or:
Δ =
(V O - REQ ? V O - NOM )
V O - NOM
X 100 [%]
[V OUT ( + ) ? V OUT ( ? )] ? [V SENSE ( + ) ? V SENSE ( ? )] ≤ V O - NOM X 10% [V]
This equation is applicable for any condition of
V O ? REQ = Desired (trimmed) output voltage [V].
output sensing and/or output trim.
Vin (+)
SQE48 Converter
(Top View)
Vout (+)
SENSE (+)
R T-INCR
Protection Features
Input Undervoltage Lockout
Vin
ON/OFF
Vin (-)
TRIM
SENSE (-)
Vout (-)
Rload
Input undervoltage lockout is standard with this
converter. The converter will shut down when the
input voltage drops below a pre-determined voltage.
The input voltage must be typically 34 V for the
Fig. C: Configuration for increasing output voltage.
When trimming up, care must be taken not to exceed
the converter‘s maximum allowable output power.
See the previous section for a complete discussion
of this requirement.
To decrease the output voltage (Fig. D), a trim
resistor, R T-DECR , should be connected between the
TRIM (Pin 6) and SENSE(-) (Pin 5), with a value of:
converter to turn on. Once the converter has been
turned on, it will shut off when the input voltage
drops typically below 32 V. This feature is beneficial
in preventing deep discharging of batteries used in
telecom applications.
Output Overcurrent Protection (OCP)
The converter is protected against overcurrent or
short circuit conditions. Upon sensing an over-
current condition, the converter will switch to
constant current operation and thereby begin to
JUL 07, 2006 revised to APR 12, 2007
Page 5 of 16
www.power-one.com
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