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參數(shù)資料
| 型號： | UHE-1.2/10000-D24NRL1T |
| 廠商： | CD TECHNOLOGIES INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 12 W DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 10/13頁 |
| 文件大?。?/td> | 425K |
| 代理商： | UHE-1.2/10000-D24NRL1T |
XHE Series
1 2 - 3 0 W , S I N G L E O U T P U T D C / D C C O N V E R T E R S
LOAD
+OUTPUT
–INPUT
+INPUT
ON/OFF
CONTROL
TRIM
+SENSE
–OUTPUT
–SENSE
7
8
2
1
9
6
5
4
20k
5-22
TURNS
LOAD
R1
+OUTPUT
–INPUT
+INPUT
ON/OFF
CONTROL
TRIM
+SENSE
–OUTPUT
–SENSE
7
8
2
1
9
6
5
4
Figure 6.Trim Connections Using A Trimpot
Figure 7.Trim Connections To Decrease Output Voltages Using a Fixed Resistor
(for all models except 1.2V models which will increase VOUT)
6
Short Circuit Condition
When a converter is in current-limit mode, the output voltage will drop as
the output current demand increases. If the output voltage drops too low, the
magnetically coupled voltage used to develop primary side voltages will also
drop, thereby shutting down the PWM controller. Following a time-out period,
the PWM will restart causing the output voltages to begin ramping to their
appropriate values. If the short-circuit condition persists, another shutdown
cycle will be initiated. This on/off cycling is referred to as "hiccup" mode.
The hiccup cycling reduces the average output current, thereby preventing
internal temperatures from rising to excessive levels. The UHE is capable of
enduring an indenite short circuit output condition.
FEATURES AND OPTIONS
On/Off Control
The input-side, remote On/Off Control function (pin 4) can be ordered to
operate with either polarity:
Standard models are equipped with Positive-polarity (no part-number sufx)
and these devices are enabled when pin 4 is left open (or is pulled high,
applying +13V to +VIN with respect to –Input, pin 2) as per Figure 4. Positive-
polarity devices are disabled when pin 4 is pulled low (0 to 0.8V with respect
to –Input).
Optional Negative-polarity devices ("N" sufx) are off when pin 4 is left open
(or pulled high, applying +3.5V to +VIN), and on when pin 4 is pulled low (0 to
0.8V) with respect to –VIN as shown in Figure 5.
4
2
1
+INPUT
13V CIRCUIT
5V CIRCUIT
–INPUT
ON/OFF
CONTROL
4
2
1
+INPUT
+VCC
–INPUT
ON/OFF
CONTROL
Figure 4. Driving the Positive Polarity On/Off Control Pin
Figure 5. Driving the Negative Polarity On/Off Control Pin
Dynamic control of the remote on/off function is best accomplished with a
mechanical relay or an open-collector/open-drain drive circuit (optically iso-
lated if appropriate). The drive circuit should be able to sink appropriate current
(see Performance Specs) when activated and withstand appropriate voltage
when deactivated. Applying an external voltage to pin 4 when no input power
is applied to the converter can cause permanent damage to the converter.
Trimming Output Voltage
UHE converters have a trim capability (pin 9) that allows users to adjust the
output voltages ±5% of VOUT (±10% for T models). Adjustments to the output
voltages can be accomplished via a trim pot (Figure 6) or a single xed
resistor as shown in Figures 7 and 8. A single xed resistor can increase or
decrease the output voltage depending on its connection. The resistor should
be located close to the converter and have a TCR less than 100ppm/°C to
minimize sensitivity to changes in temperature. If the trim function is not
used, leave the trim pin oating.
A single resistor connected from the Trim (pin 9) to the +Output (pin 6), or
+Sense where applicable, will decrease the output voltage for all models with
the exception of the 1.2V models, which will increase the output voltage in
this conguration. A resistor connected from the Trim (pin 9) to the –Output
(pin 7), or –Sense where applicable, will increase the output voltage for all
models with the exception of the 1.2V models, which will decrease the output
voltage in this conguration.
Trim adjustments greater than the specied ±5% can have an adverse affect
on the converter's performance and are not recommended. Excessive voltage
differences between VOUT and Sense, in conjunction with trim adjustment of
the output voltage, can cause the overvoltage protection circuitry to activate
(see Performance Specications for overvoltage limits). Power derating is
based on maximum output current and voltage at the converter's output pins.
Use of trim and sense functions can cause output voltages to increase,
thereby increasing output power beyond the converter's specied rating or
cause output voltages to climb into the output overvoltage region. Therefore:
(VOUT at pins) x (IOUT) <= rated output power
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