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参数资料
| 型号： | Q2D30ZEY-8 |
| 厂商： | POWER-ONE INC |
| 元件分类： | 电源模块 |
| 英文描述： | 2-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件页数： | 13/14页 |
| 文件大小： | 248K |
| 代理商： | Q2D30ZEY-8 |
Q2D Series – Quarter-Brick DC/DC Converter
48V Input
Data Sheet
Dual Output
Rev. NOV 13, 2002
Page 8 of 14
Application
Input and Output Impedance
These power converters have been designed to
be stable with no external capacitors when used
in low inductance input and output circuits.
However, in many applications, the inductance
associated with the distribution from the power
source to the input of the converter can affect the
stability of the converter. The addition of a 33 F
electrolytic capacitor with an ESR < 1
across
the input helps ensure stability of the converter. In
many applications, the user has to use decoupling
capacitance at the load. The converter will exhibit
stable operation with external load capacitance up
to 10,000 F on 3.3 V and 4,700uF on 5 V output.
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power
converter on or off remotely via a system signal.
There are two remote control options available,
positive logic and negative logic and both are
referenced to Vin(-). Typical connections are
shown in Fig. 11.
Rload1
CONTROL
NPUT
Rload2
Vin
Vin (+)
Vin (-)
ON/OFF
Vout2 (+)
TRIM
RTN
Vout1 (+)
QTM Series
Converter
(Top View)
Fig. 11. Circuit Configuration for ON/OFF Function
The positive logic version turns on when the
ON/OFF pin is at logic high and turns off when at
logic low. The converter is on when the ON/OFF
pin is left open
.
The negative logic version turns on when the pin
is at logic low and turns off when the pin is at logic
high. The ON/OFF pin can be hard wired directly
to Vin(-) to enable automatic power up of the
converter without the need of an external control
signal.
A mechanical switch, open collector transistor, or
FET can be used to drive the input of the ON/OFF
pin. The device must be capable of sinking up to
0.2 mA at a low level voltage of
≤ 0.8 V, and
sourcing up to 0.5 mA at high logic level of 5 V;
higher current capability is required for control
voltages greater than 5 V. See the Start-up
Information section for system timing waveforms
associated with use of the ON/OFF pin.
Output Voltage Adjust /TRIM (Pin 6)
The converter’s output voltages can be adjusted
simultaneously up 10% or down 10% relative to
the rated output voltages by the addition of an
externally connected resistor.
The TRIM pin should be left open if trimming is
not being used. To minimize noise pickup, a 0.1
F capacitor is connected internally between the
TRIM and RETURN pins.
Rload1
Rload2
Vin
Vin (+)
Vin (-)
ON/OFF
Vout2 (+)
TRIM
RTN
R T-INCR
Vout1 (+)
QTM Series
Converter
(Top View)
Fig. 12. Configuration for Increasing Output Voltage
To increase the output voltage (refer to Fig. 12), a
trim
resistor,
RT-INCR,
should
be
connected
between the TRIM (Pin 6) and RETURN (Pin 5),
with a value from the tables below.
Rload1
Rload2
Vin
Vin (+)
Vin (-)
ON/OFF
Vout1 (+)
TRIM
RTN
R T-DECR
Vout2 (+)
QTM Series
Converter
(Top View)
Fig. 13A. Configuration for Decreasing Output
Voltage
To decrease the output voltage, a trim resistor RT-
DECR, (Fig. 13A ) should be connected between the
TRIM (Pin 6) and Vout1(+) pin (Pin 4), with a
value from the tables below, where:
?
=
percentage
of
increase
or
decrease
Vout(NOM).
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