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參數(shù)資料
| 型號(hào)： | PQ60010EML15PYS |
| 廠商： | SYNQOR INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 470K |
| 代理商： | PQ60010EML15PYS |
Product # PQ60010EML15
Phone 1-888-567-9596
Doc.# 005-2EM601E Rev. A
12/14/04
Page 9
BASIC OPERATION AND FEATURES
The
PowerQor series converter uses a two-stage power conver-
sion topology. The first stage is a buck-converter that keeps the
output voltage constant over variations in line, load, and tem-
perature. The second stage uses a transformer to provide the
functions of input/output isolation and voltage step-down to
achieve the low output voltage required.
Both the first stage and the second stage switch at a fixed fre-
quency for predictable EMI performance. Rectification of the
transformer’s output is accomplished with synchronous recti-
fiers. These devices, which are MOSFETs with a very low on-
state resistance, dissipate far less energy than Schottky diodes.
This is the primary reason that the
PowerQor converter has such
high efficiency, even at very low output voltages and very high
output currents.
Dissipation throughout the converter is so low that it does not
require a heatsink for operation. Since a heatsink is not
required, the
PowerQor converter does not need a metal base-
plate or potting material to help conduct the dissipated energy
to the heatsink. The
PowerQor converter can thus be built more
simply and reliably using high yield surface mount techniques
on a PCB substrate.
The
PowerQor series of eighth-brick, quarter-brick and half-
brick converters uses the industry standard footprint and pin-out
configuration.
CONTROL FEATURES
REMOTE ON/OFF (Pin 2): The ON/OFF input, Pin 2, per-
mits the user to control when the converter is
on or off. This
input is referenced to the return terminal of the input bus,
Vin(-). There are two versions of the converter that differ by the
sense of the logic used for the ON/OFF input.
In the positive logic version, the ON/OFF input is active high
(meaning that a high turns the converter
on). In the negative
logic version, the ON/OFF signal is active low (meaning that a
low turns the converter
on). Figure A details five possible cir-
cuits for driving the ON/OFF pin. Figure B is a detailed look of
the internal ON/OFF circuitry.
REMOTE SENSE(+) (Pins 7 and 5): The SENSE(+) inputs
correct for voltage drops along the conductors that connect the
converter’s output pins to the load.
Pin 7 should be connected to Vout(+) and Pin 5 should be con-
nected to Vout(-) at the point on the board where regulation is
desired. A remote connection at the load can adjust for a volt-
age drop only as large as that specified in this datasheet, that
is
[Vout(+) - Vout(-)] – [Vsense(+) - Vsense(-)] <
Sense Range % x Vout
Pins 7 and 5 must be connected for proper regulation of the
output voltage. If these connections are not made, the convert-
er will deliver an output voltage that is slightly lower than its
specified value.
Open Collector Enable Circuit
Figure A: Various circuits for driving the ON/OFF pin.
Figure B: Internal ON/OFF pin circuitry
Remote Enable Circuit
Direct Logic Drive
Negative Logic
(Permanently Enabled)
Positive Logic
(Permanently Enabled)
ON/OFF
Vin(_
)
ON/OFF
Vin(_
)
ON/OFF
5V
TTL/
CMOS
Vin(_
)
ON/OFF
Vin(_)
Vin(_
)
TTL
5V
50k
274k
Vin(+)
ON/OFF
Vin(_)
50k
100pF
T
Technical
echnical
S
Specification
pecification
PQ60010EML15
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