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參數(shù)資料
| 型號： | DHC2815S |
| 廠商： | APEX MICROTECHNOLOGY CORP |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT 5 W DC-DC REG PWR SUPPLY MODULE |
| 封裝： | 1 X 1 INCH, 0.350 INCH HEIGHT, HERMETIC SEALED, DIP-8 |
| 文件頁數(shù)： | 5/5頁 |
| 文件大?。?/td> | 156K |
| 代理商： | DHC2815S |
APEX MICROTECHNOLOGY CORPORATION TELEPHONE (520) 690-8600 FAX (520) 888-3329 ORDERS (520) 690-8601 EMAIL prodlit@apexmicrotech.com
51
B
OUTPUT ADJUST / COMP
The output voltage of the DHC2812S and DHC2815S may
be adjusted from 90% to 110% of nominal value by the use of
a 150k( potentiometer as shown. Adjustment beyond this
range is possible, however certain characteristics of the con-
verter such as but not limited to input voltage range, efficiency,
ripple and temperature performance will change. Character-
ization by the user is recommended in such applications.
Adjust/comp (pin 4) may be driven by external circuitry
referenced to pin 2 (-output) if desired. Grounding pin 4 causes
voltage to increase (25% typically) while driving pin 4 above
1.3 V causes output voltage to decrease. Pin 4 may be driven
negative without damage, however the resultant increase in
converter output voltage should be considered. Pin 4 may be
driven through 10K( or more if connection of the comp function
is also required.
The comp function of pin 4 allows load transient response to
be tailored to suit specific application requirements. This
feature may be utilized by connecting a 10 or less nF capacitor
between pins 4 and 1.
Note: The DHC2812S and DHC2815S use pin 4 while the
DHC2803S and DHC2805S use pin 3.
SHUTDOWN PLUS
Pin 5 is used for remote shutdown, output fault detection,
and/or setting the input voltage point at which the converter will
turn on as shown in the typical application diagram. No
connection to pin 5 is necessary for normal operation of the
converter. Pin 5 is referenced to pin 7 (-input).
Shutdown may be implemented by simply connecting pin 5
to an open collector logic output or switch rated at 2.5 mA, 25
Vdc or higher.
Input voltage turn on point is programmed with a single
resistor from pin 5 to 7. An input turn on/off hysteresis (typically
3.5% of Vin) will be observed. This should be considered when
making or verifying set point adjustment. The value of the
setpoint resistor may be determined by the following:
R =
210 * 10
3
E
TO – 9.5
(+/– 10% accuracy at 25
O
C)
Set point temperature coefficient is typically + 400ppm/
O
C
Output fault monitoring is accomplished by observing pin 5
with a high impedance monitoring circuit. Pin 5 voltage drops
4
1
2
150K
10nF
from over 10 V to below 1 V when a load fault causes the
converters fault protection circuitry to activate. It will remain
low for at least 100 mS and return high. If the load fault is still
present pin 5 will return low and the cycle will repeat. A resistor
> 400 k( from pin 5 to 7 provides pull down for pin 5 if there is
no input setpoint programming resistor already in place.
LOAD FAULT RESPONSE
The Apex families of DC-DC converters share load fault
philosophies. Load fault conditions include short-circuit and
severe overload conditions. The DHC2800 converter series
responds to load faults by turning off all power conversion
circuits for 250 mS and then attempting to restart for 10 mS
(typical). The net "on" duty factor during a fault is very low
resulting in low converter dissipation and immunity from over-
heating at 125
°C. Current beyond rated can flow into the load
at startup time. This allows the converter to bring up capacitive
and other difficult load types more reliably than competing
converters.
Vo
NORMAL
TIME
NORMAL
LOAD FAULT
O
Io
O
This data sheet has been carefully checked and is believed to be reliable, however, no responsibility is assumed for possible inaccuracies or omissions. All specifications are subject to change without notice.
DHC2812S/DHC2815SU REV. B JUNE 1999 Apex Microtechnology Corp.
TYPICAL PERFORMANCE
GRAPHS
DHC2812S DHC2815S
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