IMS30 データシートの表示（PDF） - Power-One Inc.
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IMS30 Datasheet PDF : 11 Pages
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Auxiliary Functions
Shut Down Function
The outputs of the converters may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
shut down pin. If the shut down function is not required then
pin should be left open-circuit.
Converter operating: 2.0...5.0 V
Converter shut down: –1...0.7 V
The shut down pin can also be used as a programmable
undervoltage lockout. The undervoltage lockout values for
the 48 IMS30 series is 31 V with a 0.5V hysteresis window
which can be trimmed up by means of an external resistor
connected between the SD/PUL pin and Vi– pin.
Vi+
SD/PUL
Rext
Vi–
06133
Vo+
Vo–
Fig. 8
Shut down (SD) and undervoltage lockout (PUL) function.
Table 6: Typical values for undervoltage lockout (PUL)
settings.
48 IMS 30
Rext [k ]
50
29
20
15
Ui min [V]
31
34
36
38
40
Synchronisation
The IMS 30 provides a bi-directional synchronisation func-
tion to synchronise several IMS 30 units operated in parallel
connection. When the W pins (SYNC) are connected to-
gether, the converters will lock to the highest switching fre-
quency. The faster controller becomes the master, produc-
ing a 4.3 V, 200 ns pulse train. Only one, the highest fre-
quency SYNC signal, will appear on the Sync line.
Adjustable Output Voltage
As a standard feature, the IMS 30 units offer adjustable
output voltage by using the secondary referenced control
Trim. If the control input is left open-circuit the output volt-
age is set to Uo nom. Adjustment of the output voltage is pos-
sible by means of an external resistor Rext connected be-
tween the Trim pin and the either Vo+ or Vo–.
Fig. 9
Output voltage Trim.
Table 7: Uo versus Uext for Uo = 90...110% Uo nom;
typical values (Ui nom, Io1/2 = 0.5 Io1/2 nom)
Uo nom [V]
Rext 1
Uo [V]
[k]
Rext 2
Uo [V]
[k]
3.3
2.97
8
3.63
5
Thermal Considerations
If a converter, mounted on a PCB, is located in free, quasi-
stationary air (convection cooling) at the indicated maxi-
mum ambient temperature TA max (see table: Temperature
specifications) and is operated at its nominal input voltage
and output power, the case temperature TC measured at the
Measuring point of case temperature TC (see: Mechanical
Data) will approach the indicated value TC max after the
warm-up phase. However, the relationship between TA and
TC depends heavily on the conditions of operation and inte-
gration into a system. The thermal conditions are influenced
by input voltage, output current, airflow, temperature of sur-
rounding components and surfaces and the properties of
the printed circuit board. TA max is therefore only an indica-
tive value and under practical operating conditions, the ad-
missible ambient temperature TA may be higher or lower
than this value.
Caution: The case temperature TC measured at the
Measuring point of case temperature TC (see: Mechani-
cal Data) must under no circumstances exceed the
specified maximum value. The installer must ensure that
under all operating conditions TC remains within the lim-
its stated in the table: Temperature specifications.
Short Circuit Behaviour
The current limit characteristic shuts down the converter
whenever a short circuit or an overload is applied to its out-
put. It acts self-protecting and automatically recovers after
removal of the overload condition (hiccup mode).
Overtemperature Protection
The converters are protected from possible overheating by
means of an internal non latching temperature monitoring
circuit. It shuts down the unit above the internal tempera-
ture limit and attempts to automatically restart in short peri-
ods. This feature prevents excessive internal temperature
excursion which could occur in heavy overload conditions.
Extendable output power characterisation of 48IMS30-0302-9G
under forced air condition
32
30
06134
28
Vi+
Vo+
26
Rext 1
24
Trim
22
Rext 2
20
Vi–
Vo–
0 100 200 300 400 500 600 700 800
Air-Flow (LFM)
6/11
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