EQ2660-9R Datasheet, PDF (16/26 Pages) Power-One – Q Series Data Sheet 66 – 132 Watt DC-DC Converters

Q Series Data Sheet
®
66 – 132 Watt DC-DC Converters
Auxiliary Functions
Inhibit for Remote On/Off
Note: If this function is not used, the inhibit pin 28 must be
connected with pin 32 to enable the output(s). A non-
connected pin 28 will be interpreted by the internal logic as an
active inhibit signal and the output(s) will remain disabled (fail
safe function).
An inhibit input enables (logic low, pull down) or disables (logic
high, pull up) the output, if a logic signal, e.g. TTL, CMOS is
applied. In systems consisting of several converters, this
feature may be used, for example, to control the activation
sequence of the converters by means of logic signals, or to
allow the power source for a proper start-up, before full load is
applied.
I_inh
28 i
V_inh
I_{i 30 Vi+}
V_i
32 Vi–
06091a
S+ 12
I_o
Vo+ 4
Vo+ 6
V_o
Vo– 8
Vo– 10
S– 14
26
Fig. 18
Definition of input and output parameters
Table 7: Inhibit characteristics
Characteristics
Conditions min typ max Unit
V_inh Inhibit V_o = on V_{i min} – V_{i max} – 50
voltage _{Vo = off} T_{C min} – T_{C max 2.4}
0.8 VDC
50
I_inh Inhibit current
V_inh = – 50 V
V_inh = 0 V
V_inh = 50 V
– 500
µA
– 40
+500
The output response, when enabling and disabling the output
by the inhibit input, is shown in the following figure.
V_o/V_{o nom}
t_r
1.01
0.99
0.1
0
V_i
V_{i min}
0
t_{d on}
V_inh [V]
2.4
0.8
t_f
06159a
t
t
t
Fig. 19
Output response as a function of V_i (on/off switching) or
inhibit control
Table 8: Inhibit response times (typ. values, outputs with ohmic load, R-input left open-circuit)
Characteristics
Conditions
t_r
Output voltage rise time V_{i nom}, R_L = V_{o nom}/I_{o nom}
(indicative values)
V_{i inh} = 2.4 → 0.8 V
t_f
V_{i min}
Output voltage fall time V_{i nom}, R_L = V_{o nom}/I_{o nom}
(indicative values)
V_{i inh} = 0.8 → 2.4 V
* Models with version V104 or higher
BQ 48Q CQ GQ DQ* EQ* Unit
1.5 1.3 1.3 1.5 1.5 1.6 ms
3.3 V 0.5 0.5 0.5 0.5 0.5 0.5
5 V 0.8 0.6 0.6 0.8 0.7 0.7
12 / 15 V 1.3 1.2 1.3 1.5 1.1 1.5
24 V
3
3
3
3
3
3
Current Sharing
The current sharing facility should be used when several
converters are operated in parallel or redundant connection.
This feature avoids that some converters are driven into
current limitation and thus produce excessive losses. As a
result, the stress of the converters is reduced, and the system
reliability is further improved.
Simple interconnection of the T pins causes the converters to
share the output current. The current tolerance of each
converter is approx. ±20% of the sum of its nominal output
currents I_{o1 nom} + I_{o2 nom}.
In n+1 redundant systems, a failure of a single converter will
not lead to a system failure, if the outputs are decoupled by
diodes; see fig. 10.
Note: T-function only increases the output voltage, until the
currents are evenly shared. If in a redundant system, one
converter fails, the remaining converters keep sharing their
currents evenly.
Since the T pins are referenced to the pins S –, the S– pins of
all converters must have the same electrical potential.
Double-output converters with both outputs connected in
series can also be paralleled with current sharing, if pins Vo1–
of all converters are connected together, see fig. 8c.
If the output voltages are programmed to a voltage other than
V_{o nom} by means of the R pin or option P, the outputs should be
adjusted individually within a tolerance of ±1%.
Important: For applications using the hot-swap capabilities,
dynamic output voltage changes during plug-in/plug-out must be
considered.
BCD20011- G Rev AG, 12-Mar-2012
Page 16 of 26
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