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T Series Data Sheet
?
Auxiliary Functions
Available Signals and Status Monitoring
The T Series exhibits an inhibit function as well as several
voltage monitoring and indicating functions for easy control
500 Watt AC-DC Converters
With option D, the output voltage can be sensed externally, for
example, to monitor the system bus decoupled from the power
supplies by diodes or fuses. An external resistor of 43.2 k ? 1%
(21.5 k ? for T1840) must be fitted into the sense line to the
bus; see fig. below.
and surveillance of a complete customer-specific power supply
system. All the surveillance functions are driven from the
06051a
Vo+ 12
F
–
+
output. Consequently, it also operates, when the input voltage
is off, down to an output voltage of 5 V. The power consumption
of the surveillance circuit is typically 10 to 20 mA.
Vo – 22
External
Available functions:
– Power Down
– System Good
D
D set
Sys In
pin
pin
pin
30
32
24
T1000-7D
R ext
D set 32
R
43.2 k ?
(21.5 k ? )
adjustment of the
threshold level V t
– Inhibit/Vcr remote control
Sys Out
i/Vcr
pin
pin
26
28
Fig. 21
Option D (D-set internally not connected); the power down
The status is indicated by 3 LEDs on the front panel:
circuitry monitors the power bus decoupled by the fuse F.
– System
– V o
– Error
(OK)
(OK)
green
green
red
Adjustment of the threshold level
With the resistor ( R ext ) connected to D set (pin 32) and Vo– (or
Test sockets at the front panel allow easy measurement of V o .
Power Down Function
Vo+), the low threshold level can be increased (or decreased)
respectively; see fig. 20 and 21.
If the D set input is left open-circuit, the low threshold level of
The power down circuitry monitors V o and changes the status
of output D (pin 30) from low to high impedance, when V o falls
below the low threshold level, and changes back to low
the power down circuitry is factory-set to:
T12xx: V t set = 21 V
T17xx: V t set = 42.5 V
±0.2 V
±0.5 V
impedance, when V o exceeds the upper threshold level.
VT18xx:
V t set = 32 V
±0.4 V
The rectifier versions have a relatively small hysteresis of 1 V,
the battery charger versions have a large hysteresis. The
upper threshold level is given, but the low threshold level is
externally adjustable at the D set pin 32. The Power Down
The approximate resistor values for given threshold levels can
be calculated from the table below:
Table 10: Calculation of R ext
signal D (pin 30) can for example be used as a save data
signal, for low voltage warning, as a low-battery signal to avoid
Model V t > V t set
( R ext connected to Vo–)
V t < V t set
( R ext connected to Vo+)
R ext ( V t ) = –––––––– [k ? ] R ext ( V t ) = ––––––––––––– [k ? ]
R ext ( V t ) = –––––––– [ k ? ] R ext ( V t ) = ––––––––––––– [k ? ]
R ext ( V t ) = –––––––– [ k ? ] R ext ( V t ) = ––––––––––––– [k ? ]
deep discharge of the battery, or to prevent connected
converters from starting-up at a low bus voltage. For
application examples, see figures below using the signal D.
As it is driven from the output, the power pown circuitry
operates independently of the input voltage and the load
conditions, even if the converter is inhibited.
The standard version monitors V o internally; see fig. below.
T12xx
T17xx
T18xx
463.5 43.2 V t – 463.5
V t –21.0 21.0 – V t
933 43.2 V t – 933
V t – 42.5 42.5 – V t
461 21.4 V t – 461
V t – 32 32 – V t
The threshold level is adjusted for a DC output voltage. If in
06050a
Vo+
–
+
operation a sinusoidal low frequency output ripple is
superimposed to the DC output voltage, it can be estimated
with V ov = I o /(2 ? π ? f ? C o ), where C o is the internal output
R int
43.2 k ?
(21.5 k ?)
Vo –
capacitance.
Table 11: Typ. values for R ext for a given V t value for LT1740
R ext
Characteristics
Conditions
V t
Unit
D set
External adjustment of
the threshold level V t
V t
Power down threshold
level,
set by R ext
69 k ? to Vo+
106 k ? to Vo+
254 k ? to Vo+
34.4
36.4
39.5
V
left open-circuit
42.5
Fig. 20
Standard version; the power down circuitry monitors directly
V o via R int . R ext is not necessary.
309 k ? to Vo–
154 k ? to Vo–
102 k ? to Vo–
45.5
48.5
51.6
BCD20023 Rev AB, 02-Nov-2010
Page 13 of 31
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