Data Sheet
16V Pico TLynxTM 4A: Non-isolated DC-DC Power Modules
8 – 16Vdc input; 0.6Vdc to 8.0Vdc output; 4A output current
September 13, 2010
5.91
Vo − 0.591
Rtrim =
kΩ
Overcurrent Protection
(
)
To provide protection in a fault (output overload)
condition, the unit is equipped with internal
current-limiting circuitry and can endure current
limiting continuously. At the point of current-limit
inception, the unit enters hiccup mode. The unit
operates normally once the output current is brought
back into its specified range.
Rtrim is the external resistor in kΩ
Vo is the desired output voltage.
Table 1 provides Rtrim values required for some
common output voltages.
Table 1
Overtemperature Protection
VO, set (V)
0.6
Rtrim (KΩ)
656.7
14.45
9.704
6.502
4.888
3.096
2.182
1.340
1.000
0.798
To provide protection in a fault condition, the unit is
equipped with a thermal shutdown circuit. The unit will
shutdown if the overtemperature threshold of 140oC is
exceeded at the thermal reference point Tref . The
thermal shutdown is not intended as a guarantee that
the unit will survive temperatures beyond its rating.
Once the unit goes into thermal shutdown it will then
wait to cool before attempting to restart.
1.0
1.2
1.5
1.8
2.5
3.3
5.0
6.5
Input Undervoltage Lockout
At input voltages below the input undervoltage lockout
limit, the module operation is disabled. The module
will begin to operate at an input voltage above the
undervoltage lockout turn-on threshold.
8.0
By using a ±0.5% tolerance trim resistor with a TC of
±100ppm, a set point tolerance of ±1.5% can be
achieved as specified in the electrical specification.
Output Voltage Programming
The output voltage of the 16V Pico TLynxTM 4A
modules can be programmed to any voltage from
0.59dc to 8.0Vdc by connecting a resistor between
the Trim and GND pins of the module. Certain
restrictions apply on the output voltage set point
depending on the input voltage. These are shown in
the Output Voltage vs. Input Voltage Set Point Area
plot in Fig. 56.
Remote Sense
The 16V Pico TLynxTM 4A power modules have a
Remote Sense feature to minimize the effects of
distribution losses by regulating the voltage at the
SENSE pin. The voltage between the SENSE pin
and VOUT pin must not exceed 0.5V. Note that the
output voltage of the module cannot exceed the
specified maximum value. This includes the voltage
drop between the SENSE and Vout pins. When the
Remote Sense feature is not being used, connect the
SENSE pin to the VOUT pin.
18
16
14
12
10
8
VIN(+)
VO(+)
SENSE
TRIM
6
4
ON/OFF
2
LOAD
0
0.5
1
1.5
2
2.5
3
3.5
4 4.5 5 5.5 6 6.5 7 7.5 8
Output Voltage (V)
Rtri m
GND
Figure 56. Output Voltage vs. Input Voltage Set
Point Area plot showing limits where the output
voltage can be set for different input voltages.
Figure 57. Circuit configuration for programming
output voltage using an external resistor.
Without an external resistor between Trim and GND
pins, the output of the module will be 0.59Vdc. To
calculate the value of the trim resistor, Rtrim for a
desired output voltage, use the following equation:
LINEAGE POWER
16
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