NQ40T40EGC08NKC-G SYNQOR [SynQor Worldwide Headquarters], NQ40T40EGC08NKC-G Datasheet - Page 7

• Manufacturer Part Number: NQ40T40EGC08NKC-G
• Description: Eighth-brick DC-DC Converter
• Manufacturer: SYNQOR [SynQor Worldwide Headquarters]

Product # NQ40x40EGC08
BASIC OPERATION AND FEATURES
These converters use a digital controller for the buck stage and
boost stage (see Figure A). It automatically changes operating
mode (buck mode or boost) when the line voltage or output set
point changes. Both stages are accomplished with synchronous
rectifiers. Very high efficiency is maintained over wide input
and output ranges by shifting operational modes and use of
synchronous rectifiers.
Figure A: Topology
W mode: Q3, Q4 are populated, Jumper is open.
T mode: Q3, Q4 are open, Jumper is populated.
The converter runs at a fixed frequency with a predictable
EMI performance.
This series of quarter-brick and eighth-brick converters use the
industry standard footprint and pin-out configuration.
CONTROL FEATURES
REMOTE ON/OFF: The ON/OFF input permits the user to con-
trol when the converter is on or off. Only Negative ON/OFF logic
is available in this power module series.
Negative logic ON/OFF signal turns the module OFF during logic
high (leave the pin floating or set voltage between 1.8~3.3 V) and
turns the module ON during logic low [tie to V
OUTPUT VOLTAGE TRIM: The output voltage can be
programmed to any voltage between 0 V dc and V
connecting one resistor between the Pin 6 (TRIM) pin and Pin 5
[Sense(-)]. For a desired output voltage, the value of the resistor
should be:
R
Vin+
Vin-
Technical Specification
trim-up
(V
Cin1
Linput
out
)
=
[(
GATE_Q1
GATE_Q2
Cin2
V
out
11900
Q1
11830
Q2
+
.0543
0.058
Phone [phone]
GATE_Q3
L
GATE_Q4
x V
max
x V
max
Q3
Q4
)
JUMPER
_ 10912
in
(-)].
Cout1
Loutput
]
www.synqor.com
( Ω )
Cout2
max
Vout+
Vout-
by
Alternatively, the TRIM pin can be driven from an external
voltage source:
V(pin6) = 2.366 –
where:
To maintain the accuracy of the output voltage over load current,
it is vital that any trim-up resistor be terminated directly to the
converter’s Sense(-) pin (S option) or Vout(-) pin (C option), not
at the connection to the load. A separate Kelvin connection to the
PCB pad for the Vout(-) is optimal.
PROTECTION FEATURES
Input Under-Voltage Lockout: The converter is designed
to turn off when the input voltage is too low, helping avoid an
input system instability problem, described in more detail in the
application note titled “Input System Instability”. The lockout
circuitry is a comparator with DC hysteresis. When the input
voltage is rising, it must exceed the typical Turn-On Voltage
Threshold value (listed on the specification page) before the
converter will turn on. Once the converter is on, the input
voltage must fall below the typical Turn-Off Voltage Threshold
value before the converter will turn off.
Output Current Shutdown:
output short condition, the unit is equipped with internal short
circuit protection. When the short protection is triggered, the
unit shutdowns first. After approximately 16 ms inhibit time, the
units turn on again. If the short condition remains, the current
limit circuit will limit the output current. The units operate
normally once the fault condition is removed.
Internal Over-Voltage Protection:
excessive output voltage, the output over-voltage shutdown
circuitry is contained. This OVP is independent of the trimmed set
point. The shutdown point is fixed on the standard option.
Over-Temperature Shutdown:
the converter senses the average temperature of the module.
The thermal shutdown circuit is designed to turn the converter
off when the temperature at the sensed location reaches the
Over-Temperature Shutdown value. It will allow the converter
to turn on again when the temperature of the sensed location
falls by the amount of the Over-Temperature Shutdown Restart
Hysteresis value.
Doc.# 005-NG4040W Rev. C
V
V
max
out
= desired output voltage
= maximum rated output voltage
2.284
2.314
(
Package:
Outputs:
Current:
V
V
max
out
Input:
)
To provide protection in an
A temperature sensor on
03/06/09
9 - 40 V
0 - 40 V
7.5 A
Eighth-brick
To fully protect from
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