QME48T40 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 40A Output
Features
•
RoHS lead-free solder and lead-solder-exempted
products are available
•
Delivers up to 40 A
•
Outputs available: 3.3, 2.5, 1.8, 1.5, 1.2 and 1.0 V
•
Industry-standard quarter-brick pinout
•
On-board input differential LC-filter
•
Startup into pre-biased load
•
No minimum load required
•
Dimensions: 1.45” x 2.30” x 0.425”
(36.83 x 58.42 x 10.80 mm)
•
Weight: 1.2 oz [34.2 g]
•
Meets Basic Insulation requirements of EN60950
•
Withstands 100 V input transient for 100 ms
•
Fixed-frequency operation
•
Fully protected
•
Remote output sense
•
Non-Latching / Latching OTP option
•
Positive or negative logic ON/OFF option
•
Output voltage trim range: +10%/−20% with
industry-standard trim equations (
±
10% for 1.2 V
and 1.0 V)
•
High reliability: MTBF = 13.9 million hours,
calculated per Telcordia TR-332, Method
I
Case 1
•
UL60950 recognized in US and Canada and
DEMKO certified per IEC/EN60950 (pending)
•
Designed to meet Class B conducted emissions per
FCC and EN55022 when used with external filter
•
All materials meet UL94, V-0 flammability rating
Applications
•
•
•
•
Telecommunications
Data communications
Wireless communications
Servers, Workstations
Benefits
•
High efficiency – no heat sink required
•
Higher current capability at 70 ºC than most
competitors’ 40 A half-bricks
Description
The QME48T40 DC-DC Series of converters provide outstanding thermal performance in high temperature
environments. This performance is accomplished through the use of patented/patent-pending circuits, packaging,
and processing techniques to achieve ultra-high efficiency, excellent thermal management, and a low-body profile.
The low-body profile and the preclusion of heat sinks minimize impedance to system airflow, thus enhancing
cooling for both upstream and downstream devices. The use of 100% automation for assembly, coupled with
advanced electronic circuits and thermal design, results in a product with extremely high reliability.
Operating from a 36-75 V input, the QME48T40 converters provide any standard output voltage from 3.3 V down
to 1.0 V that can be trimmed from –20% to +10% of the nominal output voltage (±10% for output voltages 1.2 V
and 1.0 V), thus providing outstanding design flexibility.
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Page 1 of 35
QME48T40 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 40A Output
Electrical Specifications
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vi n = 48 VDC, unless otherwise specified.
Parameter
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Storage Temperature
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
Maximum Input Current
100 ms
Continuous
Notes
Min
0
-40
-55
36
33
31
Typ
Max
80
85
125
Units
VDC
°C
°C
VDC
VDC
VDC
VDC
ADC
ADC
ADC
ADC
ADC
ADC
mA
mA
mA
mA
mA
mA
mA
mA
PK-PK
mA
PK-PK
mA
PK-PK
mA
PK-PK
mA
PK-PK
mA
PK-PK
dB
48
34
32
75
35
33
100
4.1
3.2
2.4
2.0
1.6
1.4
40 ADC Out @ 36 VDC In
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
Input Stand-by Current
Input No Load Current (0 load on the output)
Vin = 48V, converter disabled
Vin = 48V, converter enabled
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
3
50
47
45
44
43
43
10
9
9
9
8
8
60
Input Reflected-Ripple Current,
i
s
Vin = 48V, 25 MHz bandwidth
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
Input Voltage Ripple Rejection
120 Hz
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Page 2 of 35
QME48T40 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 40A Output
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Output Characteristics
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Output Voltage Set Point (no load)
Non-latching
Notes
Plus full load (resistive)
Min
Typ
Max
40,000
Units
µF
ADC
ADC
A
Arms
VDC
VDC
VDC
VDC
VDC
VDC
mV
mV
%Vout
0
42
47
50
9
3.267
2.475
1.782
1.485
1.188
0.990
3.300
2.500
1.800
1.500
1.200
1.000
±2
±2
1
40
52
60
3.333
2.525
1.818
1.515
1.212
1.010
±5
±5
+1.5
55
35
110
70
Non-latching, Short = 10 mΩ
Non-latching
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
Output Regulation Over Line
Output Regulation Over Load
Over line, load and temperature
V
OUT
= 3.3 VDC
Output Ripple and Noise – 25 MHz bandwidth Full load + 10 µF tantalum + 1 µF ceramic
V
OUT
= 1.0 VDC
Full load + 10 µF tantalum + 1 µF ceramic
Dynamic Response
Load Change 50%-75%-50% of Iout Max,
di/dt = 0.1 A/µs
di/dt = 5 A/µs
Settling Time to 1% of Vout
Efficiency
100% Load
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
50% Load
V
OUT
= 3.3 VDC
V
OUT
= 2.5 VDC
V
OUT
= 1.8 VDC
V
OUT
= 1.5 VDC
V
OUT
= 1.2 VDC
V
OUT
= 1.0 VDC
Additional Notes:
1
2
3
Output Voltage Range
-1.5
mV
PK-PK
mV
PK-PK
Co = 1 µF ceramic (Fig. 3.3V.9)
Co = 470 µF POS + 1 µF ceramic
50
2
130
15
2
2
mV
mV
µs
%
%
%
%
%
%
%
%
%
%
%
%
91.0
89.0
86.5
84.5
82.0
80.0
92.0
91.0
88.5
87.0
85.0
83.0
Operating ambient temperature range of -40 ºC to 85 ºC for converter.
See waveforms for dynamic response and settling time for different output voltages.
Vout can be increased up to 10% via the sense leads or 10% via the trim function. However, the total output voltage trim from all sources
should not exceed 10% of V
OUT
(
NOM
), in order to ensure specified operation of overvoltage protection circuitry
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Page 3 of 35
QME48T40 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 40A Output
Electrical Specifications (continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
Isolation Characteristics
I/O Isolation
Isolation Capacitance
Isolation Resistance
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
3
Notes
Min
2000
Typ
Max
Units
VDC
2
10
460
Non-latching (3.3 - 1.5 V)
3
nF
MΩ
kHz
+10
+10
+10
%
%
%
%
ms
ms
0.8
20
20
0.8
VDC
VDC
VDC
VDC
-20
-10
117
128
200
4
-20
2.4
2.4
-20
Remote Sense Compensation
Auto-Restart Period
Turn-On Time
Non-latching (1.2 V and 1.0 V)
Percent of V
OUT
(
NOM
)
Non-latching
Applies to all protection features
Output Overvoltage Protection
140
ON/OFF Control (Positive Logic)
Converter Off (logic low)
Converter On (logic high)
ON/OFF Control (Negative Logic)
Converter Off (logic high)
Converter On (logic low)
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Page 4 of 35
QME48T40 DC-DC Series Data Sheet
36-75 VDC Input; 1.0-3.3 VDC @ 40A Output
Operations
Input and Output Impedance
These power converters have been designed to be
stable with no external capacitors when used in low
inductance input and output circuits.
In many applications, the inductance associated with
the distribution from the power source to the input of
the converter can affect the stability of the converter.
The addition of a 33 µF electrolytic capacitor with an
ESR < 1
Ω
across the input helps to ensure stability
of the converter. In many applications, the user has
to use decoupling capacitance at the load. The
power converter will exhibit stable operation with
external load capacitance up to 40,000 µF on 3.3 V –
1.0 V outputs.
Additionally, see the EMC section of this data sheet
for discussion of other external components which
may be required for control of conducted emissions.
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter
on or off remotely via a system signal. There are two
remote control options available, positive and
negative logic, with both referenced to Vin(-). A
typical connection is shown in Fig. A.
QME Series
Converter
(Top View)
Vin
ON/OFF
ON/OFF input, in which case it must be capable of
sourcing or sinking up to 1 mA depending on the
signal polarity. See the Startup Information section
for system timing waveforms associated with use of
the ON/OFF pin.
Remote Sense (Pins 5 and 7)
The remote sense feature of the converter
compensates for voltage drops occurring between
the output pins of the converter and the load. The
SENSE(-) (Pin 5) and SENSE(+) (Pin 7) pins should
be connected at the load or at the point where
regulation is required (see Fig. B).
QME Series
Vin (+)
Converter
(Top View)
Vin
ON/OFF
Vout (+)
100
Rw
SENSE (+)
TRIM
SENSE (-)
10
Rload
Vin (-)
Vout (+)
Rw
Fig. B:
Remote sense circuit configuration.
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be
connected to the Vout(-) pin (Pin 4), and the SENSE(+) pin
must be connected to the Vout(+) pin (Pin 8) to ensure the
converter will regulate at the specified output voltage. If these
connections are not made, the converter will deliver an
output voltage that is slightly higher than the specified data
sheet value.
Vin (+)
Vout (+)
SENSE (+)
TRIM
SENSE (-)
Rload
Vin (-)
CONTROL
INPUT
Vout (-)
Because the sense leads carry minimal current,
large traces on the end-user board are not required.
However, sense traces should be run side by side
and located close to a ground plane to minimize
system noise and ensure optimum performance.
The converter’s output overvoltage protection (OVP)
senses the voltage across Vout(+) and Vout(-), and
not across the sense lines, so the resistance (and
resulting voltage drop) between the output pins of
the converter and the load should be minimized to
prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must
be taken not to exceed the maximum allowable
output power capability of the converter, which is
equal to the product of the nominal output voltage
and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the
converter can be increased by as much as 10%
above the nominal rating in order to maintain the
required voltage across the load. Therefore, the
designer must, if necessary, decrease the maximum
current (originally obtained from the derating curves)
by the same percentage to ensure the converter’s
Page 5 of 35
Fig. A:
Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF
pin is at a logic high and turns off when at a logic
low. The converter is on when the ON/OFF pin is left
open. See the Electrical Specifications for logic
high/low definitions.
The negative logic version turns on when the pin is
at a logic low and turns off when the pin is at a logic
high. The ON/OFF pin can be hardwired directly to
Vin(-) to enable automatic power up of the converter
without the need of an external control signal.
The ON/OFF pin is internally pulled up to 5 V
through a resistor. A properly debounced mechanical
switch, open-collector transistor, or FET can be used
to drive the input of the ON/OFF pin. The device
must be capable of sinking up to 0.2 mA at a low
level voltage of
≤
0.8 V. An external voltage source
(±20 V maximum) may be connected directly to the
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