Q48SG12034

FEATURES

High efficiency: 96% @11.8V/34A

Size:
Without Heat spreader:
58.4 x 36.8 x 11.2mm (2.30”x1.45”x0.44”)
With heat spreader:
58.4 x 36.8 x 12.7mm (2.30”x1.45”x0.50”)

PMBus Rev.1.2 compliance

Industry standard, DOSA compliant pin out

Can be connected in parallel directly

Parallel and Droop current sharing

Fixed frequency operation

Input UVLO, Output OCP & OVP, OTP

Monotonic startup into normal and Pre-biased
loads

2250V Isolation and basic insulation

No minimum load required

ISO 9001, TL 9000, ISO 14001, QS 9000,
OHSAS 18001 certified manufacturing facility

Delphi Series Q48SG Quarter Brick Family
Full Digital Control DC/DC Power Modules:
48V In, 11.8V/34A Out
The Delphi Series Q48SG, 38~75V input, isolated single output,
Quarter Brick, are full digital control DC/DC converters, and are the
latest offering from a world leader in power systems technology and
manufacturing ― Delta Electronics, Inc. The Q48SG series provide
up to 400 watts of power in an industry standard, DOSA compliant
footprint and pin out; the typical efficiency is 96% at 48V input,
11.8V output and 34A load. There is a built-in digital PWM controller
in the Q48SG series, which is used to complete the Vo feedback,
PWM signal generation, droop current sharing, fault protection, and
PWBUS communications, and so on. With the digital control, many
design and application flexibility, advanced performance, and
reliability are obtained; and the Q48SG series can be connected in
parallel directly for higher power without add external oring-fet.
DATASHEET
DS_Q48SG12034_08062014
UL/cUL 60950-1 (US & Canada) to be
recognized
OPTIONS

Digital PMBus interface

Parallel and Droop Current sharing

Trim

Positive On/Off logic

With heatspreader

Short pin lengths available
APPLICATIONS

Telecom / DataCom

Wireless Networks

Optical Network Equipment

Server and Data Storage

Industrial/Test Equipment
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
NOTES and CONDITIONS
Q48SG12034 (Standard)
Min.
ABSOLUTE MAXIMUM RATINGS
Input Voltage
Continuous
Transient (100ms)
On/off Pin Voltage
Other Pin Voltage
Operating Ambient Temperature
Storage Temperature
Input/Output Isolation Voltage
INPUT CHARACTERISTICS
Operating Input Voltage
Input Under-Voltage Lockout
Turn-On Voltage Threshold
Turn-Off Voltage Threshold
Maximum Input Current
No-Load Input Current
Off Converter Input Current
2
Inrush Current(I t)
Input Terminal Ripple Current
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
OUTPUT CHARACTERISTICS
The module without droop current sharing option code
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
The module with droop current sharing option code
Output Voltage Set Point
Output Voltage Regulation
Over Load
Over Line
Over Temperature
Total Output Voltage Range
Both With and without droop current sharing option code
Output Voltage Ripple and Noise
Peak-to-Peak
RMS
Operating Output Current Range
Output DC Current-Limit Inception
Output Voltage Trim Range
DYNAMIC CHARACTERISTICS
Output Voltage Current Transient
Output voltage overshoot and undershoot
Setting Time (within 1% Vout nominal)
Output voltage overshoot and undershoot
Setting Time (within 1% Vout nominal)
Turn-On Transient
Start-Up Time, From On/Off Control
Start-Up Time, From Input
Output Capacitance
EFFICIENCY
100% Load
60% Load
ISOLATION CHARACTERISTICS
Input to Output
Isolation Resistance
Isolation Capacitance
FEATURE CHARACTERISTICS
Current sharing accuracy
Switching Frequency
ON/OFF Control
Logic Low
Logic High
ON/OFF Current (for both remote on/off logic)
ON/OFF Current (for both remote on/off logic)
Leakage Current (for both remote on/off logic)
Output Voltage Trim Range
Output Over-Voltage Protection
DS_Q48SG12034_08062014
Typ.
Vdc
Vdc
V
-50
-0.3
3.6
V
-40
-55
85
125
2250
°C
°C
Vdc
38
75
Vdc
35.5
33.5
11.5
110
23
1
0.48
Vdc
Vdc
A
mA
mA
2
As
A
mA
dB
32.5
30.5
Vin=38V, 100% Load,
With 100uF external input capacitor
RMS, With 100uF input cap.
P-P thru 12µH inductor, 5Hz to 20MHz
120 Hz
Vin=48V, Io=Io.max, Tc=25°C
Units
80
100
50
100ms
Trim/Current Sharing, C2, Data, SMBAlert, Clock, Addr1,
Addr0
Max.
34
32
11.33
75
18
0.32
20
50
11.75
11.8
11.85
Vdc
Io=Io,min to Io,max
Vin=38V to 75V
Tc=-40°C to 125°C
over sample load, and temperature, from 38~75V Vin
60
50
11.6
20
20
±120
11.8
12.0
mV
mV
mV
V
Vin=48V, Io=0A, Tc=25°C
12.25
12.3
12.35
Vdc
600
50
11.6
500
20
±120
12.3
12.5
mV
mV
mV
V
0
110
200
80
34
150
mV
mV
A
%
-20
10
%
400
300
450
1000
mV
µs
mV
µs
120
130
16000
ms
ms
µF
Io=Io,min to Io,max
Vin=38V to 75V
Tc=-40°C to 125°C
over sample load, and temperature, from 38~75V Vin
5Hz to 20MHz bandwidth
Full Load, 1µF ceramic, 10µF tantalum
Full Load, 1µF ceramic, 10µF tantalum
Full input voltage range
Output Voltage 10% Low
Vin=48V, Pout ≦ max rated power;
For droop parallel module, such function is disabled.
100
40
48V, 10µF Tan & 1µF Ceramic load cap, 0.1A/µs
0.1A/µs, 50% to 75% Io.max, 10µF Tan load cap
200
2.5A/µs, 25% to 75% Io.max, 4000µF Tan load cap
300
100
110
220
Vin=48V
Vin=48V
94.7
95.2
95.5
96.0
%
%
2250
Vdc
MΩ
pF
10
%
kHz
0.8
50
0.5
V
V
mA
µA
µA
%
V
10
1500
130
Von/off
Von/off
Ion/off at Von/off=0.0V
Ion/off at Von/off=2.4V
Logic High, Von/off=15V
Vin=48V, Pout ≦ max rated power
Over full temp range; % of nominal Vout
-0.7
2.4
10
-20
14
50
10
16
2
TECHNICAL SPECIFICATIONS
(TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted.)
PARAMETER
NOTES and CONDITIONS
Q48SG12034 (Standard)
Min.
PMBus Signal Interface Characteristics
Logic Input Low (VIL)
Logic Input High (VIH)
Logic Onput Low (VOL)
Logic Onput High (VOH)
PMBus Operating Frequency Range
PMBus Monitoring CHARACTERISTICS
Output Current Reading Accuracy
C2, Data, SMBAlert, Clock pin
C2, Data, SMBAlert, Clock pin
C2, Data, SMBAlert, Clock pin; IOL=6mA
C2, Data, SMBAlert, Clock pin; IOH=-6mA
Over-Temperature Shutdown
Over-Temperature Shutdown
Over-Temperature Shutdown
0
2.1
Io=50% ~ 100% of Io, max;
Io=5% ~ 50% of Io, max;
Output Voltage Reading Accuracy
Input Voltage Reading Accuracy
Temperature Reading Accuracy
GENERAL SPECIFICATIONS
MTBF
Weight
Weight
Io=80% of Io, max; 300LFM; Ta=25°C
Without heat spreader
With heat spreader
Refer to Figure 22 for Hot spot 1 location
(48Vin,80% Io, 200LFM,Airflow from Vin+ to Vin-)
Refer to Figure 24 for Hot spot 2 location
(48Vin,80% Io, 200LFM,Airflow from Vin+ to Vin-)
Refer to Figure 22 for NTC resistor location
( Without heat spreader)
(With heat spreader)
( NTC resistor )
Typ.
Max.
Units
0.8
3.3
0.4
2.6
100
400
V
V
V
V
KHz
-5
-2
-2
-4
-5
+5
+2
+2
+4
+5
%
A
%
%
℃
2.9
52.5
66.5
M hours
grams
grams
128
°C
115
°C
125
°C
Note: Please attach thermocouple on NTC resistor to test OTP function, the hot spots’ temperature is just for reference.
PIN DEFINATION
Pin#
Name
Function
Pin#
Name
Function
Secondary on/off control pin; The default configuration is set to ignore this input. And such pin can be
1
VIN(+)
7
C2
reconfigured by the PMBus Interface.
2
ON/OFF Primary on/off control pin
8
Sig_Gnd
Signal ground
3
VIN(-)
9
Data
PMBus data line
4
VOUT(-)
10
SMBAlert PMBus SMBAlert line
5
Trim
11
Clock
PMBus clock line
6
VOUT(+)
12
Addr1
ADDR1 pin sets the high order digit of the address.
13
Addr0
ADDR0 pin sets the low order digit of the address.
Trim pin
SIMPLIFIED APPLICATION CIRCUIT
Delta DC/DC
Module
Fuse
Input
Source
EMI filter
Reverse
polarity
Protection
Addr0
Addr1
Vin(+)
Vout(+)
On/off
Trim
Vin(-)
Vout(-)
Load
SMB
CLOCK DATA -ALERT C2
On/off control
CLK DATA ALERT
CTRL
System MCU
DS_Q48SG12034_08062014
3
ELECTRICAL CHARACTERISTICS CURVES
Figure 1: Efficiency vs. load current for minimum, nominal, and maximum Figure 2: Power dissipation vs. load current for minimum, nominal, and
input voltage at 25°C
maximum input voltage at 25°C
Input Current (A)
12
10
8
6
4
2
0
30
34
38
42
46
50
54
58
62
66
70
74
Input Voltage (V)
Figure 3: Typical full load input characteristics at room temperature
DS_Q48SG12034_08062014
Figure 4: Output voltage regulation vs load current showing typical
current limit curves and converter shutdown points for nominal input
voltage at room temperature
4
ELECTRICAL CHARACTERISTICS CURVES
For Negative Remote On/Off Logic
Figure 5: Turn-on transient at zero load current (20ms/div).
Vin=48V. Top Trace: Vout, 5V/div; Bottom Trace: ON/OFF input,
2V/div
Figure 6: Turn-on transient at full rated load current (constant
current load) (20 ms/div). Vin=48V. Top Trace: Vout, 5V/div;
Bottom Trace: ON/OFF input, 2V/div
For Input Voltage Start up
Figure 7: Turn-on transient at zero load current (20 ms/div).
Vin=48V. Top Trace: Vout, 5V/div, Bottom Trace: input voltage,
20V/div
DS_Q48SG12034_08062014
Figure 8: Turn-on transient at full rated load current (constant
current load) (20 ms/div). Vin=48V. Top Trace: Vout, 5V/div;
Bottom Trace: input voltage,20V/div
5
ELECTRICAL CHARACTERISTICS CURVES
Figure 9: Output voltage response to step-change in load
current (75%-50% of Io, max; di/dt = 0.1A/µs, Vin=48V). Load
cap: 10µF, tantalum capacitor and 1µF ceramic capacitor. Top
Trace: Vout (200mV/div, 200us/div); Bottom Trace: Io (15A/div,
200us/div). Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module..
is
Figure 10: Output voltage response to step-change in load
current (50%-75% of Io, max; di/dt = 0.1A/µs, Vin=48V). Load
cap: 10µF, tantalum capacitor and 1µF ceramic capacitor. Top
Trace: Vout (200mV/div, 200us/div); Bottom Trace: Io (15A/div,
200us/div). Scope measurement should be made using a BNC
cable (length shorter than 20 inches). Position the load
between 51 mm to 76 mm (2 inches to 3 inches) from the
module..
ic
Vin+
+
+
Vin-
Cs: 220uF
100uF,
ESR=0.2 ohm @
25oC 100KHz
Figure 11: Test set-up diagram showing measurement points
for Input Terminal Ripple Current and Input Reflected Ripple
Current.
Note: Measured input reflected-ripple current with a simulated
source Inductance (LTEST) of 12 μH. Capacitor Cs offset
possible battery impedance. Measure current as shown below
DS_Q48SG12034_08062014
Figure 12: Input Terminal Ripple Current, ic, at full rated output
current and nominal input voltage with 12µH source impedance
and 100µF electrolytic capacitor (100 mA/div, 2us/div).
6
ELECTRICAL CHARACTERISTICS CURVES
Copper
Strip
Vo(+)
10u
1u
SCOPE
RESISTIVE
LOAD
Vo(-)
Figure 13: Input reflected ripple current, is, through a 12µH
source inductor at nominal input voltage and rated load current
(20 mA/div, 5us/div).
Figure 14: Output voltage noise and ripple measurement test
setup
Figure 15: Output voltage ripple at nominal input voltage and
rated load current (50 mV/div, 2us/div)
Load capacitance: 1µF ceramic capacitor and 10µF tantalum
capacitor. Bandwidth: 20 MHz. Scope measurements should be
made using a BNC cable (length shorter than 20 inches).
Position the load between 51 mm to 76 mm (2 inches to 3
inches) from the module.
DS_Q48SG12034_08062014
7
DESIGN CONSIDERATIONS
Input Source Impedance
The impedance of the input source connecting to the
DC/DC power modules will interact with the modules and
affect the stability. A low ac-impedance input source is
recommended. If the source inductance is more than a
few μH, we advise adding a 100 to 200 μF electrolytic
capacitor (ESR < 0.7 Ω at 100 kHz) mounted close to the
input of the module to improve the stability.
Layout and EMC Considerations
Delta’s DC/DC power modules are designed to operate
in a wide variety of systems and applications. For design
assistance with EMC compliance and related PWB
layout issues, please contact Delta’s technical support
team. An external input filter module is available for
easier EMC compliance design. Below is the reference
design for an input filter tested with Q48SG120XXXXXX
to meet class B in CISSPR 22.
For parallel application
Cin is 100uF low ESR Aluminum cap x 2pcs in parallel;
CX1 is 2.2uF ceramic cap×2pcs in parallel;
CX2 is 2.2uF ceramic cap;
CY1 is 47nF ceramic cap x 2pcs in parallel;
CY2 is 47nF ceramic cap x 2pcs in parallel;
CY is 3.3nF ceramic cap;
L1 is Pulse P0469NL (0.63mH/11.6A) x 2pcs in parallel;
L2 is Pulse P0469NL (0.63mH/11.6A) x 2pcs in parallel;
Test Result: Vin=48V, Io=68A
dBμV
80.0
Limits
55022MQP
55022MAV
70.0
60.0
50.0
40.0
Transducer
8130
Schematic and Components List
Traces
PK+
AV
30.0
20.0
10.0
0.0
150 kHz
1 MHz
10 MHz
30 MHz
The blue line is quasi peak mode and the green one is
average mode.
For Single Module Application
Cin is 100uF low ESR Aluminum cap;
CX1 is 2.2uF ceramic cap×2pcs in parallel;
CX2 is 2.2uF ceramic cap;
CY1 and CY2 are 47nF ceramic cap;
CY is 3.3nF ceramic cap;
L1 and L2 are common-mode inductors, L1=L2=0.47mH;
Test Result: Vin=48V, Io=34A
dBμV
80.0
Limits
55022MQP
55022MAV
70.0
60.0
50.0
40.0
Transducer
8130
Traces
PK+
AV
30.0
20.0
10.0
0.0
150 kHz
1 MHz
DS_Q48SG12034_08062014
10 MHz
30 MHz
8
Safety Considerations
The power module must be installed in compliance with
the spacing and separation requirements of the
end-user’s safety agency standard, i.e., UL60950-1,
CSA C22.2 NO. 60950-1 2nd, IEC 60950-1 2nd : 2005,
EN 60950-1 2nd: 2006+A11+A1: 2010, if the system in
which the power module is to be used must meet safety
agency requirements.
Basic insulation based on 75 Vdc input is provided
between the input and output of the module for the
purpose of applying insulation requirements when the
input to this DC-to-DC converter is identified as TNV-2
or SELV. An additional evaluation is needed if the
source is other than TNV-2 or SELV.
When the input source is SELV circuit, the power module
meets SELV (safety extra-low voltage) requirements. If
the input source is a hazardous voltage which is greater
than 60 Vdc and less than or equal to 75 Vdc, for the
module’s output to meet SELV requirements, all of the
following must be met:

The input source must be insulated from the ac
mains by reinforced or double insulation.

The input terminals of the module are not operator
accessible.

A SELV reliability test is conducted on the system
where the module is used, in combination with the
module, to ensure that under a single fault,
hazardous voltage does not appear at the module’s
output.
When installed into a Class II equipment (without
grounding), spacing consideration should be given to
the end-use installation, as the spacing between the
module and mounting surface have not been evaluated.
The power module has extra-low voltage (ELV) outputs
when all inputs are ELV.
This power module is not internally fused. To achieve
optimum safety and system protection, an input line fuse
is highly recommended. The safety agencies require a
Fast-acting fuse with 30A maximum rating to be
installed in the ungrounded lead. A lower rated fuse can
be used based on the maximum inrush transient energy
and maximum input current.
Soldering and Cleaning Considerations
Post solder cleaning is usually the final board assembly
process before the board or system undergoes electrical
testing. Inadequate cleaning and/or drying may lower the
reliability of a power module and severely affect the
finished circuit board assembly test. Adequate cleaning
and/or drying is especially important for un-encapsulated
and/or open frame type power modules. For assistance
on appropriate soldering and cleaning procedures,
please contact Delta’s technical support team.
DS_Q48SG12034_08062014
9
FEATURES DESCRIPTIONS
Over-Current Protection
The modules include an internal output over-current
protection circuit. If the output current exceeds the OCP
set point, the modules will shut down, and enter hiccup
mode or latch mode. For hiccup mode, the module will
try to restart after shutdown. If the overload condition
still exists, the module will shut down again. This restart
trial will continue until the overload condition is
corrected. For latch mode, the module will shut down
and not attempt to restart. The latch is reset by either
cycling the input power or by toggling the primary on/off
signal for one second. The OCP threshold and
protection mode can be reconfigured by the PMBus
Interface; the default configuration is hiccup mode.
Over-Voltage Protection
The primary remote on/off can be controlled by an
external switch between the on/off terminal and the Vi(-)
terminal. The switch can be an open collector or open
drain. If the remote on/off feature is not used, for negative
logic, please short the on/off pin to Vi(-); For positive logic,
please leave the on/off pin floating. The module will not
response to the remote on/off signal which is less than
120us. The primary remote on/off logic can be
reconfigured by the PMBus Interface.
Vo(+)
Vi(+)
R
ON/OFF
Vi(-)
Load
Vo(-)
Figure 17: Remote on/off implementation
The modules include an internal output over-voltage
protection circuit. If output voltage exceeds the
over-voltage set point, the module will shut down, and
enter in hiccup mode or latch mode. For hiccup mode,
the module will try to restart after shutdown. If the output
overvoltage condition still exists, the module will shut
down again. This restart trial will continue until the
over-voltage condition is corrected. For latch mode, the
module will shut down and not attempt to restart. The
latch is reset by either cycling the input power or by
toggling the primary on/off signal for one second. The Vo
OVP threshold and protection mode can be reconfigured
by the PMBus Interface; The default configuration is
hiccup mode.
Secondary Remote On/Off
Over-Temperature Protection
Parallel and Droop Current Sharing
The modules include an internal over-temperature
protection circuit. If the module temperature exceeds the
over-temperature threshold the module will shut down,
and enter in auto-recovery mode or latch mode. For
auto-recovery mode, the module will monitor the module
temperature after shutdown. Once the temperature is
dropped and within the specification, the module will be
auto-recovery. For latch mode, the module will shut
down and not attempt to restart. The latch is reset by
either cycling the input power or by toggling the primary
on/off signal for one second. The OTP threshold and
protection mode can be reconfigured by the PMBus
Interface; The default configuration is hiccup mode.
The modules are capable of operating in parallel, and
realizing current sharing by droop current sharing
method. There is about 500mV output voltage droop
from 0A to full output Load, and there is no current
sharing pin. By connectting the Vin pin and the Vo pin of
the parallel module together, the current sharing can be
realized automatically.
Primary Remote On/Off
The primary remote on/off feature on the module can be
either negative or positive logic. Negative logic turns the
module on during a logic low and off during a logic high.
Positive logic turns the modules on during a logic high
and off during a logic low.
DS_Q48SG12034_08062014
Reference to the Vo(-) terminal, there is a C2 pin. The
default configuration is set to ignore this input. And such
pin can be reconfigured as secondary remote on/off pin
by the PMBus interface including either negative or
positive logic. Negative logic turns the module on during
a logic low and off during a logic high. Positive logic
turns the modules on during a logic high and off during a
logic low. The secondary remote on/off can be controlled
by an external switch between the on/off terminal and
the Vo(-) terminal. The switch can be an open collector
or open drain.
Vin+
On/off
Vin
Vo+
Module I
Vin-
Vo-
Vin+
Vo+
On/off
Vin-
Load
Module II
Vo-
Figure 18: Parallel and droop current sharing configuration for
no redundancy requirement system
10
FEATURES DESCRIPTIONS (CON.)
If system has no redundancy requirement, the module
can be parallel directly for higher power without adding
external oring-fet; whereas, If the redundancy function is
required, the external oring-fet should be added.
For a normal parallel operation the following
precautions must be observed:
1. The current sharing accuracy equation is:
X% = | Io – ( Itotal / N ) | / Irated, Where,
Io is the output current of per module;
Itotal is the total load current;
N is parallel module numbers;
Irated is the rated full load current of per module.
2. To ensure a better steady current sharing accuracy,
below design guideline should be followed:
a) The inputs of the converters must be connected to the
same voltage source; and the PCB trace resistance
from Input voltage source to Vin+ and Vin- of each
converter should be equalized as much as possible.
b) The PCB trace resistance from each converter’s
output to the load should be equalized as much as
possible.
c) For accurate current sharing accuracy test, the
module should be soldered in order to avoid the
unbalance of the touch resistance between the modules
to the test board.
3. To ensure the parallel module can start up
monotonically without trigging the OCP circuit, below
design guideline should be followed:
a) Before all the parallel module finished start up, the
total load current should be lower than the rated current
of 1 module.
b) The ON/OFF pin of the converters should be
connected together to keep the parallel modules start up
at the same time.
c) The under voltage lockout point will slightly vary from
unit to unit. The dv/dt of the rising edge of the input
source voltage must be greater than 1V/ms to ensure
that the parallel module start up at the same time.
PMBus Communication
The module has a digital PMBus interface to allow the
module to be monitored, controlled and configured by
the system. The module supports 4 PMBus signal lines,
Data, Clock, SMBALERT (optional), Control (C2 pin,
optional), and 2 Address line Addr0 and Addr1. More
detail PMBus information can be found in the PMB
Power Management Protocol Specification, Part I and
part II, revision 1.2; which is shown in http://pmbus.org .
Both 100kHz and 400kHz bus speeds are supported by
the module. Connection for the PMBus interface should
be following the High Power DC specifications given in
section 3.1.3 in the SMBus specification V2.0 or the Low
Power DC specifications in section 3.1.2. The complete
SMBus specification is shown in http://smbus.org.
DS_Q48SG12034_08062014
The module supports the Packet Error Checking (PEC)
protocol. It can check the PEC byte provided by the
PMBus master, and include a PEC byte in all message
responses to the master.
SMBALERT protocol is also supported by the module.
SMBALERT line is also a wired-AND signal; by which
the module can alert the PMBUS master via pulling the
SMBALERT pin to an active low. There are two ways
that the master and the module response to the alert of
SMBALERT line.
One way is for the module used in a system that does
not support Alert Response Address (ARA). The module
is to retain it’s resistor programmed address, when it is in
an ALERT active condition. The master will
communicate with the slave module using the
programmed address, and using the various
READ_STATUS commands to find who cause for the
SMBALERT. The CLEAR_FAULTS command will clear
the SMBALERT.
The other way is for the module used in a system that
does support Alert Response Address (ARA). In this case,
the master simultaneously accesses all SMBALERT
devices through the ARA. Only the device which pulled
SMBALERT low will acknowledge the ARA. The master is
expected to perform the modified received byte operation
to get the address of the alert slave, and retire the
SMBALERT active signal. And then, the alter slave will
return to it’s resistor programmed address, allowing
normal master-slave communications to proceed.
If more than one slave pulls SMBALERT line low, the
lowest address slave will win communication rights via
standard arbitration during the slave address transfer.
After acknowledging the ARA, the lowest address slave
must disengage its SMBALERT pull down. If the master
still sees SMBALERT line low, it knows to send another
ARA and ask again “Now, who is holding the alert down”.
The second slave is now locked-up and can’t responsive.
But the solution is easy; the master should now initiate a
“dummy command”, for example read command on the
bus and read any parameter from any slave. After this, the
second slave (the one that lost arbitration in the first run)
will be released. Now, if master sends the second ARA,
the second slave will provide its address to the Master.
The module contains a data flash used to store
configuration settings, which will not be programmed into
the
device
data
flash
automatically.
The
STORE_DEFAULT_ALL command must be used to
commit the current settings are transfer from RAM to
data flash as device defaults.
PMBUS Addressing
The Module has flexible PMBUS addressing capability.
When connect different resistor from Addr0 and Addr1
pin to GND pin, 64 possible addresses can be acquired.
The address is in the form of octal digits; Each pin offer
one octal digit, and then combine together to form the
decimal address as shown in below.
Address = 8 * ADDR1 + ADDR0
11
FEATURES DESCRIPTIONS (CON.)
Corresponded to each octal digit, the requested
resistor values are shown in below, and +/-5%
resistors accuracy can be accepted. If there is any
resistances exceeding the requested range, address
127 will be return. 0-12 and 40, 44, 45, and 55 in
decimal address can’t be used, since they are
reserved according to the SMBus specifications, and
which will also return address 127.
Octal
digit
The equation can be written as:
-12
Vout = Mantissa x 2
For example, considering set Vout to 12V by
VOUT_COMMAND, the read/write data can be
calculated refer to below process:
-12
-12
1. Mantissa =Vout/2 = 12/2 =49152;
2. Converter the calculated Mantissa to hexadecimal
0xC000.
For commands that set or report all other thresholds,
including input voltages, output current, temperature,
time and frequency, the supported linear data format is a
two byte value with: an 11 bit, two’s complement
mantissa , and a 5 bit, two’s complement exponent
(scaling factor).The format of the two data bytes is
shown as in below.
Resistor(Koh
m)
0
10
1
15.4
2
23.7
3
36.5
4
54.9
5
84.5
6
130
7
200
PMBus Data Format
The module receives and report date in LINEAR
format. The Exponent of the data words is fixed at a
reasonable value for the command; altering the
exponent is not supported. DIRECT format is not
supported by the module.
For commands that set or report any voltage
thresholds related to the output voltage, the module
supports the linear data format consisting of a two byte
value with a 16-bit, unsigned mantissa, and a fixed
exponent of -12. The format of the two data bytes is
shown below:
The equation can be written as:
exponent
Value = Mantissa x 2
For example, considering set the turn on threshold of input
under voltage lockout to 34V by VIN_ON command; the
read/write data can be calculated refer to below process:
1. Get the exponent of Vin, -3; whose binary is 11101
-3
-3
2. Mantissa =Vin/2 =34/2 =272;
3. Converter the calculated Mantissa to hexadecimal
110, then converter to binary 00100010000;
4. Combine the exponent and the mantissa, 11101 and
00100010000;
5. Converter
binary
1110100100010000
to
hexadecimal E910.
The detail exponent and resolution of main parameter is
summarized as below:
Exponent Resolution
Vin
-3
0.125V
Vo
-12
0.244mV
Io
-4
62.5mA
Temperature
-2
/
Switching requency
-2
0.25Khz
Time
-1
0.5ms
Supported PMBus Commands
The main PMBus commands described in the PMBus 1.2
specification are supported by the module. Partial PMBus
commands are fully supported; Partial PMBus commands
have difference with the definition in PMBus 1.2
specification. All the supported PMBus commands are
detail summarized in below table.
DS_Q48SG12034_08062014
12
FEATURES DESCRIPTIONS (CON.)
Compatible
with
Comman
Transf
Command
Command description
d Code
Data
standard
-er type
Range Data Expon
Default value
Format
Note
limit
units
-ent
/
/
/
/
/
/
/
/
/
/
/
/
PMBUS or
not?
Refer to
OPERATION
Turn the module on or off by
R/W
PMBUS command
byte
0x01
below
Bit field
0x80
description;
0x1D
Configures the combination of
Refer to
R/W
ON_OFF_CONFIG
0x02
primary on/off pin and PMBUS
(Neg Logic);
below
Bit field
byte
command
0x1F
description;
(Pos Logic);
CLEAR_FAULTS
Clear any fault bits that have
Send
been set
byte
Stores operating parameters
Send
from RAM to data flash
byte
0x03
Yes
/
/
This command is effective to the
STORE_DEFAULT_ALL
0x11
Yes
/
/
/
/
/
parameter of all command in the
table.
Restores operating parameters
RESTORE_DEFAULT_ALL
Send
0x12
This command can't be issued
Yes
from data flash to RAM
0x20
To read Vo data format
/
/
mode+
Yes
Set the output voltage
0x14
/
/
/
/
Volts
-12
/
KHz
-2
/
exp
R/W
0x21
/
when the power unit is running.
byte
VOUT_COMMAND
/
byte
Read
VOUT_MODE
/
Vout
Yes
word
9.6
11.8
Linear
~13.2
Freque
R/W
FREQUENCY_SWITCH
0x33
Set the switching frequency
120
Yes
ncy
130
word
~140
Linear
VIN_ON should be higher than
VIN_ON
Set the turn on voltage threshold
R/W
of Vin under voltage lockout
word
0x35
Vin
Yes
34
32~46
V
-3
VIN_OFF, and keep 2V
Linear
hystersis.
VIN_ON should be higher than
VIN_OFF
Set the turn off voltage threshold
R/W
of Vin under voltage lockout
word
0x36
Vin
Yes
32
32~46
V
-3
VIN_OFF, and keep 2V
Linear
hystersis.
Must be higher than the value of
VOUT_OV_FAULT_LIMIT
Set the output overvoltage fault
R/W
threshold.
word
0x40
Vout
Yes
15
11~16
V
-12
VOUT_COMMAND
and
Linear
VOUT_OV_WARN_LIMIT;
DS_Q48SG12034_08062014
13
Compatible
with
Comman
Transf
Command
Command description
d Code
Data
standard
-er type
Range Data Expon
Default value
Format
Note
limit
units
-ent
0xB8
/
N/A
/
15
11~16
V
-12
PMBUS or
not?
Instructs what action to take in
VOUT_OV_FAULT_RESP
Refer to
R/W
0x41
response to an output
ONSE
below
overvoltage fault.
Set a threshold causing an
VOUT_OV_WARN_LIMIT
IOUT_OC_FAULT_LIMIT
R/W
Vout
Yes
output voltage high warning.
word
Set the output overcurrent fault
R/W
0x46
VOUT_OV_FAULT_LIMIT value
Iout
word
Instructs what action to take in
Must be less than
Linear
Yes
IOUT_OC_FAULT_RESPO
Must be greater than
43
20~60
A
-4
Linear
IOUT_OC_WARN_LIMIT value
Refer to
R/W
0x47
response to an output
NSE
below
Bit field
0xF8
/
N/A
/
36
10~40
A
-4
/
byte
overcurrent fault.
Set a threshold causing an
OT_FAULT_LIMIT
/
description;
0x42
threshold.
IOUT_OC_WARN_LIMIT
Bit field
byte
description;
R/W
0x4A
Iout
Yes
output current high warning.
word
Set the over temperature fault
R/W
0x4F
Linear
word
Instructs what action to take in
IOUT_OC_FAULT_LIMIT value
TEMP
Yes
threshold.
Must be less than
Deg.
125
25~140
Linear
Must be greater than
-2
C
OT_WARN_LIMIT value
Refer to
R/W
OT_FAULT_RESPONSE
0x50
response to an over temperature
below
Bit field
0xB8
/
115
25~125
N/A
/
/
byte
fault.
Set a threshold causing a
OT_WARN_LIMIT
VIN_OV_FAULT_LIMIT
description;
R/W
0x51
TEMP
Yes
temperature high warning.
word
Set the input overvoltage fault
R/W
0x55
Linear
Must be less than
-2
C
OT_FAULT_LIMIT value
Vin
Yes
threshold.
Deg.
110
word
Linear
R/W
Vout
48~110
V
-3
Sets the output voltage at which
POWER_GOOD_ON
0x5E
Must be greater than
the bit 3 of STATUS_WORD
Yes
word
8.1
11
Linear
V
-12
1.6V
Sets the output voltage at which
Must be less than
R/W
0x5F
POWER_GOOD_OFF value by
~13.2
high byte should be asserted.
POWER_GOOD_OFF
/
the bit 3 of STATUS_WORD
Vout
Yes
word
8.1
9
Linear
V
-12
POWER_GOOD_ON value by
~13.2
high byte should be negated.
1.6V
Sets the time from a start
R/W
TON_DELAY
0x60
condition is received until the
Time
Yes
word
7
5~500
ms
-1
/
Linear
output voltage starts to rise
DS_Q48SG12034_08062014
14
Compatible
with
Comman
Transf
Command
Command description
d Code
Data
standard
-er type
Range Data Expon
Default value
Format
Note
limit
units
-ent
28
15~500
ms
-1
/
Bit field
/
/
/
/
/
Bit field
/
/
/
/
/
Bit field
/
/
/
/
/
Bit field
/
/
/
/
/
Bit field
/
/
/
/
/
Bit field
/
/
/
/
/
/
/
Volts
/
/
/
/
Volts
/
/
/
/
Amps
/
/
/
/
/
/
/
/
PMBUS or
not?
Sets the time from the output
R/W
TON_RISE
0x61
starts to rise until the voltage has
Time
Yes
word
Linear
entered the regulation band.
Returns the information with a
Refer to
Read
STATUS_WORD
0x79
summary of the module's
below
word
fault/warning
description;
Returns the information of the
Refer to
Read
STATUS_VOUT
0x7A
module's output voltage related
below
byte
fault/warning
description;
Returns the information of the
Refer to
Read
STATUS_IOUT
0x7B
module's output current related
below
byte
fault/warning
description;
Returns the information of the
Refer to
Read
STATUS_INPUT
0x7C
module's input over voltage and
below
byte
under voltage fault
description;
Returns the information of the
Refer to
Read
STATUS_TEMPERATURE
0x7D
module's temperature related
below
byte
fault/warning
description;
Returns the information of the
Refer to
Read
STATUS_CML
0x7E
module's communication related
below
byte
faults.
Returns the input voltage of the
READ_VIN
READ_VOUT
READ_IOUT
READ_TEMPERATURE_1
description;
Read
0x88
Vin
Yes
module
word
Returns the output voltage of the
Read
0x8B
Linear
Vout
Yes
module
word
Returns the output current of the
Read
0x8C
Linear
Iout
Yes
module
word
Returns the module's hot spot
Read
0x8D
Linear
TEMP
Yes
temperature of the module
word
Deg.
Linear
C
Read
PMBUS_REVISION
0x98
Reads the revision of the PMBus
Yes
Bit field
1.2
/
/
byte
DS_Q48SG12034_08062014
15
Compatible
with
Comman
Transf
Command
Command description
d Code
Data
standard
-er type
Range Data Expon
Default value
Format
Note
limit
units
-ent
/
/
/
PMBUS or
not?
Configures the C2 pin
Refer to
R/W
MFR_ C2_Configure
0xE1
(secondary on/off pin) function
below
Bit field
0x00
/
byte
and logic;
DS_Q48SG12034_08062014
description;
16
FEATURES DESCRIPTIONS (CON.)
OPERATION [0x01]
Bit number
7:
6:0
Purpose
Enable/Disable the module
Bit Value
Meaning
1
Output is enabled
0
Output is disabled
Default Settings，
0x80
1
Reserved
0000000
ON_OFF_CONFIG [0x02]
Bit number
7:5
4
Purpose
Bit Value
Meaning
Reserved
Default Settings，
0x1D (negative)
/0x1F (positive)
000
Controls how the unit responds to
1
the primary on/off pin and the
OPERATION command;
Module does not power up until commanded by
1
the primary ON/OFF pin and the OPERATION
0
Module power up at any time regardless of the
state of the primary ON/OFF pin and the
OPERATION
3
2
Controls how the unit responds to
1
Module responds to the 7 bit in the OPERATION
the OPERATION command
0
Module ignores the 7 bit in the OPERATION
Controls how the unit
responds to the primary on/off pin
1
0
1
0
Control logic of primay on/off pin
Unit turn off delay time control
Module requires the primary ON/OFF pin to be
1
1
asserted to start the unit
Module ignores the state of the primary ON/OFF
pin
0, negative;
1
Positive Logic
0
Negative Logic
1
Shut down the module with 0 delay cycle
1, positive.
1
VOUT_OV_FAULT_RESPONSE [0x41]
Bit number
7:6
Purpose
Response settings
Bit Value
Meaning
Default Settings，
0xB8
10
Unit shuts down and responds according to the
10
retry settings
5:3
Retry setting
111
Unit continuously restarts while fault is present
111
until commanded off
2:0
Delay time setting
000
Unit does not attempt to restart on fault
000
No delay supported
000
IOUT_OC_FAULT_RESPONSE [0x47]
Bit number
7:6
Purpose
Response settings
Bit Value
11
Meaning
Unit shuts down and responds according to the
Default Settings，
0xF8
11,
retry settings
5:3
Retry settings
111
Unit continuously restarts while fault is present
111
until commanded off
2:0
Delay time setting
DS_Q48SG12034_08062014
000
Unit does not attempt to restart on fault
000
No delay supported
000
17
FEATURES DESCRIPTIONS (CON.)
OT_FAULT_RESPONSE [0x50]
Bit number
7:6
Purpose
Bit Value
Response settings
10
Default Settings，
Meaning
0xB8
Unit shuts down and responds according to the
10,
retry settings
5:3
Retry settings
111
Unit continuously restarts while fault is present
111
until commanded off
2:0
Delay time setting
000
Unit does not attempt to restart on fault
000
No delay supported
000
STATUS_WORD [0x79]
High byte
Bit number
7
6
5
Purpose
An output over voltage fault or warning
An output over current fault or warning
An input voltage fault, including over voltage and undervoltage
4
Reserved
3
Power_Good
2:0
Bit Value
Meaning
1
Occurred
0
No Occurred
1
Occurred
0
No Occurred
1
Occurred
0
No Occurred
1
is negated
0
ok
Reserved
Low byte
Bit number
Purpose
7
Reserved
6
OFF (The unit is not providing power to the output, regardless of the
reason)
5
4
3
2
1
0
An output over voltage fault
An output over current fault
An input under voltage fault
A temperature fault or warning
CML (A communications, memory or logic fault）
Bit Value
Meaning
1
Occurred
0
No Occurred
1
Occurred
0
No Occurred
1
Occurred
0
No Occurred
1
Occurred
0
No Occurred
1
Occurred
0
No Occurred
1
Occurred；
0
No Occurred
Reserved
DS_Q48SG12034_08062014
18
FEATURES DESCRIPTIONS (CON.)
STATUS_VOUT [0x7A]
Bit number
7
6
5:0
Purpose
Output over voltage fault
Output over voltage warning
Bit Value
Meaning
1
Occurred；
0
No Occurred
1
Occurred；
0
No Occurred
Reserved
STATUS_IOUT [0x7B]
Bit number
7
Purpose
Output over current fault
6
Reserved
5
Output over current warning
4:0
Bit Value
Meaning
1
Occurred；
0
No Occurred
1
Occurred；
0
No Occurred
Reserved
STATUS_INPUT [0x7C]
Bit number
7
6: 5
4
3:0
Purpose
Input over voltage fault
Bit Value
Meaning
1
Occurred；
0
No Occurred
1
Occurred；
0
No Occurred
Reserved
Input under voltage fault
Reserved
STATUS_TEMPERATURE [0x7D]
Bit number
7
6
5:0
Purpose
Over temperature fault
Over temperature warning
Bit Value
Meaning
1
Occurred；
0
No Occurred
1
Occurred；
0
No Occurred
Reserved
DS_Q48SG12034_08062014
19
FEATURES DESCRIPTIONS (CON.)
STATUS_CML [0x7E]
Bit number
7
6
5
4:0
Purpose
Bit Value
Invalid/Unsupported Command Received
Invalid/Unsupported Data Received
Packet Error Check Failed
Meaning
1
Occurred；
0
No Occurred
1
Occurred；
0
No Occurred
1
Occurred；
0
No Occurred
Reserved
MFR_ C2_Configure [0xE1]
Bit
Purpose
Bit Value
Meaning
number
7:2
1
0
Default Settings，
0x00
Reserved
000000
Secondary ON/OFF
1
AND – Primary and Secondary side on/off
Configuration
0
C2 is ignored
Secondary side on/off
1
Positive Logic
Logic
0
Negative Logic
DS_Q48SG12034_08062014
0
0
20
FEATURES DESCRIPTIONS (CON.)
THERMAL CONSIDERATIONS
Output Voltage Adjustment (TRIM)
Thermal management is an important part of the system
design. To ensure proper, reliable operation, sufficient
cooling of the power module is needed over the entire
temperature range of the module. Convection cooling is
usually the dominant mode of heat transfer.
To increase or decrease the output voltage set point,
connect an external resistor between the TRIM pin and
either the Vo(+) or Vo(-). The TRIM pin should be left
open if this feature is not used. Below Trim equation is
only adapt to the module without droop current sharing
option code; For the module with droop current sharing
option code, please contact Delta’s technical support
team.
Hence, the choice of equipment to characterize the
thermal performance of the power module is a wind
tunnel.
Thermal Testing Setup
Figure 19: Circuit configuration for trim-down (decrease
output voltage)
If the external resistor is connected between the TRIM
and Vo (-) pins, the output voltage set point decreases
(Fig. 19). The external resistor value required to obtain
a percentage of output voltage change △% is defined
as:
 511

Rtrim  down  
 10.2K


Ex. When Trim-down -10% (12V×0.9=10.8V)
Delta’s DC/DC power modules are characterized in
heated vertical wind tunnels that simulate the thermal
environments encountered in most electronics
equipment. This type of equipment commonly uses
vertically mounted circuit cards in cabinet racks in which
the power modules are mounted.
The following figure shows the wind tunnel
characterization setup. The power module is mounted
on a test PWB and is vertically positioned within the wind
tunnel. The space between the neighboring PWB and
the top of the power module is constantly kept at
6.35mm (0.25’’).
PWB
FANCING PWB
 511

Rtrim  down  
 10.2 K  40.9K
 10

MODULE
50.8(2.00")
AIR VELOCITY
AND AMBIENT
TEMPERATURE
SURED BELOW
THE MODULE
AIR FLOW
Figure 20: Circuit configuration for trim-up (increase output
voltage)
If the external resistor is connected between the TRIM
and Vo (+) the output voltage set point increases (Fig.
20). The external resistor value required to obtain a
percentage output voltage change △% is defined as:
Rtrim  up 
5.11Vo (100   ) 511

 10.2K
1.225

Ex. When Trim-up +10% (11.8V×1.1=12.98V)
Rtrim  up 
5.11 11.8  (100  10) 511

 10.2  480.2K
1.225  10
10
Care should be taken to ensure that the maximum
output power of the module remains at or below the
maximum rated power.
DS_Q48SG12034_08062014
Note: Wind Tunnel Test Setup Figure Dimensions are in millimeters and (Inches)
Figure 21: Wind tunnel test setup
Thermal Derating
Heat can be removed by increasing airflow over the
module.
To enhance system reliability; the power
module should always be operated below the maximum
operating temperature. If the temperature exceeds the
maximum module temperature, reliability of the unit may
be affected.
21
THERMAL CURVES
(WITH HEAT SPREADER)
THERMAL CURVES
(WITHOUT HEAT SPREADER)
AIRFLOW
NTC RESISTOR
AIRFLOW
HOT SPOT 1
Figure 22: * Hot spot 1& NTC resistor temperature measured
points. the allowed maximum hot spot 1 temperature is defined
at 118℃
HOT SPOT 2
Figure 24: * Hot spot 2 temperature measured point. The allowed
maximum hot spot 2 temperature is defined at 105℃
Output Current(A)
35
Q48SG12034(Standard) Output Current vs. Ambient Temperature and Air Velocity
Output Current(A)
@Vin = 48V (Transverse Orientation)
Q48SG12034(Standard) Output Current vs. Ambient Temperature and Air Velocity
@Vin = 48V (Transverse Orientation,With Heat Spreader)
600LFM
35
600LFM
30
500LFM
30
500LFM
25
Natural
Convection
25
20
Natural
Convection
20
100LFM
15
200LFM
100LFM
15
200LFM
300LFM
10
10
300LFM
5
400LFM
5
400LFM
0
25
0
25
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 23: Output current vs. ambient temperature and air
velocity @Vin=48V(Transverse Orientation, airflow from Vin+ to
Vin-, without heat spreader)
DS_Q48SG12034_08062014
30
35
40
45
50
55
60
65
70
75
80
85
Ambient Temperature (℃)
Figure 25: Output current vs. ambient temperature and air velocity
@Vin=48V(Transverse Orientation, airflow from Vin+ to Vin-,with
heat spreader)
22
MECHANICAL DRAWING (WITH HEAT SPREADER)
*For modules with through-hole pins and the optional heat spreader, they are intended for wave soldering assembly
onto system boards, please do not subject such modules through reflow temperature profile.
DS_Q48SG12034_08062014
23
MECHANICAL DRAWING (WITHOUT HEAT SPREADER)
DS_Q48SG12034_08062014
24
Pin Specification:
Pins 1-3&5
Pins 4 &6
Pins 7-13
1.00mm (0.040”) diameter (All pins are copper with matte Tin plating over Nickel under plating)
2. 1.50mm (0.059”) diameter (All pins are copper with matte Tin plating over Nickel under plating)
1. SQ 0.50mm(0.020’’) ( All pins are copper with gold flash plating)
DS_Q48SG12034_08062014
25
PART NUMBERING SYSTEM
Q
48
Type of Input
Product Voltage
S
G
120
34
N
R
F
A
Number
Product Output Output ON/OFF Pin Length
of
Series Voltage Current Logic
/Type
Outputs
Option Code
Droop
Current
Sharing
QQuarter
Brick
48S- Single
38~75V
G – Full
digital
control
120 –
11.8V
34 - 34A
NNegative
PPositive
K – 0.110’’
N - 0.145”
R - 0.170”
F- RoHS
6/6
(Lead
Free)
Trim pin
PMBus Heat
pin
spreader
A
Yes
Yes, but no
function
Yes
No
B
No
Yes
No
No
C
No
Yes
No
Yes
D
No
No
No
Yes
G
No
Yes
Yes
Yes
H
Yes
Yes, but no
function
Yes
Yes
J
No
No
No
No
MODEL LIST
MODEL NAME
INPUT
OUTPUT
EFF @ 100% LOAD
Q48SG12034NRFA
38V~75V
12.5A
11.8V
34A
95.5%
Q48SG12034NRFB
38V~75V
12.5A
11.8V
34A
95.5%
Q48SG12034NRFC
38V~75V
12.5A
11.8V
34A
95.5%
Q48SG12034NRFD
38V~75V
12.5A
11.8V
34A
95.5%
Q48SG12034NRFH
38V~75V
12.5A
11.8V
34A
95.5%
Q48SG12034NRFG
38V~75V
12.5A
11.8V
34A
95.5%
Default remote on/off logic is negative and pin length is 0.170”
For different remote on/off logic and pin length, please refer to part numbering system above or contact your local sales
office.
CONTACT: www.deltaww.com/dcdc
USA:
Telephone:
East Coast: 978-656-3993
West Coast: 510-668-5100
Fax: (978) 656 3964
Email: [email protected]
Europe:
Telephone: +31-20-655-0967
Fax: +31-20-655-0999
Email: [email protected]
Asia & the rest of world:
Telephone: +886 3 4526107 x 6220~6224
Fax: +886 3 4513485
Email: [email protected]
WARRANTY
Delta offers a two (2) year limited warranty. Complete warranty information is listed on our web site or is available upon
request from Delta.
Information furnished by Delta is believed to be accurate and reliable. However, no responsibility is assumed by Delta for
its use, nor for any infringements of patents or other rights of third parties, which may result from its use. No license is
granted by implication or otherwise under any patent or patent rights of Delta. Delta reserves the right to revise these
specifications at any time, without notice.
DS_Q48SG12034_08062014
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