Datasheet

ManualsBrandsDELTA ELECTRONICS ManualsPSU ComponentsDC/DC converter (print) 3.3 Vdc 7.5 A 25 W No. of outputs: 1 x

DATASHEET

DS_T48SR3R307_10162012

APPLICATIONS

 Telecom / Datacom

 Wireless Networks

 Optical Network Equipment

 Server and Data Storage

 Industrial / Testing Equipment

OPTIONS

 Latched over voltage protection

 Positive On/Off logic

FEATURES

 High efficiency : 86% @ 3.3V/7.5A

 Size:

19.1mmx23.4mmx8.9mm (0.92”x0.75”x0.35”)

 Standard footprint

 Fixed frequency operation

 Hiccup output over current protection (OCP)

 Hiccup output over voltage protection (OVP)

 Auto recovery OTP

 Input UVLO

 Output voltage trim:-20%,+10%

 Pre-biased loads

 1500V isolation and basic insulation

 No minimum load required

 ISO 9001, TL 9000, ISO 14001, QS9000,

OHSAS18001 certified manufacturing facility

 UL/cUL 60950-1 (US & Canada) recognized

Delphi Series T48SR, 1/32 Brick Family

DC/DC Power Modules:

36~75V in, 3.3V/7.5A out, 24.75W

The Delphi series T48SR3R307, 1/32 brick, 36V~75V input, single

output, isolated DC/DC converter is the latest offering from a world leader

in power system and technology and manufacturing ― Delta Electronics,

Inc. This product provides up to 24.75 watts of power in an industry

standard footprint and pin out. With creative design technology and

optimization of component placement, these converters possess

outstanding electrical and thermal performances, as well as extremely

high reliability under highly stressful operating conditions.

The

T48SR3R307 offers more than 86% high efficiency at 7.5A full load.

Summary of content (12 pages)

PAGE 1
FEATURES High efficiency : 86% @ 3.3V/7.5A Size: 19.1mmx23.4mmx8.9mm (0.92”x0.75”x0.
PAGE 2
TECHNICAL SPECIFICATIONS (TA=25°C, airflow rate=300 LFM, Vin=48Vdc, nominal Vout unless otherwise noted; PARAMETER NOTES and CONDITIONS T48SR3R307 (Standard) Min.
PAGE 3
ELECTRICAL CHARACTERISTICS CURVES 90 85 4.000 POWER DISSIPATION(W) EFFICIENCY(%) 80 75 36Vin 70 48Vin 65 60 72Vin 3.000 2.000 72Vin 55 50 0.75 36Vin 48Vin 1.000 1.5 2.25 3 3.75 4.5 5.25 6 6.75 7.5 0.75 1.5 2.25 3 3.75 4.5 5.25 6 6.75 7.5 OUTPUT CURRENT(A) OUTPUT CURRENT(A) Figure 1: Efficiency vs. load current for minimum, nominal, and maximum input voltage. Figure 2: Power dissipation vs. load current for minimum, nominal, and maximum input voltage. 1 0.
PAGE 4
ELECTRICAL CHARACTERISTICS CURVES For Negative Remote On/Off Logic Figure 4: Turn-on transient at zero load current) (4ms/div). Top Trace: Vout; 1.5V/div; Bottom Trace: ON/OFF input: 5V/div. Figure 5: Turn-on transient at full rated load current (4 ms/div). Top Trace: Vout: 1.5V/div; Bottom Trace: ON/OFF input: 5V/div. For Input Voltage Start up Figure 6: Turn-on transient at zero load current (10 ms/div). Top Trace: Vout; 1.5V/div; Bottom Trace: input voltage: 30V/div.
PAGE 5
ELECTRICAL CHARACTERISTICS CURVES Figure 8: Output voltage response to step-change in load current (75%-50% of Io, max; di/dt =1A/µs). Load cap: 400µF, ceramic capacitor. Top Trace: Vout (100mV/div,200us/div); Bottom Trace: output current(1.5A/div, 200us/div) Figure 9: Output voltage response to step-change in load current (50%-75% of Io, max; di/dt =1A/µs). Load cap: 400µF ceramic capacitor. Top Trace: Vout (100mV/div,200us/div); Bottom Trace: output current(1.
PAGE 6
ELECTRICAL CHARACTERISTICS CURVES Figure 12: Input reflected ripple current, is, through a 12µH source inductor at nominal input voltage and rated load current (25 mA/div，2us/div), Setup is shown in Figure 10 top picture. Figure 13: Output voltage noise and ripple measurement test setup. Output Voltage (V) 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10 Output Current (A) Figure 14: Output voltage ripple at nominal input voltage and rated load current (Io=7.
PAGE 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 100µF electrolytic capacitor mounted close to the input of the module to improve the stability.
PAGE 8
FEATURES DESCRIPTIONS 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. output terminals.
PAGE 9
FEATURES DESCRIPTIONS (CON.) This limit includes any increase in voltage due to remote sense compensation and output voltage set point adjustment (trim). If the external resistor is connected between the TRIM and SENSE (-) pins, the output voltage set point decreases (Fig.18). The external resistor value required to obtain a percentage of output voltage change △% is defined as: Rtrim − down = Vi(+) Vo(+) Ex. When Trim-down -20 %( 3.3V×0.8=2.
PAGE 10
THERMAL CONSIDERATIONS THERMAL CURVES 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. A IR FL OW Hence, the choice of equipment to characterize the thermal performance of the power module is a wind tunnel.
PAGE 11
MECHANICAL DRAWING Note: All pins are copper alloy with matte Tin over Ni plating .
PAGE 12
PART NUMBERING SYSTEM T 48 Form Input Factor Voltage Outputs Series 48-36V~75V S - Single R- Series T – 1/32 S R Number of Product Brick Number 3R3 07 N N Output Output ON/OFF Pin Voltage Current Logic Length 3R3 – 07 – 7.5A N - Negative N - 0.146” 3.3V P - Positive F A Option Code R - 0.170” F - RoHS 6/6 A - Std. Functions (Lead Free) Space - RoHS5/6 MODEL LIST MODEL NAME INPUT OUTPUT EFF @ 100% LOAD T48SR3R307NNFA 36V~75V 1A 3.3V 7.