®
®
A SUBSIDIARY OF C&D TECHNOLOGIES
Single Output
LSN-10A D12 Models
Non-Isolated, 12VIN, 1-5VOUT
10 Amp DC/DC’s in SIP Packages
Features
■
Step-down buck regulators for new
distributed 12V power architectures
■
12V input (10.8-13.2V range)
■
1/1.1/1.2/1.3/1.5/1.8/2/2.5/3.3/5VOUT @10A
■
Non-isolated, fixed-frequency,
synchronous-rectifier topology
■
Outstanding performance:
• ±1.25% setpoint accuracy
• Efficiencies to 96% @ 10 Amps
• Noise as low as 30mVp-p
• Stable no-load operation
• Trimmable output voltage
■
Remote on/off control
■
Sense pin on standard models
■
Thermal shutdown
■
No derating to +68°C with 100 lfm
■
UL/IEC/EN60950 certified
■
EMC compliant
LSN Series D12 SIP's (single-in-line packages) are ideal building blocks for
emerging, on-board power-distribution schemes in which isolated 12V buses deliver
power to any number of non-isolated, step-down buck regulators. LSN D12 DC/DC's
accept a 12V input (10.8V to 13.2V input range) and convert it, with the highest
efficiency in the smallest space, to a 1, 1.1, 1.2, 1.3, 1.5, 1.8, 2, 2.5, 3.3 or 5 Volt
output fully rated at 10 Amps.
LSN D12's are ideal point-of-use/load power processors. They typically require
no external components. Their vertical-mount packages occupy a mere 0.7 square
inches (4.5 sq. cm), and reversed pin vertical mount allows mounting to meet
competitor's keep out area. Horizontal-mount packages ("H" suffix) are only 0.34
inches (8.6mm) high.
The LSN's best-in-class power density is achieved with a fully synchronous,
fixed-frequency, buck topology that also delivers: high efficiency (96% for 5VOUT
models), low noise (30 to 50mVp-p typ.), tight line/load regulation (±0.1%/±0.25%
max.), quick step response (100µsec), stable no-load operation, and no output
reverse conduction.
The fully functional LSN’s feature output overcurrent detection, continuous
short-circuit protection, an output-voltage trim function, a remote on/off control pin
(pull high to disable), thermal shutdown and a sense pin. High efficiency enables
the LSN D12's to deliver rated output currents of 10 Amps at ambient temperatures
to +68°C with 100 lfm air flow.
If your new system boards call for three or more supply voltages, check out the
economics of on-board 12V distributed power. If you don't need to pay for multiple
isolation barriers, DATEL's non-isolated LSN D12 SIP's will save you money.
+OUTPUT
(1,2,4)
+INPUT
(7,8)
10.5Ω
66µF
100µF
330µF
+SENSE ➀
(3)
COMMON
(5)
COMMON
(6)
CURRENT
SENSE
VCC
ON/OFF
CONTROL
(11)
➀ For devices with the sense-pin removed ("B" suffix),
the feedback path is through the +Output pin and not
the +Sense pin.
PWM
CONTROLLER
REFERENCE &
ERROR AMP
VOUT
TRIM
(10)
Figure 1. Simplified Schematic
DATEL, Inc., Mansfield, MA 02048 (USA) · Tel: (508)339-3000, (800)233-2765 Fax: (508)339-6356 · Email: sales@datel.com · Internet: www.datel.com
LSN-10A D12 Models
N O N - I S O L AT E D , 1 0 - 5 0 W S I P D C / D C C O N V E R T E R S
Performance/Functional Specifications
Absolute Maximum Ratings
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
Input Voltage:
Continuous or transient
Input Voltage Range
10.8-13.2 Volts (12V nominal)
Input Current:
Normal Operating Conditions
Inrush Transient
Standby/Off Mode
Output Short-Circuit Condition ➁
15 Volts
On/Off Control (Pin 11)
Input
+VIN
Input Reverse-Polarity Protection
None
Output Overvoltage Protection
None
Output Current
See Ordering Guide
0.08A2sec
8mA
40mA average
Current limited. Devices can
withstand sustained output short
circuits without damage.
Input Reflected Ripple Current ➁
100mAp-p
Input Filter Type
Capacitive (66µF)
Storage Temperature
–40 to +125°C
Overvoltage Protection
None
Lead Temperature (soldering, 10 sec.)
+300°C
Reverse-Polarity Protection
None
Undervoltage Shutdown
None
On/Off Control ➁ ➂
On = open (internal pull-down)
Off = +2.8V to +VIN (<3mA)
These are stress ratings. Exposure of devices to any of these conditions may adversely
affect long-term reliability. Proper operation under conditions other than those listed in the
Performance/Functional Specifications Table is not implied.
Output
VOUT Accuracy (50% load)
±1.25% maximum
Minimum Loading ➀
No load
Maximum Capacitive Load
2000µF (low ESR, OSCON)
VOUT Trim Range ➁
±10%
Ripple/Noise (20MHz BW) ➀ ➁ ➃
See Ordering Guide
Total Accuracy
3% over line/load/temperature
Efficiency ➁
See Ordering Guide
T E C H N I C A L
Return Current Paths
The LSN D12 SIP’s are non-isolated DC/DC converters. Their two Common
pins (pins 5 and 6) are connected to each other internally (see Figure 1). To
the extent possible (with the intent of minimizing ground loops), input return
current should be directed through pin 6 (also referred to as –Input or
Input Return), and output return current should be directed through pin 5
(also referred to as –Output or Output Return). Any on/off control signals
applied to pin 11 (On/Off Control) should be referenced to Common
(specifically pin 6).
Overcurrent Detection and Short-Circuit Protection: ➁
Current-Limiting Detection Point
17 (13-23.5) Amps
Short-Circuit Detection Point
98% of VOUT set
SC Protection Technique
Hiccup with auto recovery
Short-Circuit Current
400mA average
Dynamic Characteristics
Transient Response (50% load step)
Start-Up Time: ➁
VIN to VOUT and On/Off to VOUT
I/O Filtering and Noise Reduction
100µsec to ±2% of final value
All models in the LSN D12 Series are tested and specified with external
22µF tantalum input and output capacitors. These capacitors are necessary
to accommodate our test equipment and may not be required to achieve?
desired performance in your application. The LSN D12's are designed with
high-quality, high-performance internal I/O caps, and will operate within spec
in most applications with no additional external components.
70msec for VOUT = 1V
16msec for VOUT = 1.1V to 5V
Switching Frequency:
1V/1.1V, 1.2V, 1.3 Models
1.5V/1.8V, 2V Models
2.5V, 3.3V, 5V Models
105/125kHz ±10%
160/177kHz ±10%
200kHz ±7.5%
Environmental
Calculated MTBF ➄
–40 to +48/64°C (model dependent)
See Derating Curves
Thermal Shutdown
In particular, the LSN D12's input capacitors are specified for low ESR
and are fully rated to handle the units' input ripple currents. Similarly, the
internal output capacitors are specified for low ESR and full-range frequency
response. As shown in the Performance Curves, removal of the external 22µF
tantalum output caps has minimal effect on output noise.
2.3 -1.8 million hours (1VOUT to 5VOUT)
Operating Temperature: (Ambient) ➁
Without Derating (Natural convection)
With Derating
+115°C
In critical applications, input/output ripple/noise may be further reduced using
filtering techniques, the simplest being the installation of external I/O caps.
Physical
Dimensions
See Mechanical Specifications
Pin Dimensions/Material
0.03" (0.76mm) round copper with
tin-lead plate over nickel underplate
Weight
External input capacitors serve primarily as energy-storage devices. They
minimize high-frequency variations in input voltage (usually caused by IR
drops in conductors leading to the DC/DC) as the switching converter draws
pulses of current. Input capacitors should be selected for bulk capacitance (at
appropriate frequencies), low ESR, and high rms-ripple-current ratings. The
switching nature of modern DC/DC's requires that the dc input voltage
source have low ac impedance at the frequencies of interest. Highly inductive
source impedances can greatly affect system stability. Your specific system
configuration may necessitate additional considerations.
0.3 ounces (8.5g)
Flamability Rating
N O T E S
UL94V-0
➀ All models are tested and specified with external 22µF tantalum input and output capacitors.
These capacitors are necessary to accommodate our test equipment and may not be
required to achieve specified performance in your applications. All models are stable and
regulate within spec under no-load conditions.
➁ See Technical Notes and Performance Curves for details.
➂ The On/Off Control (pin 11) is designed to be driven with open-collector logic or the application of appropriate voltages (referenced to Common, pins 5 and 6).
➃ Output noise may be further reduced with the installation of additional external output
filtering. See I/O Filtering and Noise Reduction.
➄ MTBF’s are calculated using Telcordia SR-332(Bellcore), ground fixed, TA = +25°C, full
power, natural convection, +67°C pcb temperature.
Output ripple/noise (also referred to as periodic and random deviations
or PARD) may be reduced below specified limits with the installation of
additional external output capacitors. Output capacitors function as true filter
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