MDC_LSN-10A D12_A02 Page 3 of 12
P O W E R E L E C T R O N I C S D I V I S I O N
D C / D C C O N V E R T E R S
www.cd4power.comwww.cd4power.com
LSN-10A D12 Models
Single Output, Non-Isolated, 12VIN, 1-5VOUT, 10A, DC/DC's in SIP Packages
Input
Input Voltage Range 10.8-13.2 Volts (12V nominal)
Input Current:
Normal Operating Conditions See Ordering Guide
Inrush Transient 0.08A
2
sec
Standby/Off Mode 8mA
Output Short-Circuit Condition ➁ 40mA average
Input Reflected Ripple Current
➁ 100mAp-p
Input Filter Type Capacitive (66
µF)
Overvoltage Protection None
Reverse-Polarity Protection None
Undervoltage Shutdown None
On/Off Control
➁ ➂ On = open (internal pull-down)
Off = +2.8V to +V
IN (<3mA)
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
Overcurrent Detection and Short-Circuit Protection:
➁
Current-Limiting Detection Point 17 (13-23.5) Amps
Short-Circuit Detection Point 98% of V
OUT set
SC Protection Technique Hiccup with auto recovery
Short-Circuit Current 400mA average
Dynamic Characteristics
Transient Response (50% load step) 100µsec to ±2% of final value
Start-Up Time:
➁
V
IN to VOUT and On/Off to VOUT 70msec for VOUT = 1V
16msec for V
OUT = 1.1V to 5V
Switching Frequency:
1V/1.1V, 1.2V, 1.3 Models 105/125kHz ±10%
1.5V/1.8V, 2V Models 160/177kHz ±10%
2.5V, 3.3V, 5V Models 200kHz ±7.5%
Environmental
Calculated MTBF ➄ 2.3-1.8 million hours (1VOUT to 5VOUT)
Operating Temperature:
(Ambient) ➁
Without Derating (Natural convection) –40 to +48/64°C (model dependent)
With Derating See Derating Curves
Thermal Shutdown +115°C
Physical
Dimensions See Mechanical Specifications
Pin Dimensions/Material 0.03" (0.76mm) round copper alloy with
tin plate over nickel underplate
Weight 0.3 ounces (8.5g)
Flamability Rating UL94V-0
Safety UL/cUL/IEC/EN 60950, CSA-C22.2 No. 234
Performance/Functional Specifications
Typical @ TA = +25°C under nominal line voltage and full-load conditions unless noted. ➀
➀ All models are tested/specified with external 22µF input/output capacitors.These caps
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 appli-
cation 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.
T E C H N I C A L N O T E S
Input Voltage:
Continuous or transient 15 Volts
On/Off Control
(Pin 11) +VIN
Input Reverse-Polarity Protection None
Output Overvoltage Protection
None
Output Current Current limited. Devices can
withstand sustained output short
circuits without damage.
Storage Temperature –40 to +125°C
Lead Temperature (soldering, 10 sec.) +300°C
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.
Absolute Maximum Ratings
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).
I/O Filtering and Noise Reduction
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.
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 22
µF
tantalum output caps has minimal effect on output noise.
In critical applications, input/output ripple/noise may be further reduced using
filtering techniques, the simplest being the installation of external I/O caps.
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.
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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