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PDF MAX5069A Data sheet ( Hoja de datos )
| Número de pieza | MAX5069A | |
| Descripción | MAX5069A Evaluation Kit | |
| Fabricantes | Maxim Integrated | |
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19-3513; Rev 0; 11/04
MAX5069A Evaluation Kit
General Description
The MAX5069A evaluation kit (EV kit) is a fully assembled
and tested circuit board that contains a high-efficiency,
120W isolated push-pull DC-DC converter. The circuit is
configured for a +12V output voltage and provides up to
10A of output current. The circuit can be powered from
either a +36V to +72V or -36V to -72V DC source, as used
in the telecom/datacom markets, industrial environments,
or in automotive 42V power systems.
High efficiency up to 91% is achieved at 10A while using
two n-channel primary-side MOSFETs switching at up to
90% combined duty cycle. On the secondary-side,
reduced output-voltage ripple and high efficiency is
achieved through full-wave rectification from a center-
tapped planar transformer. Galvanic isolation up to 500V
is achieved by an optocoupler and the planar surface-
mount transformer. The optocoupler helps in providing
isolated secondary-side regulation.
Operation at 500kHz allows the use of small magnetics
and output capacitors. A SYNC input is featured to ease
synchronization to an external clock. The EV kit provides
cycle-by-cycle current-limit protection. Additional steady-
state fault protection is provided by the integrating fault
protection that reduces average dissipated power during
continuous overload conditions. The MAX5069A also has
a programmable input undervoltage lockout (UVLO) for
protection during brownout conditions. The EV kit may be
used to evaluate other versions of the MAX5069.
Warning: The MAX5069A EV kit is designed to operate
with high voltages. Dangerous voltages are present on
this EV kit and on equipment connected to it. Users who
power up this EV kit or power the sources connected to it
must be careful to follow safety procedures appropriate to
working with high-voltage electrical equipment.
Under severe fault or failure conditions, this EV kit may
dissipate large amounts of power, which could result in
the mechanical ejection of a component or of component
debris at high velocity. Operate this kit with care to avoid
possible personal injury.
Features
♦ 120W High-Efficiency, Isolated, Push-Pull DC-DC
Converter
♦ ±36V to ±72V Input Range
♦ +12V Output at 10A
♦ VOUT Regulation Better than 0.1% Over Line and
Load
♦ 91% Efficiency at 48V and 10A
♦ Programmable Input UVLO
♦ Cycle-by-Cycle Current-Limit Protection
♦ Programmable Integrating Fault Protection
♦ 500kHz Oscillator Frequency
♦ External Clock SYNC Input
♦ Fully Assembled and Tested
Ordering Information
PART
MAX5069AEVKIT
*With 200LFM airflow.
TEMP RANGE
0°C to +50°C*
IC PACKAGE
16 TSSOP
Component List
DESIGNATION QTY
DESCRIPTION
0.1µF ±10%, 16V X7R ceramic
C1 1 capacitor (0603)
Murata GRM39X7R104K016AD
C2, C3, C4
1µF ±10%, 100V X7R ceramic
3 capacitors (1210)
AVX 1210C105KAT9A
C5, C6, C7,
C18, C19, C20
47µF ±10%, 16V X5R ceramic
6 capacitors (1210)
Murata GRM32ER61C476K
0.1µF ±10%, 50V X7R ceramic
C8 1 capacitor (0603)
Murata GRM188R71H104K
10µF ±20%, 35V, low-impedance
C9 1 electrolytic capacitor (5mm x 6mm)
Sanyo 35CV10KX
12pF ±5%, 50V C0G ceramic
C10 1 capacitor (0603)
Murata GRM1885C1H120J
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
MAX5069A Evaluation Kit
( )RCS
=
VSENSE
NS
NP
×
1.2 × IOUTMAX
where RCS = parallel combination of R14 and R15,
VSENSE = 0.314V, NS = 2, NP = 5, and IOUTMAX = max-
imum DC output current (10A or less). Note that some
fine-tuning may be required when selecting the current-
limit resistors. Errors are introduced as a result of the
MAX5069A IC current-limit propagation delays.
Input Undervoltage Lockout (UVLO)
The MAX5069A EV kit features a brownout and input-
supply startup UVLO circuit that prevents operation
below the programmed input-supply start voltage.
Resistors R5 and R6 set the input undervoltage lockout
threshold of the EV kit. To evaluate other input UVLO
voltages, replace resistor R5 with another surface-mount
resistor (0805 size). Using the desired startup voltage,
resistor R5 is then found by the following equation:
R5
=
VINSTARTUP
1.231V
− 1
×
R6
where VINSTARTUP is the desired startup voltage at which
the EV kit starts and resistor R6 is typically in the 20kΩ
range. Refer to the MAX5069A/D UVLO Adjustment and
Bootstrap Undervoltage Lockout sections of the
MAX5069 data sheet for additional information on the
UVLO/EN pin of the MAX5069A IC.
Push-Pull DC-DC Converter
N1 DRAIN VOLTAGE
0V
N2 DRAIN VOLTAGE
0V
1µs/div
Figure 1. MOSFETs N1 and N2 Drain-Source Voltage Waveforms
(50V per Division, 1µs per Division)
_______________________________________________________________________________________ 5
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| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet MAX5069A.PDF ] | |
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