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PDF TD7590 Data sheet ( Hoja de datos )
| Número de pieza | TD7590 | |
| Descripción | 5A 240KHZ 36V PWM Buck DC/DC Converter | |
| Fabricantes | Techcode | |
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5A 240KHZ 36V PWM Buck DC/DC Converter
Datasheet
TD7590
General Description
The TD7590 is a 240 KHz fixed frequency
monolithic step down switch mode regulator
with a built in internal Power MOSFET. It
achieves 5A continuous output current over a
wide input supply range with excellent load
and line regulation.
The device includes a voltage reference,
oscillation circuit, error amplifier, internal
PMOS and etc.
The PWM control circuit is able to adjust the
duty ratio linearly from 0 to 100%. An enable
function, an over current protection function
and a short circuit protection function are
built inside. An internal compensation block
is built in to minimize external component
count.
The TD7590 serves as ideal power supply
units for portable devices.
Features
5A Constant Output Current
80mΩ RDSON
Switch
Internal
Power
PMOSTFOE2T63-5L
Up to 95% Efficiency
Fixed 240KHz Frequency
Wide 3.6V to 36V Input Voltage Range
Output Adjustable from 1.222V to 34V
Built in Frequency Compensation
Built in Thermal Shutdown Function
Built in Current Limit Function
TO-263 Package is Available
The minimum dropout up to 0.3V
Applications
Portable DVD
LCD Monitor / TV
Battery Charger
ADSL Modem
Telecom / Networking Equipment
Figure 1 Package Type of TD7590
September, 2006
Techcode Semiconductor Limited
1
1 page  
5A 240KHZ 36V PWM Buck DC/DC Converter
Typical Performance Characteristics
Datasheet
TD7590
Figure 4. Switching Frequency vs. Temperature
Figure 5. Vfb vs. Temperature
Figure 6. Icc vs. Temperature
Figure 7. Efficiency vs. Load (Vin=10V)
September, 2006
Techcode Semiconductor Limited
5
5 Page 
Datasheet
5A 240KHZ 36V PWM Buck DC/DC Converter
TD7590
loop starts from the input capacitors, to the VIN
pin, to the VOUT pins, to the filter inductor, to the
output capacitor and load, and then returns to the
input capacitor through ground.
Current flows in the first loop when the high side
switch is on. The second loop starts from the
inductor, to the output capacitors and load, to the
GND pin of the TD7590, and to the VOUT pins of
the TD7590. Current flows in the second loop
when the low side diode is on.
In PCB layout, minimizing the two loops area
reduces the noise of this circuit and improves
efficiency. A ground plane is recommended to
connect input capacitor, output capacitor, and
GND pin of the TD7590.
In the TD7590 buck regulator circuit, the two
major power dissipating components are the
TD7590 and output inductor. The total power
dissipation of converter circuit can be measured
by input power minus output power.
Ptotal _loss = V IN × IIN – V O × IO
The power dissipation of inductor can be
approximately calculated by output current and
DCR of inductor.
Pinductor _loss= IO 2 × Rinductor × 1.1
The junction to ambient temperature can be got
from power dissipation in the TD7590 and thermal
impedance from junction to ambient.
T (jun-amb) =(Ptotalloss–Pinductorloss)× ΘJA
The maximum junction temperature of TD7590 is
145°C, which limits the maximum load current
capability. Please see the thermal de-rating
curves for the maximum load current of the
TD7590 under different ambient temperatures.
The thermal performance of the TD7590 is trongly
affected by the PCB layout. Extra care should be
taken by users during the design process to nsure
that the IC will operate under the recommended
environmental conditions.
Several layout tips are listed below for the best
electric and thermal performance.
1. Do not use thermal relief connection to the VIN
and the GND pin. Pour a maximized copper area
to the GND pin and the VIN pin to help thermal
dissipation.
2. Input capacitor should be connected to the VIN
pin and the GND pin as close as possible.
3. Make the current trace from VOUT pins to L to
the GND as short as possible.
4. Pour copper plane on all unused board area
and connect it to stable DC nodes, like VIN, GND,
or VOUT.
5. Keep sensitive signal traces such as trace
connecting FB pin away from the VOUT pins.
September, 2006
Techcode Semiconductor Limited
11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet TD7590.PDF ] | |
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