TD1501 Techcode, TD1501 Datasheet - Page 14

• Manufacturer Part Number: TD1501
• Description: PWM Buck DC/DC Converter
• Manufacturer: Techcode

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Function Description(Cont.)
noise of this circuit and improves efficiency. A ground
plane is recommended to connect input capacitor, output
capacitor, and GND pin of the TD1501.
In the TD1501 buck regulator circuit, the two major
power dissipating components are the TD1501 and
output inductor. The total power dissipation of converter
circuit can be measured by input power minus output
power.
P
The power dissipation of inductor can be approximately
calculated by output current and DCR of inductor.
P
The junction to ambient temperature can be got from
power dissipation in the TD1501 and thermal impedance
from junction to ambient.
T
The maximum junction temperature of TD1501 is 145°C,
which limits the maximum load current capability. Please
see the thermal de-rating curves for the maximum load
current of the TD1501 under different ambient
temperatures.
The thermal performance of the TD1501 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.
December, 20, 2005. Techcode Semiconductor Limited www.techcodesemi.com
total _loss
inductor
(jun-amb)
T
3A 150KHz PWM Buck DC/DC Converter
_loss= I
=(P
= V
totalloss
IN
echcode
× I
O
IN
2
–P
× R
– V
inductorloss
inductor
O
× I
O
× 1.1
)× Θ
®
JA
14
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.
DATASHEET
TD1501
Datasheet pdf - http://www.DataSheet4U.net/