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T8305 Datasheet(PDF) 7 Page - Taiwan Memory Technology

Part # T8305
Description  PWM Control 18V Step-Down Controller
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Manufacturer  TMT [Taiwan Memory Technology]
Direct Link  http://www.tmtech.com.tw
Logo TMT - Taiwan Memory Technology

T8305 Datasheet(HTML) 7 Page - Taiwan Memory Technology

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TE
CH
tm
T8305
TM Technology, Inc. reserves the right
P. 6
Publication Date: Mar. 2013
to change products or specifications without notice.
Revision: A
Applications Information
Setting nominal average output current with external resistor RS
The nominal average output current in the LED(s) is determined by the value of the external current
sense resistor (RS) connected between VIN and ISENSE and is given by:
IOUTnom = 0.2/RS [for RS ≥ 0.1 ohm]
The table below gives values of nominal average output current for several preferred values of
current setting resistor (RS) in the typical application circuit :
RS (ohm)
0.1
0.132
0.285
0.57
Nominal average
output current (mA)
2000
1500
700
350
.
Note that RS = 0.1ohm is the minimum allowed value of sense resistor under these conditions to
maintain switch current below the specified maximum value. It is possible to use different values of
RS.
Shutdown mode
Taking the EN pin to a voltage below 0.5V for more than approximately 100us, will turn off the
output and supply current will fall to a low standby level of 35uA nominal.
Capacitor selection
A low ESR capacitor should be used for input decoupling, as the ESR of this capacitor appears in
series with the supply source impedance and lowers overall efficiency. This capacitor has to supply
the relatively high peak current to the coil and smooth the current ripple on the input supply. A
minimum value of 47uF is acceptable if the input source is close to the device, but higher values
will improve performance at lower input voltages, especially when the source impedance is high. In
order to avoid high frequency noise influence and improve circuit stability, it is recommended to
shunt a value of 0.22uF Capacitor. The input capacitor should be placed as close as possible to the
IC. For maximum stability over temperature and voltage, capacitors with X7R, X5R, or better
dielectric are recommended. Capacitors with Y5V dielectric are not suitable for decoupling in this
application and should not be used.


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