參數(shù)資料
型號(hào)： TEA1208T
廠商： NXP SEMICONDUCTORS
元件分類： 穩(wěn)壓器
英文描述： High efficiency DC/DC converter
中文描述： SWITCHING REGULATOR, 330 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 3.90 MM, PLASTIC, MS-012, SOT96-1, SO-8
文件頁(yè)數(shù)： 12/20頁(yè)
文件大?。?/td> 88K
代理商： TEA1208T
2002 Nov 15
12
Philips Semiconductors
Product specification
High efficiency DC/DC converter
TEA1208T
External component selection
I
NDUCTOR
L1
The performance of the TEA1208T is not very sensitive to
the inductance value. Best efficiency performance over a
wide load current range is achieved by using e.g. Coilcraft
DO1608C,havinganinductanceof10
μ
Handasaturation
current level of 1.1 A. In case the maximum output current
islower,otherinductorsarealsosuitablesuchasthesmall
sized Coilcraft DT1608 range or Murata LQH4N series.
I
NPUT CAPACITOR
C1
The value of capacitor C1 strongly depends on the type of
input source. In general, a 100
μ
F tantalum capacitor will
do, or a 10
μ
F ceramic capacitor featuring very low series
resistance (ESR value).
O
UTPUT CAPACITOR
C2
The value and type of capacitor C2 depend on the
maximum output current and the ripple voltage which is
allowed in the application. Low-ESR tantalum as well as
ceramic capacitors show good results. The most important
specification of capacitor C2 is its ESR, which mainly
determines the output voltage ripple.
D
IODE
D1
The Schottky diode is only used a short time during
takeover from N-type power MOSFET and P-type power
MOSFET and vice versa. Therefore, a medium-power
diode such as Philips PRLL5819 is sufficient.
F
EEDBACK RESISTORS
R1
AND
R2
The output voltage is determined by the resistors
R1 and R2. The following conditions apply:
Use1%accurateSMDtyperesistorsonly.Incaselarger
body resistors are used, the capacitance on pin 7
(feedback input) will be too large, causing inaccurate
operation.
Resistors R1 and R2 should have a maximum value of
50 k
when connected in parallel. A higher value will
result in inaccurate operation.
Under these conditions, the output voltage can be
calculated by the formula:
C
URRENT LIMITING RESISTORS
The maximum instantaneous current is set by the external
resistor R
lim
. The preferred type is SMD, 1% accurate.
The connection of resistor R
lim
differs per mode:
At up conversion: resistor R
lim
must be connected
between pin 2 (ILIM) and pin 3 (UPOUT/DNIN).
The current limiting level is defined by:
At down conversion: resistor R
lim
must be connected
between pin 2 (ILIM) and pin 6 (GND).
The current limiting level is defined by:
The average inductor current during limited current
operation also depends on the inductance value, input
voltage, output voltage and resistive losses in all
components in the power path. Ensure that
I
lim
< I
sat
(saturation current) of the inductor.
V
O
1.24
1
R2
R1
+
×
=
I
Iim
Iim
R
=
I
Iim
R
Iim
270
=
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