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參數(shù)資料
| 型號： | TEA1200TS |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.95 V starting DC-to-DC converter with low battery indicator |
| 中文描述： | 5 A SWITCHING REGULATOR, 720 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | 4.40 MM, PLASTIC, MO-152, SOT-369-1, SSOP-16 |
| 文件頁數(shù)： | 15/24頁 |
| 文件大?。?/td> | 104K |
| 代理商： | TEA1200TS |
2002 May 14
15
Philips Semiconductors
Product specification
0.95 V starting DC-to-DC converter
with low battery indicator
TEA1200TS
External component selection
I
NDUCTOR
L1
The performance of the TEA1200TS is not very sensitive
to inductance value. The best efficiency performance over
a wide load current range is achieved by using an
inductance of 6.8
μ
H e.g. TDK SLF7032 or Coilcraft
DO1608 range.
DC-
TO
-DC
CONVERTER INPUT CAPACITOR
C1
The value of C1 strongly depends on the type of input
source. In general, a 100
μ
F tantalum capacitor is
sufficient.
DC-
TO
-DC
CONVERTER OUTPUT CAPACITOR
C2
Thevalueand typeof C2 dependsonthemaximum output
current and the ripple voltage which is allowed in the
application. Low-ESR tantalum capacitors show good
results. The most important specification of C2 is its ESR,
which mainly determines the output voltage ripple.
D
IODE
D1
The Schottky diode is only used for short time during
takeover from N-type power MOSFET and P-type power
MOSFET and vice versa. Therefore, a medium-power
diode is sufficient in most applications e.g. Philips
PRLL5819.
F
EEDBACK RESISTORS
R1
AND
R2
The output voltage of the DC-to-DC converter is
determined by the resistors R1 and R2. The following
conditions apply:
Only use a 1% accurate SMD type resistors. If larger
body-size resistors are used, the capacitance on
pin FB0 will be too large, and could cause 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 following equation:
C
URRENT LIMITING RESISTOR
R10
The maximum instantaneous current is set by the external
resistor R10. The preferred type is SMD, with 1%
accuracy.
The connection of resistor R10 differs for each mode:
At upconversion: resistor R10 must be connected
between pins ILIM and UPOUT/DNIN; the current
limiting level is defined by:
At downconversion: resistor R10 must be connected
between pins ILIM and GND0; the current limiting level
R10
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.
R
EFERENCE VOLTAGE DECOUPLING CAPACITOR
C5
Optionally, a decoupling capacitor can be connected
between pin V
ref
and ground in order to achieve a lower
noise level of the output voltages of the LDO. The best
choice for C5 is a ceramic multilayer capacitor of
approximately 10 nF.
L
OW BATTERY DETECTOR COMPONENTS
R7, R8
AND
R9
Resistor R7 is connected between pin LBO and the input
or output pin and must be 330 k
or higher.
A 1-cell NiCd or NiMH battery can be connected directly to
pin LBI1.
A higher battery voltage can be detected by application of
a divider circuit with resistor R8 and R9. The low-battery
detection level for a higher battery voltage can be set by
using the following equation:
R8
R9
+
(
Sincecurrent flowsintopinLBI1, theparallelimpedanceof
R8 and R9 must be approximately 1 k
in order to avoid
inaccuracy due to the spread of the LBI1 current.
V
o
V
ref
1
R2
R1
+
×
=
I
Iim
R10
=
I
Iim
300
=
V
LBI det
)
)
V
det
)
--------R9
×
=
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