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參數(shù)資料
| 型號： | EL7642ILTZ-T13 |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | TFT-LCD DC/DC with Integrated Amplifiers |
| 中文描述： | 3 A SWITCHING REGULATOR, 1350 kHz SWITCHING FREQ-MAX, QCC32 |
| 封裝： | 5 X 5 MM, ROHS COMPLIANT, MO-220, TQFN-32 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 493K |
| 代理商： | EL7642ILTZ-T13 |
15
FN7415.1
September 26, 2005
V
OFF
supplies. It can be appreciated that should a regular
supply of LX switching edges be interrupted, for example
during discontinuous operation at light boost load currents,
then this may affect the performance of V
ON
and V
OFF
regulation – depending on their exact loading conditions at
the time.
To optimize V
ON
/V
OFF
regulation, the boundary of
discontinuous/continuous operation of the boost converter
can be adjusted, by suitable choice of inductor given V
IN
,
V
OUT
, switching frequency and the V
BOOST
current loading,
to be in continuous operation.
The following equation gives the boundary between
discontinuous and continuous boost operation. For
continuous operation (LX switching every clock cycle) we
require that:
I(V
BOOST
_load) > D*(1-D)*V
IN
/(2*L*F
OSC
)
where the duty cycle, D = (V
BOOST
– V
IN
)/V
BOOST
For example, with V
IN
= 5V, F
OSC
= 1.2MHz and V
BOOST
=
12V we find continuous operation of the boost converter can
be guaranteed for:
L = 10μH and I(V
BOOST
) > 51mA
L = 6.8μH and I(V
BOOST
) > 74mA
L = 3.3μH and I(V
BOOST
) > 153mA
Start-up Sequence
Figure 23 shows a detailed start-up sequence waveform. For
a successful power-up, there should be 6 peaks at V
CDLY
.
When a fault is detected, the device will latch off until either
EN is toggled or the input supply is recycled.
When the input voltage is higher than 2.4V, an internal
current source starts to charge C
CDLY
. During the initial slow
ramp, the device checks whether there is a fault condition. If
no fault is found during the initial ramp, C
CDLY
is discharged
after the first peak. V
REF
turns on at the peak of the first
ramp.
Initially the boost is not enabled so V
BOOST
rises to V
IN
-
V
DIODE
through the output diode. Hence, there is a step at
V
BOOST
during this part of the start-up sequence.
V
BOOST
soft-starts at the beginning of the third ramp, and is
checked at the end of this ramp. The soft-start ramp
depends on the value of the C
DLY
capacitor. For C
DLY
of
220nF, the soft-start time is ~2ms.
V
OFF
turns on at the start of the fourth peak.
V
ON
is enabled at the beginning of the sixth ramp. V
OFF
and
V
ON
are checked at end of this ramp.
EL7640, EL7641, EL7642
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| EL7642ILTZ-T7 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 EL7642ILTZ TFT-LCD D C-DC W/INTEGRTD AMP RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| EL7661CN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:IC-100V FULL BRIDGE DRIVER |
| EL7661CS | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:MOSFET Driver |
| EL7761 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:100V Half Bridge Driver |
| EL7761CN | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:100V Half Bridge Driver |
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