參數(shù)資料
型號(hào)： TEA1532
廠商： NXP Semiconductors N.V.
英文描述： GreenChip SMPS control IC
中文描述： 綠色芯片開關(guān)電源控制IC
文件頁(yè)數(shù)： 9/27頁(yè)
文件大?。?/td> 147K
代理商： TEA1532
9397 750 13113
Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Preliminary data sheet
Rev. 01 — 28 May 2004
9 of 27
Philips Semiconductors
TEA1532
GreenChip
II SMPS control IC
When the voltage on pin CTRL is below 0.63 V, the IC is assumed to be out of
regulation (e.g. the control loop is open). In this case activating pin PROTECT
(V
PROTECT
> 2.5 V) will cause the converter to stop switching. Once V
CC
drops below
V
UVLO
, capacitor C
VCC
will be recharged and the supply will restart. This cycle will be
repeated until the fault condition is removed (safe restart mode)
When the voltage on pin CTRL is above 0.63 V, the IC is assumed to be in regulation.
In this case activating pin PROTECT (V
PROTECT
> 2.5 V), by external means, will latch
the IC: The voltage on pin V
CC
will cycle between V
start
and V
UVLO
, but the IC will not
start switching again until the latch function is reset. The latch is reset as soon as V
CC
drops below 4.5 V (typical value). The internal overtemperature protection will also
trigger this latch; see also
Figure 1
.
A voltage higher than 3 V on pin PROTECT will always latch the IC. This is independent of
the state of the IC.
7.13 Valley switching
Refer to
Figure 8
. A new cycle starts when the power switch is activated. After the on-time
(determined by the sense voltage and the internal control voltage), the switch is opened
and the secondary stroke starts. After the secondary stroke, the drain voltage shows an
oscillation with a frequency of approximately
where L
p
is the primary self inductance of the transformer and C
d
is the capacitance on
the drain node.
As soon as the oscillator voltage is high again and the secondary stroke has ended, the
circuit waits for the lowest drain voltage before starting a new primary stroke. This method
is called valley detection.
Figure 8
shows the drain voltage, valley signal, secondary stroke
signal and the oscillator signal.
In an optimum design, the reflected secondary voltage on the primary side will force the
drain voltage to zero. Thus, zero voltage switching is possible, preventing large capacitive
1
2
--
switching losses
, and allowing high frequency operation, which
results in small and cost effective magnetics.
(
2
π
×
L
p
C
d
×
)
×
(
-------------------------------------------------
P
C
V
2
×
f
×
×
=
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1532AP/N1,112 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 GREENCHIP 2 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
TEA1532APN 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 GREENCHIP 2 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
TEA1532AT/N1,118 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 GREENCHIP 2 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
TEA1532AT/N1/DG,11 功能描述:開關(guān)變換器、穩(wěn)壓器與控制器 12V 170mA 63KHz RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關(guān)頻率:1 MHz 工作溫度范圍: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
TEA1532AT/N1/DG,118 制造商:NXP Semiconductors 功能描述:Cut Tape
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