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參數(shù)資料
| 型號： | TEA1532T |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | GreenChip SMPS control IC |
| 中文描述： | 2 A SWITCHING CONTROLLER, 75 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3.90 MM, PLASTIC, SO-8 |
| 文件頁數(shù)： | 9/27頁 |
| 文件大?。?/td> | 147K |
| 代理商： | TEA1532T |
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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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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1532T/N1,118 | 功能描述:開關變換器、穩(wěn)壓器與控制器 GREENCHIP 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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1532T/N1-T | 功能描述:開關變換器、穩(wěn)壓器與控制器 GREENCHIP 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 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1533AP | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChip SMPS control IC |
| TEA1533AP/N1,112 | 功能描述:電壓模式 PWM 控制器 SMPS LOW STANDBY RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TEA1533APN | 功能描述:電壓模式 PWM 控制器 SMPS LOW STANDBY GREENCHIP RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓撲結構:Buck 輸出電壓:34 V 輸出電流: 開關頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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