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參數(shù)資料
| 型號： | TEA1507P |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | GreenChipII SMPS control IC |
| 中文描述： | 2 A SWITCHING CONTROLLER, 205 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 6/20頁 |
| 文件大?。?/td> | 114K |
| 代理商： | TEA1507P |
2000 Dec 05
6
Philips Semiconductors
Preliminary specification
GreenChip
II SMPS control IC
TEA1507
Current mode control
Current mode control is used for its good line regulation
behaviour.
The ‘on-time’ is controlled by the internally inverted control
pin voltage, which is compared with the primary current
information. The primary current is sensed across an
external resistor. The driver output is latched in the logic,
preventing multiple switch-on.
The internal control voltage is inversely proportional to the
external control pin voltage, with an offset of 1.5 V. This
means that a voltage range from 1 to 1.5 V on pin CTRL
will result in an internal control voltage range from
0.5 to 0 V (the maximum external control voltage results in
a minimum duty cycle).
Oscillator
The maximum fixed frequency of the oscillator is set by an
internal current source and capacitor. The maximum
frequency is reduced once the control voltage enters the
VCO control window. Then, the maximum frequency
changes linearly with the control voltage until the minimum
frequency is reached (see Figs 5 and 6).
Valley switching
(see Fig.7)
A new cycle starts when the power switch is switched on.
After the ‘on-time’ (which is 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 7 shows the
drain voltage together with the valley signal, the signal
indicating the secondary stroke 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 very possible, preventing large
capacitive switching losses
, and
allowing high frequency operation, which results in small
and cost effective inductors.
Demagnetization
The system will be in discontinuous conduction mode all
the time. The oscillator will not start a new primary stroke
until the secondary stroke has ended.
Demagnetization features a cycle-by-cycle output
short-circuit protection by immediately lowering the
frequency (longer off-time), thereby reducing the power
level.
Demagnetization recognition is suppressed during the first
t
suppr
time. This suppression may be necessary in
applications where the transformer has a large leakage
inductance and at low output voltages/start-up.
Minimum and maximum ‘on-time’
The minimum ‘on-time’ of the SMPS is determined by the
Leading Edge Blanking (LEB) time. The IC limits the
‘on-time’ to 50
μ
s. When the system desires an ‘on-time’
longer than 50
μ
s, a fault condition is assumed (e.g.
removed C
i
), the IC will stop switching and enter the safe
restart mode.
1
(
2
π
×
L
p
C
d
×
)
×
(
)
---------------------------------------------------
P
1
2
C
V
2
×
f
×
×
=
handbook, halfpage
VCTRL
1 V
(typ)
0.5 V
1.5 V
(typ)
MGU233
Fig.5 The V
sense(max)
voltage as function of V
CTRL
.
handbook, halfpage
Vsense(max)
MGU234
f
6 kHz
175 kHz
50 mV
(typ)
75 mV
(typ)
Fig.6 The VCO frequency as function of V
sense(max)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TEA1507P/N1,112 | 功能描述:轉(zhuǎn)換 - 電壓電平 SMPS GREENCHIP II RoHS:否 制造商:Micrel 類型:CML/LVDS/LVPECL to LVCMOS/LVTTL 傳播延遲時間:1.9 ns 電源電流:14 mA 電源電壓-最大:3.6 V 電源電壓-最小:3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:MLF-8 |
| TEA1520 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:STARplug |
| TEA1520P | 制造商:STMicroelectronics 功能描述:NXP IC 8-PIN DIP |
| TEA1520P/N2,112 | 功能描述:開關變換器、穩(wěn)壓器與控制器 POWERPLUG 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 |
| TEA1520PN | 功能描述:開關變換器、穩(wěn)壓器與控制器 POWERPLUG 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 |
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