參數(shù)資料
型號(hào)： TEA1507
廠商： NXP Semiconductors N.V.
英文描述： GreenChipII SMPS control IC
中文描述： GreenChipII開關(guān)電源控制IC
文件頁(yè)數(shù)： 9/20頁(yè)
文件大?。?/td> 114K
代理商： TEA1507
2000 Dec 05
9
Philips Semiconductors
Preliminary specification
GreenChip
II SMPS control IC
TEA1507
Burst mode standby
Pin CTRL (pin 3)isalsousedtoimplementtheburstmode
standby. In burst mode standby, the power supply enters
a special low dissipation state, where it typically consumes
less than 1 W of input power (P
o
< 100 mW), but is still
able to supply a microprocessor, for example. Figure 12
shows a flyback converter using the burst mode standby
function. The system enters burst mode standby when the
microprocessor closes switches S2 and S3 on the
secondary side. Switch S2 connects the high voltage
output secondary winding to the low voltage
microprocessor capacitor (C
μ
C
), bypassing C
o
.
When the voltage on C
μ
C
exceeds the Zener voltage, the
opto-coupler is activated, sending a large current signal to
CTRL. In response to this signal, the IC stops switching
and enters a ‘hiccup’ mode. This burst activation signal
should be present for longer than the ‘burst blank’ period
(typically 30
μ
s): the blanking time prevents false burst
triggering due to spikes. Figure 11 shows the burst-mode
standby signals. The hiccup mode during burst mode
standby operation does not differ from the hiccup mode in
safe-restart mode during a system fault condition (e.g.
OVP or output short circuit). The power is reduced
during soft-restart mode.
Burst mode standby operation continues until the
microcontroller opens switches S2 and S3. The system
then enters the start-up sequence and begins normal
switching behaviour.
(For burst mode specification, see Figs 11 and 12.)
Soft start-up (pin I
sense
)
To prevent transformer rattle during hiccup, the
transformer peak current is slowly increased by the soft
start function. This can be achieved by inserting a resistor
and a capacitor between pin I
sense
(pin 5) and the sense
resistor. An internal current source charges the capacitor
to V = I
ss
×
R
ss
, with a maximum of about 0.5 V.
The start level and the time constant of the increasing
primary current level can be adjusted externally by
changing the values of R
ss
and C
ss
.
The charging current I
ss
will flow as long as the voltage on
pin I
sense
is below approximately 0.5 V. If the voltage on
pin I
sense
exceeds the 0.5 V, the soft start current source
willstartlimitingthecurrentI
ss
.At theV
CC(start)
level,theI
ss
current source is completely switched off (see Fig.9).
Since the soft start current I
ss
is subtracted from pin V
CC
charging current, the R
ss
value will affect the V
CC
charging
current level by a maximum of 60
μ
A (typical value).
Driver
The driver circuit to the gate of the power MOSFET has a
current sourcing capability of typically 125 mA and a
current sink capability of typical 540 mA. This permits fast
turn-on and turn-off of the power MOSFET for efficient
operation.
A low driver source current has been chosen to limit the
V/
t at switch-on. This reduces Electro Magnetic
Interference (EMI) and also limits the current spikes
across R
sense
.
I
burstmode
V
R
CTRL
----------------
I
th on
)
+
=
I
primary(max)
V
-------------------------------------------
I
R
×
(
)
–
R
sense
=
τ
R
ss
C
ss
×
=
handbook, halfpage
CSS
RSS
Isense
Rsense
ISS
Vocp
start-up
MGU237
pin 5
0.5 V
Fig.9 Soft start-up.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TEA1507P 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:GreenChipII SMPS control IC
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(shí)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(fēng)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(guān)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(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
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