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TEA1506AP датащи(PDF) 7 Page - NXP Semiconductors

номер детали TEA1506AP
подробное описание детали  GreenChip SMPS control IC
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производитель  PHILIPS [NXP Semiconductors]
домашняя страница  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TEA1506AP датащи(HTML) 7 Page - NXP Semiconductors

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2003 Sep 09
7
Philips Semiconductors
Product specification
GreenChip
™II SMPS control IC
TEA1506P; TEA1506AP;
TEA1506T; TEA1506AT
Cycle skipping
At very low power levels, a cycle skipping mode will be
activated. A high control voltage will reduce the switching
frequency to a minimum of 25 kHz. If the voltage on the
control pin is raised even more, switch-on of the external
power MOSFET will be inhibited until the voltage on the
control pin has dropped to a lower value again (see Fig.8).
For system accuracy, it is not the absolute voltage on the
control pin that will trigger the cycle skipping mode, but a
signal derived from the internal VCO will be used.
Remark: If the no-load requirement of the system is such
that the output voltage can be regulated to its intended
level at a switching frequency of 25 kHz or above, the
cycle skipping mode will not be activated.
handbook, halfpage
Vsense(max) (V)
MGU509
f
(kHz)
25
175
175 kHz
VCO2
level
VCO1
level
Fig.7 VCO frequency as function of Vsense(max).
handbook, full pagewidth
MGU510
1.5 V
− VCTRL
Isense
fosc
fmax
fmin
Vx (mV)
CTRL
current
comparator
cycle
skipping
X2
V
I
1
0
Vx
150 mV
OSCILLATOR
DRIVER
DRIVER
Vx (mV)
dV2
dV1
150
Fig.8 The cycle skipping circuitry.
The voltage levels dV1 and dV2 are fixed in the IC to 50 mV (typical) and 18 mV (typical) respectively.


Аналогичный номер детали - TEA1506AP

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Аналогичное описание - TEA1506AP

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