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TEA1703T датащи(PDF) 6 Page - NXP Semiconductors

номер детали TEA1703T
подробное описание детали  GreenChip SMPS standby control IC
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производитель  NXP [NXP Semiconductors]
домашняя страница  http://www.nxp.com
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TEA1703T
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2011. All rights reserved.
Product data sheet
Rev. 2.3 — 28 April 2011
6 of 15
NXP Semiconductors
TEA1703T
GreenChip SMPS standby control IC
7.2 Standby operation
When the output load of the switched-mode power supply falls, the voltage on pin
PSENSE also falls. When the voltage on pin PSENSE falls below the Vth(Psense) level, the
TEA1703T activates its pin OPTO output as soon as its pin SWDET current is above the
Ith(det)sw level.
In a typical application, the switched-mode power supply is disabled by the TEA1703T as
soon as its pin OPTO output is activated. The application’s output voltage will then start to
fall. After a period dependent on the output load and the output capacitor value, the
VSENSE voltage falls below the Vth(Vsense) level and the OPTO output is disabled again.
This restarts the primary-side converter.
If the output load remains low, the application reverts to standby mode again after the
output capacitor has been recharged. When a normal load is detected, the converter
resumes normal operation; see Figure 5.
7.3 Voltage sensing (pin VSENSE)
If the voltage on pin VSENSE is above the Vth(Vsense) level, pin VSENSE outputs a current
IO(Vsense), which, in combination with the external resistive divider, creates a hysteresis on
the adapter output voltage level. In a typical application, the effective output voltage
hysteresis is larger than that set by IO(Vsense) and the resistive divider. This is because the
external PSENSE filter circuit keeps the PSENSE voltage above the Vth(Psense) level as
long as the output capacitor is not charged to the normal output voltage level.
Fig 5.
Standby operation signals
Vth(Vsense)
Vo(nom)
Vth(Psense)
Ith(det)sw
normal operation
standby
standby
normal operation
low output
load
stopping
SMPS
re-starting
SMPS
re-starting
SMPS
stopping
SMPS
output load
output voltage
VSENSE
PSENSE
SWDET
OPTO
primary side
converter active
001aan123


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