tea1733mt NXP Semiconductors, tea1733mt Datasheet - Page 6

• Manufacturer Part Number: tea1733mt
• Description: Tea1733mt Greenchip Smps Control Ic
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TEA1733MT
Preliminary data sheet
7.3 Supply management
7.4 Input voltage detection (VINSENSE pin)
7.5 Protection input (PROTECT pin)
When the voltage on pin VCC drops below the V
controller stops switching. A VCC undervoltage causes the TEA1733MT to be latched in
the off-state.
All internal reference voltages are derived from a temperature compensated on-chip band
gap circuit. Internal reference currents are derived from a trimmed and temperature
compensated current reference circuit.
In a typical application the mains input voltage can be detected by the VINSENSE pin.
Switching will not take place until the voltage on VINSENSE has reached the
V
When the VINSENSE voltage drops below V
V
If pin VINSENSE is left open or disconnected, the pin is pulled up by the internal 20 nA
(typical) current source to reach the V
protection.
An internal clamp of 5.2 V (typical) protects this pin from excessive voltages.
Pin PROTECT is a general purpose input pin, which can be used to switch off the
converter (latched protection). The converter is stopped when the voltage on this pin is
pulled above V
current of 32 μA (typical) flows out of the chip when the pin voltage is at the
V
is at the V
Fig 4.
start(VINSENSE)
det(H)(VINSENSE)
det(L)(PROTECT)
VINSENSE
PROTECT
OPTIMER
ISENSE
Start-up sequence, normal operation and restart sequence
det(H)(PROTECT)
charging VCC
V
V
CC
capacitor
O
det(H)(PROTECT)
voltage (typically 0.94 V).
All information provided in this document is subject to legal disclaimers.
level. A current of 107 μA (typical) flows into the chip when the pin voltage
(typically 3.52 V), the converter stops switching and performs a restart.
Rev. 1 — 4 February 2011
level.
converter
starting
(typically 0.8 V) or below V
soft start
operation
normal
det(H)(VINSENSE)
det(L)(VINSENSE)
(power down)
protection
th(UVLO)
level. This triggers a restart
level during normal operation, the
det(L)(PROTECT)
restart
(typically 0.72 V) or exceeds
GreenChip SMPS control IC
014aaa929
TEA1733MT
soft start
V
V
V
V
V
4.5 V
1.2 V
(typically 0.5 V). A
startup
th(UVLO)
det(H)(VINSENSE)
det(H)(PROTECT)
det(L)(PROTECT)
© NXP B.V. 2011. All rights reserved.
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