TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02 23 December 2009
14 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
7.3.3 Current mode control (FBSENSE pin)
Current mode control is used for the flyback converter for its good line regulation.
The primary current is sensed by the FBSENSE pin across an external resistor and
compared with an internal control voltage.The internal control voltage is proportional to
the FBCTRL pin voltage, see Figure 10
.
(1) Start of new cycle at lowest drain voltage.
(2) Start of new cycle in a classical Pulse Width Modulation (PWM) system without valley detection.
Fig 9. Signals for valley switching
drain
secondary
stroke
014aaa027
secondary
ringing
primary
stroke
valley
(2)
(1)
secondary
stroke
oscillator
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