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參數資料
型號: TEA1751T/N1,518
廠商: NXP Semiconductors
文件頁數: 13/29頁
文件大小: 253K
描述: IC CTRLR GREENCHIP SMPS 16-SOIC
標準包裝: 2,500
系列: GreenChip™ III
模式: 連續導電(CCM)
頻率 - 開關: 125kHz
電流 - 啟動: 60µA
電源電壓: 0.65 V ~ 22 V
安裝類型: 表面貼裝
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
供應商設備封裝: 16-SO
包裝: 帶卷 (TR)
TEA1751T_LT_2
?NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 02  23 December 2009
13 of 29
NXP Semiconductors
TEA1751T; TEA1751LT
GreenChip III SMPS control IC
 
7.3.2   Valley switching (HV pin)
Refer to Figure 9
. A new cycle starts when the external MOSFET is activated. After the
on-time (determined by the FBSENSE voltage and the FBCTRL voltage), the MOSFET is
switched off and the secondary stroke starts. After the secondary stroke, the drain voltage
shows an oscillation with a frequency of approximately
 where L
p
 is
the primary self-inductance of the flyback transformer and C
d
 is the capacitance on the
drain node.
As soon as the internal oscillator voltage is high again and the secondary stroke has
ended, the circuit waits for the lowest drain voltage before starting a new primary stroke.
Figure 9
 shows the drain voltage, valley signal, secondary stroke signal and the internal
oscillator signal.
Valley switching allows high frequency operation as capacitive switching losses are
reduced, see Equation 1
. High frequency operation makes small and cost-effective
magnetics possible.
(1)
Fig 8.    Frequency control of flyback part
f
sw(fb)max
V
FBCTRL
1.5 V
discontinuous
with valley
switching
quasi resonant
frequency
reduction
PFC off
switching frequency
014aaa15
PFC on
1
2   ?/SPAN>
?/DIV>
L
p
C
d
?/DIV>
(
)
?/DIV>
(
)
-------------------------------------------------- -
P
1
2
---   C
d
V
2
?/DIV>
f
?/DIV>
?/DIV>
=
?/DIV>
?/DIV>
?/DIV>
?/DIV>
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