参数资料
型号: TEA1612T
厂商: NXP SEMICONDUCTORS
元件分类: 模拟信号调理
英文描述: SPECIALTY ANALOG CIRCUIT, PDSO24
封装: 7.50 MM, PLASTIC, MS-013, SOT137-1, SOP-24
文件页数: 15/19页
文件大小: 108K
代理商: TEA1612T
TEA1612T_1
NXP B.V. 2009. All rights reserved.
Product data sheet
Rev. 01 — 24 September 2009
5 of 19
NXP Semiconductors
TEA1612T
Zero voltage switching resonant converter controller
[1]
Provided as a high voltage spacer
7.
Functional description
7.1 Start-up
When the applied voltage at pin VDD reaches VDD(init) (see Figure 4), the low side power
switch is turned-on while the high side power switch remains in the non-conducting state.
This start-up output state guarantees the initial charging of the bootstrap capacitor (Cboot)
used for the oating supply of the high side driver.
During start-up, the voltage on the frequency capacitor (Cf) is zero and denes the
start-up state. The voltage at the soft start pin (CSS) is set to 2.7 V. The CSS pin voltage
is copied to the VCO pin via a buffer and switching starts at about 80 % of the maximum
frequency at the moment VDD reaches the start level.
The start-up state is maintained until VDD reaches the start level (13.5 V), the oscillator is
activated and the converter starts operating.
VREF
22
reference voltage
HYST
23
hysteresis reference input for burst mode
BURST
24
burst comparator input
Table 2.
Pin description, proposal
Symbol
Pin
Description
Fig 4.
Start-up
014aaa036
VDD
0
GH-SH
VDD(startup)
VDD(init)
t
GL
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