tea1612t NXP Semiconductors, tea1612t Datasheet - Page 5

• Manufacturer Part Number: tea1612t
• Description: Zero Voltage Switching Resonant Converter Controller
• Manufacturer: NXP Semiconductors

NXP Semiconductors
7. Functional description
TEA1612T_1
Product data sheet
7.1 Start-up
Table 2.
[1]
When the applied voltage at pin V
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 (C
used for the floating supply of the high side driver.
During start-up, the voltage on the frequency capacitor (C
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 V
The start-up state is maintained until V
activated and the converter starts operating.
Symbol
VREF
HYST
BURST
Fig 4.
Provided as a high voltage spacer
Start-up
Pin description, proposal
Pin
22
23
24
GH-SH
V
GL
DD
Rev. 01 — 24 September 2009
0
0
0
DD
Description
reference voltage
hysteresis reference input for burst mode
burst comparator input
reaches the start level.
Zero voltage switching resonant converter controller
DD
reaches V
DD
reaches the start level (13.5 V), the oscillator is
DD(init)
(see
f
) is zero and defines the
Figure
t
V
V
DD(startup)
DD(init)
014aaa036
4), the low side power
TEA1612T
© NXP B.V. 2009. All rights reserved.
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