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PDF TEA1206T Data sheet ( Hoja de datos )
| Número de pieza | TEA1206T | |
| Descripción | High efficiency DC/DC converter | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TEA1206T
High efficiency DC/DC converter
Preliminary specification
Supersedes data of 1998 Mar 24
File under Integrated Circuits, IC03
1999 Sep 16
1 page  
Philips Semiconductors
High efficiency DC/DC converter
Preliminary specification
TEA1206T
PINNING
SYMBOL
U/D
ILIM
UPOUT/DNIN
LX
SYNC
GND
FB
SHDWN
PIN DESCRIPTION
1 conversion mode selection input
2 current limit resistor connection
3 up mode; output voltage/
down mode; input voltage
4 inductor connection
5 synchronization clock input
6 ground
7 feedback input
8 shut-down input
handbook, halfpage
U/D 1
8 SHDWN
ILIM 2
7 FB
TEA1206T
UPOUT/DNIN 3
6 GND
LX 4
5 SYNC
MGM667
Fig.2 Pin configuration.
FUNCTIONAL DESCRIPTION
Control mechanism
The TEA1206T DC/DC converter is able to operate in PFM
(discontinuous conduction) or PWM (continuous
conduction) operation. All switching actions are completely
determined by a digital control circuit which uses the
output voltage level as its control input. This novel digital
approach enables the use of a new pulse width and
frequency modulation scheme, which ensures optimum
power efficiency over the complete range of operation of
the converter. The scheme works as follows.
When high output power is requested, the device will
operate in PWM (continuous conduction) mode.
This results in minimum AC currents in the circuit
components and hence optimum efficiency, cost and
EMC. In this mode, the output voltage is allowed to vary
between two predefined voltage levels. As long as the
output voltage stays within this so-called window,
switching continues in a fixed pattern. When the output
voltage reaches one of the window borders, the digital
controller immediately reacts by adjusting the pulse width
and inserting a current step in such a way that the output
voltage stays within the window with higher or lower
current capability. This approach enables very fast
reaction to load variations.
Figure 3 shows the converter’s response to a sudden load
increase. The upper trace shows the output voltage.
The ripple on top of the DC level is a result of the current
in the output capacitor, which changes in sign twice per
cycle, times the capacitor’s internal Equivalent Series
Resistance (ESR). After each ramp-down of the inductor
current, i.e. when the ESR effect increases the output
voltage, the converter determines what to do in the next
cycle. As soon as more load current is taken from the
output the output voltage starts to decay. When the output
voltage becomes lower than the low limit of the window,
a corrective action is taken by a ramp-up of the inductor
current during a much longer time. As a result, the DC
current level is increased and normal PWM control can
continue. The output voltage (including ESR effect) is
again within the predefined window.
Figure 4 depicts the spread of the output voltage window.
The absolute value is most dependent on spread, while the
actual window size is not affected. For one specific device,
the output voltage will not vary more than 2% typically.
In low output power situations, TEA1206T will switch over
to PFM (discontinuous conduction) mode operation. In this
mode, regulation information from earlier PWM mode
operation is used. This results in optimum inductor peak
current levels in PFM mode, which are slightly larger than
the inductor ripple current in PWM mode. As a result, the
transition between PFM and PWM mode is optimal under
all circumstances. In PFM mode, TEA1206T regulates the
output voltage to the high window limit shown in Fig.3.
Synchronous rectification
For optimal efficiency over the whole load range,
synchronous rectifiers inside TEA1206T ensure that
during the whole second switching phase, all inductor
current will flow through the low-ohmic power MOSFETS.
Special circuitry is included which detects that the inductor
current reaches zero. Following this detection, the digital
controller switches off the power MOSFET and proceeds
regulation.
1999 Sep 16
5
5 Page 
Philips Semiconductors
High efficiency DC/DC converter
APPLICATION INFORMATION
Preliminary specification
TEA1206T
handbook, full pagewidth
L1
VI
C1
D1
UPOUT/DNIN
LX TEA1206T
FB
U/D GND SYNC SHDWN ILIM
Rlim
R1
C2
R2
VO
MGM670
Fig.6 Complete application for upconversion.
handbook, full pagewidth
VI
C2
UPOUT/DNIN
LX
TEA1206T
U/D ILIM SYNC
FB
GND SHDWN
Rlim
L1
R1
VO
C1
D2 R2
MGM671
1999 Sep 16
Fig.7 Complete application for downconversion.
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TEA1206T.PDF ] | |
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