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TEA1210TS/N1 View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TEA1210TS/N1
Philips
Philips Electronics Philips
TEA1210TS/N1 Datasheet PDF : 20 Pages
1 2 3 4 5 6 7 8 9 10 Next Last
Philips Semiconductors
High efficiency, high current DC/DC converter
Preliminary specification
TEA1210TS
In the PFM mode, regulation information from earlier PWM
operating modes is used. This results in optimum inductor
peak current levels in the PFM mode, which are slightly
larger than the inductor ripple current in the PWM mode.
As a result, the transition between PFM and PWM mode is
optimum under all circumstances. In the PFM mode,
TEA1210TS regulates the output voltage to the high
window limit shown in Fig.3.
Synchronous rectification
For optimum efficiency over the whole load range,
synchronous rectifiers inside the TEA1210TS 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.
PWM-only mode
When pin PWM is pulled to HIGH-level in the
upconversion mode, the TEA1210TS will use PWM
regulation independent of the load applied. As a result, the
switching frequency does not vary over the whole load
range. Furthermore, the P-type power MOSFET is always
on when the input voltage exceeds the target output
voltage. The internal synchronous rectifier still takes care
that the inductor current does not fall below zero. In this
way, the achieved efficiency is higher than in standard
PWM-controlled converters.
Start-up
Start-up from low input voltage in boost mode is realized
by an independent start-up oscillator, which starts
switching the N-type power MOSFET as soon as the
voltage on pins UPOUT is measured to be sufficiently
high. The switch actions of the start-up oscillator will
increase the output voltage. As soon as the output voltage
is high enough for normal regulation, the digital control
system takes over the control of the power MOSFETs.
Undervoltage lockout
As a result of too high load or disconnection of the input
power source, the output voltage can drop so low that
normal regulation cannot be guaranteed. In that case, the
device switches back to start-up mode. If the output
voltage drops down even further, switching is stopped
completely.
Shut-down
When the shut-down input is made HIGH, the converter
disables both switches and power consumption is reduced
to a few microamperes.
handbook, full pagewidth
Vo
IL
load increase
start corrective action
high window limit
low window limit
time
1999 Mar 08
time
Fig.3 Response to load increase.
6
MGK925
 

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