TEA1024T 查看數據表（PDF） - Philips Electronics

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TEA1024T

High efficiency DC/DC converter

Philips Electronics 

Philips Semiconductors

High efficiency DC/DC converter

Product specification

TEA1204T

Burst mode trigger input

For burst-mode applications, in which the required output

power periodically changes between two different power

levels, the burst mode trigger feature gains optimal

dynamic response. A digital signal indicating the load

change must be connected to the burst pin. Polarity of the

burst signal is arbitrary. When not used, the burst pin must

be tied to pin 3 or pin 6.

Shut-down

When the shut-down pin is made HIGH, the converter

disables both switches and power consumption is reduced

to a few µA.

Power switches

The power switches in the IC are one N-type and one

P-type MOSFET, having a typical pin-to-pin resistance of

0.12 Ω and 0.16 Ω respectively. The maximum average

current in the switches is 1.0 A.

Temperature protection

At too high device temperature (typical 165 °C), the

converter stops operating. It resumes operation when the

device temperature falls below 165 °C again. As a result,

low-frequent cycling between on and off state will occur.

It should be noted that in the event of device temperatures

around the cut-off limit, the application differs strongly from

maximum specifications.

Current limiters

If the current in one of the power switches exceeds its limit,

current ramping is stopped immediately, and the next

switching phase is entered. Current limitation is required to

enable optimal use of energy in Lithium-Ion batteries, and

to keep power conversion efficient during temporary high

loads. Furthermore, current limitation protects the IC

against overload conditions, inductor saturation, etc.

Behaviour at input voltage exceeding the specified

range

In general, an input voltage exceeding the specified range

is not recommended since instability may occur. There are

two exceptions:

• Upconversion: at an input voltage equal to or higher than

the target output voltage, but up to 6 V, the converter will

stop switching and the external schottky diode will take

over, resulting in Vo equalling Vi minus the diode voltage

drop.

• Downconversion: when the input voltage is equal to or

lower than the target output voltage, but higher than

2.6 V, the P-type FET will stay conducting resulting in Vo

being equal to Vi minus some resistive voltage drop.

The current limit function remains active.

handbook, halfpage

low power

mode

medium power

mode 1

medium power

mode 2

increasing

load

low DC current

high DC current

time

MGK924

Fig.3 Coil current waveforms in the various power

modes.

1998 Mar 02

6

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