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TEA1210TS View Datasheet(PDF) - Philips Electronics

Part Name
Description
Manufacturer
TEA1210TS
Philips
Philips Electronics Philips
TEA1210TS Datasheet PDF : 20 Pages
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Philips Semiconductors
High efficiency, high current DC/DC converter
Preliminary specification
TEA1210TS
Power switches
The power switches in the IC are one N-type and one
P-type power MOSFET, having a typical drain-to-source
resistance of 56 and 68 mrespectively. The maximum
average current in the power switches is 1.8 A at
Tamb = 60 °C.
Temperature protection
When the device operates in the PWM mode, and the die
temperature gets too high (typically 175 °C), the converter
stops operating. It resumes operation when the die
temperature falls below 175 °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
in the PWM mode, the current ramp is stopped
immediately, and the next switching phase is entered.
Current limiting is required to keep power conversion
efficient during temporary high loads. Furthermore, current
limiting protects the IC against overload conditions,
inductor saturation, etc.
In the upconversion mode, the first current limit is set by an
external resistor connected between the pins ILIMH
and UPOUT and the second current limit is set by an
external resistor connected between the pins ILIML
and UPOUT. The digital signal on the current limiting
selection input determines which resistor sets the limit
level (pin ILIMSEL = HIGH results in the use of pin ILIMH).
The current limiting selection input can accept a digital
signal having a HIGH-level of just 55% of the voltage on
pins UPOUT. The noise margin on this input is increased
by a low-pass filter, having a cutoff frequency of about
50 MHz. However, for stability reasons the level on the
current limiting selection input shall not change within a
period shorter than 20 ms.
In case just one current limit is sufficient, the unused pin
(pin ILIML or ILIMH) must be connected either to the other
pin (pin ILIMH or ILIML), or to pin UPOUT.
In the downconversion mode, the current limiting level is
set internally at a fixed value which is higher than the
current level that most applications require. It should be
regarded as a protection function only. In the
downconversion mode, pins ILIMH and ILIML must be
connected to pin UPOUT.
handbook, full pagewidth
Vout, typ
Vh
2%
Vl
maximum positive spread of Vfb
Vh
2%
Vl
+4%
4%
Vh
2%
typical situation
Vl
maximum negative spread of Vfb
upper specification limit
lower specification limit
MGR667
1999 Mar 08
Fig.4 Spread of location of output voltage window.
7
 

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