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TEA1738FT Datasheet PDF : 20 Pages
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NXP Semiconductors
TEA1738FT
GreenChip SMPS control IC
7.13 Peak power, medium power and low power operation
The switching frequency is increased for peak power operation. In medium power
operation the switching losses are reduced by lowering the switching frequency. A second
frequency reduction step is made when the output power is reduced to low power. In low
power operation the converter switching frequency is reduced while the peak current is
set to 25 % of the maximum peak current. (see Figure 6 and Figure 9)
fosc
80 kHz
66 kHz
28 kHz
high
power
peak power
medium
power
low power
1
Fig 9. Frequency control
2
3
VCTRL
014aab294
7.14 Driver (pin DRIVER)
The driver circuit to the gate of the power MOSFET has a current sourcing capability of
typically 300 mA and a current sink capability of typically 750 mA. This allows for a fast
turn-on and turn-off of the power MOSFET for efficient operation.
7.15 OverTemperature Protection (OTP)
Integrated temperature protection ensures the IC stops switching if the junction
temperature exceeds the thermal shutdown temperature limit.
OTP is a latched protection. It can be reset by removing the voltage on pin VCC.
8. Limiting values
Table 3. Limiting values
In accordance with the Absolute Maximum Rating System (IEC 60134).
Symbol
Parameter
Conditions
Voltages
VCC
supply voltage
continuous
t < 100 ms
VVINSENSE
VPROTECT
VCTRL
VIO(OPTIMER)
voltage on pin VINSENSE current limited
voltage on pin PROTECT current limited
voltage on pin CTRL
input/output voltage on pin
OPTIMER
Min
0.4
-
0.4
0.4
0.4
0.4
Max
+30
35
+5.5
+5
+5.5
+5
Unit
V
V
V
V
V
V
TEA1738FT
Preliminary data sheet
All information provided in this document is subject to legal disclaimers.
Rev. 1 — 30 December 2010
© NXP B.V. 2010. All rights reserved.
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