TEA1733LT 데이터 시트보기 (PDF) - NXP Semiconductors.

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TEA1733LT

GreenChip III SMPS control IC

NXP Semiconductors. 

NXP Semiconductors

TEA1733T; TEA1733LT

GreenChip III SMPS control IC

7.12 Low power operation

In low power operation switching losses are reduced by lowering the switching frequency.

The converter switching frequency is reduced and the peak current is set to 25 % of the

maximum peak current (see Figure 7 and Figure 10).

fsw

(kHz)

switching

frequency

Fig 10. Frequency control

1

2

VCTRL (V)

014aaa934

7.13 Driver (pin DRIVER)

The driver circuit to the gate of the power MOSFET has a current sourcing capability of

typically −250 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.

7.14 OverTemperature Protection (OTP)

Integrated overtemperature protection ensures the IC stops switching if the junction

temperature exceeds the thermal temperature shutdown limit.

OTP is a latched protection and 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

voltage on pin PROTECT

voltage on pin CTRL

input/output voltage on pin

OPTIMER

current limited

current limited

VISENSE

Currents

voltage on pin ISENSE

current limited

II(VINSENSE)

II(PROTECT)

input current on pin VINSENSE

input current on pin PROTECT

TEA1733T_TEA1733LT_2

Product data sheet

All information provided in this document is subject to legal disclaimers.

Rev. 02 — 26 March 2010

Min

−0.4

-

−0.4

−0.4

−0.4

−0.4

−0.4

−1

−1

Max

Unit

+30

V

35

V

+5.5

V

+5

V

+5

V

+5

V

+5

V

+1

mA

+1

mA

© NXP B.V. 2010. All rights reserved.

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