TL7733BCD

更新时间： 2024-01-29 03:59:59

品牌	Logo	应用领域
德州仪器 - TI		/
页数	文件大小	规格书
15页	329K
描述
SUPPLY-VOLTAGE SUPERVISORS

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数据手册

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TL7733BCD 数据手册

TL7702B, TL7705B, TL7733B

SUPPLY-VOLTAGE SUPERVISORS

The TL7705BM is obsolete

and no longer is supplied.

SLVS037M – SEPTEMBER 1989 – REVISED MAY 2003

APPLICATION INFORMATION

System Supply

10 kΩ

RESET

To System

RESET

SENSE

Reset Input

(from system)

RESIN

REF

To System

RESET

GND

(see text)

10 kΩ

0.1 µF

Figure 8. System Reset Controller With Undervoltage Sensing

When the TL770xB SENSE terminal is used to monitor V , a current-limiting resistor in series with C is

recommended. During normal operation, the timing capacitor is charged by the onboard current source to

approximately V or an internal voltage clamp (≈7.1-V Zener), whichever is less. When the circuit then is subjected

to an undervoltage condition during which V

is rapidly slewed down, the voltage on CT exceeds that on V . This

forward biases a secondary path internally, which falsely activates the outputs. A fault is indicated when V

drops

below V

, not when V

falls below V

(CT)

SENSE

T–

Texas Instruments performs a 100% electrical screen to verify that the outputs do not switch with 1 mA forced into

the CT terminal. Adding the external resistor, R , prevents false triggering. Its value is calculated as follows:

V₍

V_T

–

)

R_T

Where:

= V

or 7.1 V, whichever is less

(CT)

T–

= 4.55 V (nom)

= value of series resistor required

For V

= 5 V:

4.55

R_T

1 mA

Therefore,

R_T

450

Using a 20%-tolerance resistor, R should be greater than 560 Ω.

Adding this series resistor changes the duration of the reset pulse by no more than 10%. R extends the discharge

of C , but also skews the V

threshold. These effects tend to cancel one another. The precise percentage change

(CT)

can be derived theoretically, but the equation is complicated by this interaction and is dependent upon the duration

of the supply-voltage fault condition.

Both outputs of the TL770xB should be terminated with similar value resistors, even when only one is being used.

This prevents unwanted plateauing in either output waveform during switching, which may be interpreted as an

undefined state or delay system reset.

POST OFFICE BOX 655303 • DALLAS, TEXAS 75265

1...6 7 8910 11 12...15

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