TC54VN4401EMBRT [MICROCHIP]

1-CHANNEL POWER SUPPLY SUPPORT CKT, PSSO3, SOT-89, 3 PIN;


型号：	TC54VN4401EMBRT
厂家：	MICROCHIP
描述：	1-CHANNEL POWER SUPPLY SUPPORT CKT, PSSO3, SOT-89, 3 PIN
文件：	总5页 (文件大小：222K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AN2

Using the Microchip TC54 Voltage Detector

INTRODUCTION

OPERATION

Microchip's TC54 series of voltage detectors are designed to

supersede a variety of discrete comparator circuits and bipolar

technology voltage detectors.

The TC54 equivalent circuit is shown in Figure 1. The internal

precision temperature-compensated reference and comparator

circuit consistently monitor V_INfor an under-voltage condition.

When such a condition occurs, the output is forced to the active

(LOW) state and remains there until V_INis once again within

tolerance. As shown in the timing diagram of Figure 1, the output

is forced active when V_IN< (–V_DET) (Where (–V_DET) is the threshold

voltage) and returns HIGH when V_INexceeds (–V_DET) plus 5%

hysteresis (example: if (–V_DET) = 2.0V, the output will go HIGH

when V_IN> 2.1V).

These voltage detectors are especially suited for application in

battery powered systems because of their extremely low 1µA

operatingcurrent.Eachpartislaserprogrammedtothedesiredtrip

point voltage over the range of 1.1V to 6.0V in 100mV steps. For

complete design flexibility, complementary or open-drain output

versions are available. TC54 package options include surface

mount SOT-23A and SOT-89 or through-hole TO-92 types.

TC54VC only

Input Voltage

Release

Voltage

Hysteresis

Voltage

(+V_DET

)

Detect Voltage (–V_DET

)

V_IN

Minimum Operating Voltage

Ground Level

V_OUT

–

Output Voltage

Ground Level

V_REF

V_SS

FIGURE 1: TC54 block diagram and timing.

TC54 AS A MICROCONTROLLER

RESET GENERATOR

V_IN

Reset generators external to the microcontroller are necessary in

systems that have slowly rising power supplies. It is necessary to

hold the microcontroller in its reset state until the power supply has

reached a valid operating level. Commonly used simple Schmitt

trigger/capacitor circuits are inadequate since they do not

accurately monitor the power supply voltage tolerance. The TC54

series overcomes this problem with precise voltage detection.

Figure 2 shows a reset circuit using a TC54 replacing bipolar

integrated voltage detectors (see Table 1).

V_IN

TC54VC

V_SS

MCLR

V_OUT

PIC

Microcontroller

100

FIGURE 2: Microcontroller reset circuit using TC54.

DS00779A-page 1

AN2

MICROCHIP

PART#

MFGR

MICROCHIP #

DESCRIPTION

ATTRIBUTE

Motorola

T.I.

MC33064P-5

MC34064P-5

MC34164P-3

MC34164P-5

MC33164P-3

MC33164P-5

TL7757ILP

TC54VN4502EZB

TC54VN2702EZB

TC54VN4302EZB

TC54VN2702EZB

TC54VN4302EZB

TC54VN4502EZB

4.5V trip, –40 to +85C, TO-92

4.5V trip, 0 to +70C, TO-92

2.7V trip, 0 to +70C, TO-92

4.3V trip, 0 to +70C, TO-92

2.7V trip, –40 to +85C, TO-92

4.3V trip, –40 to +85C, TO-92

4.5V trip, –40 to +85C, TO-92

4.5V trip, 0 to +70C, TO-92

500 times less power

10 times less power

2000 times less power

T.I.

TL7757CLP

Table 1: TC54 cross reference listing.

MODIFYING THE TRIP POINT, –V_DET

Although the TC54 has a pre-programmed –V_DET, it is sometimes

necessary to make adjustments during prototyping. This can be

accomplished by connecting an external resistor divider to a TC54

which has a –V_DETlower than that of V_SOURCE(Figure 3).

To maintain detector accuracy, the bleeder current through the

divider should be significantly higher than the 1µA operating

current required by the TC54. A reasonable value for this bleeder

current is 100µA (100 times the 1µA required by the TC54). For

example, if –V_DET= 2V and the desired trip point is 2.5V, the value

of R1 + R2 is 25kΩ (2.5V/100µA). The value of R1 + R2 can be

rounded to the nearest standard value and plugged into the

equation of Figure 3 to calculate values for R1 and R2. 1%

tolerance resistors are recommended.

V_SOURCE

R1 + R2

V_SOURCE

= (–V_DET)

(

)

Where:

V_IN

V_OUT

TC54

V_SOURCE= Voltage to be monitored

(–V_DET) = Threshold Voltage Setting of TC54

V_SS

Note:In this example, V_SOURCEmust be greater than (–V_DET

)

Figure 3: Modify trip point of TC54 using external resistor divider.

DS00779A-page 2

AN2

4.3V

V_CC

270

V_IN

V_OUT

Pwr

Sply

Power Good

TC54Vx

V_OUT

TC54VN

V_SS

MTP3055EL

V_SS

Figure 4: MOSFET low drive protection.

Figure 6: Power good monitor.

OTHER APPLICATIONS

LowoperatingpowerandsmallphysicalsizemaketheTC54series

ideal for many voltage detector applications, such as those shown

in Figures 4, 5 and 6. Figure 4 shows a low-voltage gate drive

protection circuit, which prevents overheating of the logic-level

MOSFET due to insufficient gate voltage. When the input signal is

below the threshold of the TC54VN, its output grounds the gate of

the MOSFET. Figures 5 and 6 show the TC54 in conventional

voltage monitoring applications.

V_IN

TC54Vx

V_OUT

BATLOW

V_SS

Figure 5: Battery voltage monitor.

DS00779A-page 3

AN2

Information contained in this publication regarding device

applications and the like is intended through suggestion only

and may be superseded by updates. It is your responsibility to

ensure that your application meets with your specifications.

No representation or warranty is given and no liability is

assumed by Microchip Technology Incorporated with respect

to the accuracy or use of such information, or infringement of

patents or other intellectual property rights arising from such

use or otherwise. Use of Microchip’s products as critical com-

ponents in life support systems is not authorized except with

express written approval by Microchip. No licenses are con-

veyed, implicitly or otherwise, under any intellectual property

rights.

Trademarks

The Microchip name and logo, the Microchip logo, PIC, PICmicro,

PICMASTER, PICSTART, PRO MATE, KEELOQ, SEEVAL,

MPLAB and The Embedded Control Solutions Company are reg-

istered trademarks of Microchip Technology Incorporated in the

U.S.A. and other countries.

Total Endurance, ICSP, In-Circuit Serial Programming, Filter-

Lab, MXDEV, microID, FlexROM, fuzzyLAB, MPASM,

MPLINK, MPLIB, PICC, PICDEM, PICDEM.net, ICEPIC,

Migratable Memory, FanSense, ECONOMONITOR, Select

Mode and microPort are trademarks of Microchip Technology

Incorporated in the U.S.A.

Serialized Quick Term Programming (SQTP) is a service mark

of Microchip Technology Incorporated in the U.S.A.

All other trademarks mentioned herein are property of their

respective companies.

Printed on recycled paper.

Microchip received QS-9000 quality system

certification for its worldwide headquarters,

design and wafer fabrication facilities in

Chandler and Tempe, Arizona in July 1999. The

Company’s quality system processes and

procedures are QS-9000 compliant for its

PICmicro 8-bit MCUs, KEELOQ^®code hopping

devices, Serial EEPROMs and microperipheral

products. In addition, Microchip’s quality

system for the design and manufacture of

development systems is ISO 9001 certified.

DS00779A-Page 4

 2001 Microchip Technology Inc

AN2

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06/01/01

DS00779A-page 5

TC54VN4401EMBRT [MICROCHIP]

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