LTC6801HG-PBF 데이터 시트보기 (PDF) - Linear Technology

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LTC6801HG-PBF

Independent Multicell Battery Stack Fault Monitor

Linear Technology 

APPLICATIONS INFORMATION

PROTECT

AGAINST

BREAKS

HERE

Cn

Cn – 1

6801 F05

Figure 5. Using Fuses and Diodes for Cell Input

Protection (One Cell Connection Shown)

Internal Protection Structure

The LTC6801 incorporates a number of protective struc-

tures, including parasitic diodes, Zener-like overvoltage

suppressors, and other internal features that provide

protection against ESD and certain overstress conditions

that could arise in practice. Figure 6 shows a simplified

internal schematic that indicates the significant protective

structures and their connectivity. The various diodes indi-

cate the approximate current versus voltage characteristics

that are intrinsic to the part, which is useful in analyzing

responses to certain external stresses, such as during a

hot-start scenario.

SELF TEST CIRCUITRY

The LTC6801 has internal circuitry that performs a periodic

self test of all measurement functions. The LTC6801 self

test circuitry is intended to prevent undetectable failure

modes. Accuracy and functionality of the voltage refer-

ence and comparator are verified, as well as functionality

of the high voltage multiplexer and ADC decimation filter.

Additionally, open connections on the cell input pins C1

to C11 are detected (Open connections on V– or C12/V+

will cause an undervoltage failure during the normal

measurement cycle).

LTC6801

V+

LTC6801

C12

C11

C10

ZCLAMP

C9

C8

C7

C6

ZCLAMP

C5

C4

C3

C2

ZCLAMP

C1

V–

EOUT

EOUT

SIN

SIN

SOUT

SOUT

EIN

EIN

VTEMP1

VTEMP2

VREF

VREG

OV1

OV0

UV1

UV0

HYST

CC1

CC0

SLT

SLTOK

DC

6801 F06

Figure 6. Internal Protection Structures

6801fb

17

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