ISL612XSEQEVAL1Z【PDF 17/23 页】EVALUATION BOARD ISL612XSEQ

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Sheet目录1222

13页 14页 15页 16页 [17页]18页 19页 20页 21页

ISL6123, ISL6124, ISL6125, ISL6126, ISL6127, ISL6128, ISL6130

TABLE 3. ISL6125EVAL1Z COMPONENT LISTING

COMPONENT

DESIGNATOR

U1

R6

R12

R1

R11

R2

R3

R4

R5

R9

C5

C9

C2

C8

C3

C7

C4

C6

C1

D1

R8

R9

R10

R13

COMPONENT FUNCTION

ISL6125, Four Supply Sequencer

5V to UVLO_A Resistor for Divider String

UVLO_A to GND Resistor for Divider String

3.3V to UVLO_B Resistor for Divider String

UVLO_B to GND Resistor for Divider String

2.5V to UVLO_D Resistor for Divider String

UVLO_D to GND Resistor for Divider String

1.5V to UVLO_C Resistor for Divider String

UVLO_D to GND Resistor for Divider String

RESET LED Current Limiting Resistor

5V turn-on Delay Capacitor A

5V turn-off Delay Capacitor A (135ms)

3.3V turn-on Delay Capacitor B (13.7ms)

3.3V turn-off Delay Capacitor B (13.7ms)

2.5V turn-on Delay Capacitor D (28ms)

2.5V turn-off Delay Capacitor D

1.5V turn-on Delay Capacitor C (98ms)

1.5V turn-off Delay Capacitor C (59ms)

Decoupling Capacitor

RESET1 Indicating LED

SEQ_OUTPUT_A Pull-Up Resistor

SEQ_OUTPUT_B Pull-Up Resistor

SEQ_OUTPUT_C Pull-Up Resistor

SEQ_OUTPUT_D Pull-Up Resistor

COMPONENT DESCRIPTION

Intersil, ISL6125, Four Supply Sequencer with Open Drain Outputs

8.45k Ω 1%, 0402

1.47k Ω 1%, 0402

7.68k Ω 1%, 0402

2.26k Ω 1%, 0402

6.98k Ω 1%, 0402

3.01k Ω 1%, 0402

4.99k Ω 1%, 0402

4.99k Ω 1%, 0402

750 Ω 10%, 0805

DNP, 0402

0.1μF 10%, 6.3V, 0402

0.01μF 10%, 6.3V, 0402

0.01μF 10%, 6.3V, 0402

0.022μF 10%, 6.3V, 0402

DNP, 0402

0.068μF 10%, 6.3V, 0402

0.047μF 10%, 6.3V, 0402

0.1μF, 0805

0805, SMD LED

10 k Ω , 0402

10 k Ω , 0402

10 k Ω , 0402

10 k Ω , 0402

Application Implementations

Multiple Sequencer Implementations

The ISL6123, ISL6124, ISL6125 and ISL6127 devices can be

configured to control sequencing of more than four voltages. A

particular configuration may be preferable to another, depending

on concerns. The fundamental questions to determine which

configuration is best suited for your applications are:

1. What level of voltage assurance is needed prior to sequencing

on, and can the voltage supplies be grouped into high and low

criticality?

2. Is there a critical maximum time window in which all supplies

must be present at load, or is there a first and a second group

preference, possibly with some work done in between the two

groups of voltages being present?

17

Three configurations are described and illustrated here.

In applications for which the integrity of critical voltages must be

assured prior to sequencing, additional monitoring of the critical

supplies is needed. If voltage compliance is critical for either

undervoltage or overvoltage, voltage supervisors can be used to

provide this additional assurance across multiple sequencers.

Figure 19 is a block diagram of a voltage-compliant,

high-assurance, low-risk configuration showing the ISL6131 or

ISL6132 supervisor and a mix of FET switched outputs and logic

output sequencers (ISL6124 and ISL6125 ICs).

FN9005.12

September 26, 2012

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相关代理商/技术参数

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