INTRODUCTION There industry standard telecom swap applications very pr

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AND8168/D SMART HotPlugt Precision UVLO Circuit
INTRODUCTION There industry standard telecom swap applications very precise turn-on turn-off limit undervoltage protection. This sets total limit 1.16% maximum error turn-on voltage. NIS5101 swap device meet this demanding requirement with addition several external components. This solution designed operate over temperature range 85°C, will exceed requirements based worst case analysis.
Specification Circuit Description
Rising ("1.16%) Falling 38.5 ("2.60%) Temperature Range: 85°C
UVLO NIS5101 used enable, pulling inhibit operation pulling high enable operation. external comparator used control this override normal operation internal UVLO circuitry. 2N7002 transistor also driven comparator output. This device adds hysteresis that sets level falling voltage. rising waveform. This done intentionally, that added tolerance those resistors will impact overall tolerance circuit that mode, since that tolerance roughly twice tight that falling waveform. resistor-Zener diode network used provide bias supply this circuit. system voltage available that between used instead eliminate these parts.
resistor/Zener network replaced with power supply with output voltage range Vdc.
Rbias 1.33
50.5 0.25% LM211 UVLO
RVcc
RUVLO Input OVLO NIS5101
dc-dc Converter
Drain Current Limit
UVLO MMSZ33ET1
11.3
Input Optional Time Delay Capacitor
NCV1009D
3.12 0.25%
2N7002
Figure Precision UVLO Circuit
Semiconductor Components Industries, LLC, 2004
October, 2004 Rev.
Publication Order Number: AND8168/D
AND8168/D
Analysis
This analysis calculates worst case variation trip point voltage comparator, based variation reference input offset voltage comparator, overtemperature. then analyzes voltage divider that scales input voltage other comparator input. first section increasing input voltage second decreasing input voltage.
Input Voltage Increasing
Device NCV1009D LM211 Offset Trip Point (Vt) (0.25%) (0.25%) 2.492 -0.004 2.488 50,374 3,128 2.500 0.000 2.500 50,500 3,120 2.508 0.004 2.512 50,625 3,112
resistance 2N7002 which negligible compared 11.3 neglected. worst case value reference, taken maximum value minimum value. voltage inverting input (Vt) comparator reference voltage NCV1009D, reduced voltage divider
Vref
2.238 0.000 2.238 38.500 (eq.
Device Ref. w/hyst. LM211 Offset Trip Point (Vt) Vindecreasing
2.225 -0.004 2.221 37.998
2.249 0.004 2.253 38.895
determine minimum trip voltage, minimum trip point, minimum maximum values used. voltage comparator (Vt) from voltage divider
(eq. (eq.
Bill Materials
Part NCV1009D LM211D 2N7002LT1 MMSZ33ET1 Description Volt Reference Precision Comparator Small Signal Zener Diode Resistor 50.5 0.25% Resistor Semiconductor Semiconductor Semiconductor Semiconductor
Vinincreasing 42.556 43.000
43.376
Input Voltage Decreasing 38.5
Device NCV1009D (1%) (1%) 2.492 1,317 11,187 2.500 1,330 11,300 2.508 1,343 11,413
3.12 0.25% Resistor 1.33 Resistor 11.3 Resistor Resistor Resistor
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AND8168/D

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