LTC1923 datasheet(6/28 Pages) LINER

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LTC1923

1923f

TYPICAL PERFOR A CE CHARACTERISTICS

Representative Waveforms for NDRVA,

NDRVB, TEC Current and CS+ – CS–

Representative Waveforms for

TEC Current, CS+ – CS– and ITEC

VDD = 5V

1923 G15.tif

RTEC = 2.5Ω

RS = 0.1Ω

CH1: TEC CURRENT (500mA/DIV)

CH2: VOLTAGE ACROSS

0.1

Ω SENSE RESISTOR

(CS + – CS –) 100mV/DIV

CH3: NDRVA (5V/DIV)

CH4: NDRVB (5V/DIV)

CH2: VOLTAGE ACROSS 0.1

Ω SENSE

RESISTOR RS (CS+ – CS–) 100mV/DIV

CH3: VOLTAGE ON ITEC PIN EQUAL TO

TEN TIMES THE ABSOLUTE VALUE OF

CH2 (200mV/DIV)

CH1: TEC CURRENT (500mA/DIV)

CH1, CH3

CH2

VDD = 5V

1923 G16.tif

RTEC = 2.5Ω

RS = 0.1Ω

System Power Loss

vs TEC Current

TEC Clamp Voltage

vs Temperature

Current Limit Threshold

vs Temperature

TEMPERATURE (

°C)

–50

130

1923 G10

–20

100

165

160

155

150

145

140

135

130

125

TEC CURRENT (A)

0.4

0.5

0.7

1923 G11

0.3

0.2

0.5

0.1

0.6

VDD = 5V

VDD = 3.3V

TA = 25°C

TEMPERATURE (

°C)

–50

130

1923 G12

–20

100

2.550

2.530

2.510

2.490

2.470

2.450

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