LTC1923EGN View Datasheet(PDF) - Linear Technology

Part Name

Description

Manufacturer

LTC1923EGN

High Efficiency Thermoelectric Cooler Controller

Linear Technology 

LTC1923

TYPICAL PERFOR A CE CHARACTERISTICS

Current Limit Threshold

vs Temperature

165

160

155

150

145

140

135

130

125

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

1923 G10

System Power Loss

vs TEC Current

0.7

TA = 25°C

0.6

0.5

0.4

VDD = 5V

0.3

VDD = 3.3V

0.2

0.1

0

0

0.5

1

TEC CURRENT (A)

1923 G11

TEC Clamp Voltage

vs Temperature

2.550

2.530

2.510

2.490

2.470

2.450

–50 –20 10 40 70 100 130

TEMPERATURE (°C)

1923 G12

Representative Waveforms for NDRVA,

NDRVB, TEC Current and CS+ – CS–

CH1: TEC CURRENT (500mA/DIV)

CH2: VOLTAGE ACROSS

0.1Ω SENSE RESISTOR

(CS + – CS –) 100mV/DIV

CH3: NDRVA (5V/DIV)

CH4: NDRVB (5V/DIV)

6

VDD = 5V

RTEC = 2.5Ω

RS = 0.1Ω

1923 G15.tif

Representative Waveforms for

TEC Current, CS+ – CS– and ITEC

CH2: VOLTAGE ACROSS 0.1Ω SENSE

RESISTOR RS (CS + – CS –) 100mV/DIV

CH2

VDD = 5V

RTEC = 2.5Ω

RS = 0.1Ω

CH3: VOLTAGE ON ITEC PIN EQUAL TO

TEN TIMES THE ABSOLUTE VALUE OF

CH2 (200mV/DIV)

CH1: TEC CURRENT (500mA/DIV)

CH1, CH3

1923 G16.tif

1923f

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