LTC1923 LINER [Linear Technology], LTC1923 Datasheet - Page 6

• Manufacturer Part Number: LTC1923
• Description: High Efficiency Thermoelectric Cooler Controller
• Manufacturer: LINER [Linear Technology]

LTC1923
TYPICAL PERFOR A CE CHARACTERISTICS
6
165
160
155
150
145
140
135
130
125
–50
Current Limit Threshold
vs Temperature
–20
TEMPERATURE ( C)
10
40
70
W
100
1923 G10
U
130
0.7
0.6
0.4
0.2
0.1
0.5
0.3
0
Representative Waveforms for NDRVA,
NDRVB, TEC Current and CS
Representative Waveforms for
TEC Current, CS
V
R
R
V
R
R
0
System Power Loss
vs TEC Current
DD
TEC
S
DD
TEC
S
T
= 0.1
A
= 0.1
= 5V
= 5V
= 25 C
= 2.5
= 2.5
TEC CURRENT (A)
V
DD
+
0.5
= 5V
– CS
–
V
and ITEC
DD
= 3.3V
+
1923 G16.tif
1923 G15.tif
– CS
1923 G11
1
–
CH2: VOLTAGE ACROSS 0.1 SENSE
RESISTOR R
CH3: VOLTAGE ON I
TEN TIMES THE ABSOLUTE VALUE OF
CH2 (200mV/DIV)
CH1: TEC CURRENT (500mA/DIV)
CH1: TEC CURRENT (500mA/DIV)
CH2: VOLTAGE ACROSS
0.1 SENSE RESISTOR
(CS
CH3: NDRVA (5V/DIV)
CH4: NDRVB (5V/DIV)
CH2
CH1, CH3
+
– CS
2.550
2.530
2.510
2.490
2.470
2.450
–
) 100mV/DIV
S
(CS
–50
TEC Clamp Voltage
vs Temperature
+
– CS
TEC
PIN EQUAL TO
–20
–
) 100mV/DIV
TEMPERATURE ( C)
10
40
70
100
1923 G12
130
1923f