Datasheet

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