Datasheet
26
LTC1923
1923f
V
DD
PLLLPF
R
SLEW
SDSYNC
CNTRL
EAOUT
FB
AGND
SS
I
LIM
V
SET
FAULT
V
THRM
H/C
V
TEC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
1
2
3
4
5
6
7
8
9
10
11
12
13
14
R
T
C
T
V
REF
PDRVB
NDRVB
V
DD
PGND
NDRVA
PDRVA
CS
+
CS
–
I
TEC
TEC
+
TEC
–
U1
LTC1923EGN
V
DD
–
+
U3
LTC2053IMS8
8
4
U2
LTC1658IMS8
14 BIT
REF
V
OUT
C5 330pF
C6 1µF
L1 10µH
TEC–TEC+
L2 10µH
V
DD
R15
0.1Ω
0.5W 1%
C2, C3, C4, C7, C8: AVX 0603YC104KAT1A (X7R, 16V)
C5: AVX 06035A331KAT1A (NPO, 50V)
C6, C14, C18, C19: AVX 06036D105KAT2A (X5R, 6.3V)
C9: TAIYO YUDEN JMK316BJ106ML-T (X7R, 6.3V)
C10, C11: PANASONIC ECP-U1C104MA5 (SM FILM, 16V)
C13: AVX TAJA475M020R (TANTALUM, 20V)
C15, C16, C17: TAIYO YUDEN JMK325BJ226MM-T (X7R, 6.3V)
D3 (OPTIONAL): PANASONIC LN1251-C-TR (RED)
D4 (OPTIONAL): PANASONIC LN1851-C-TR (ORANGE)
D5 (OPTIONAL): PANASONIC LN1351-C-TR (GREEN)
L1, L2: SUMIDA CDRH6D28-100NC
Q1, Q2: SILICONIX Si9801DY
Q3, Q4, Q5, Q6 (OPTIONAL): 2N7002
R3: KOA RN73T2AT1002B O.1%
R15: KOA SR73H2ER100F
ALL RESISTORS 5% TOLERANCE UNLESS NOTED
R10, R13, C13 MAY NEED TO BE CHANGED TO ACHIEVE DESIRED LOOP RESONSE
1923 TA02
C14
1µF
R14
1k 1%
R1 10k
V
CC
GNDD
OUT
CLK
D
IN
CS/LD
CLK
D
IN
CS/LD
C18 1µF
V
SET
C15
22µF
6.3V
C8
0.1µF
C17
22µF
6.3V
TEC
V
SET
V
DD
Q1
Si9801DY
R7
10k 1%
68
1
2
7
3
3
2
R13
100k 1%
R20
100k
R4 82k
C13
4.7µF
20V
+
10k
NTC+
RT1
THERMISTOR
10k NTC
NTC–
C7
0.1µF
Q2
Si9801DY
Q3
2N7002
V
DD
V
DD
C16
22µF 6.3V
1
5
6
7
C10
0.1µF
SM FILM
C19
1µF
V
SET
V
DD
V
SET
R9
9.09K
1%
R10
10M
1%
0.1µF
C4
0.1µF
C3
0.1µF
54
V
DD
C2
0.1µF
C11
0.1µF
SM
FILM
R20
100k
Q4
2N7002
V
DD
R19
200Ω
FAULT
D3
LED (RED)
R23
100k
Q6
2N7002
V
DD
V
DD
R26
100k
Q5
2N7002
OPTIONAL FOR VISUAL HEATING/COOLING INDICATION
V
DD
R27
200Ω
COOL
D5
LED (GRN)
V
DD
R25
200Ω
HEAT
D4
LED (ORN)
OPTIONAL FOR VISUAL FAULT INDICATION
R3
10k
0.1%
C9
10µF
6.3V
Laser Temperature Control Loop Achieving Set Point Stability of 0.01°C
TYPICAL APPLICATIO
U