LT1990 Linear Technology, LT1990 Datasheet - Page 14

• Manufacturer Part Number: LT1990
• Description: Difference Amplifier
• Manufacturer: Linear Technology

APPLICATIO S I FOR ATIO
LT1990
14
C1, C2, C3: TAIYO YUDEN JMK325BJ226MM-T (X7R)
L1, L2: SUMIDA CDRH6D2B-220NC
*MNA, MPA: SILICONIX Si9801
**MNB, MPB: SILICONIX Si9801
V
V
IN
IN
100k
100k
20k
–
+
I
COIL
(i.e. ±1A FOR ±1V)
= (V
3
2
U
+
–
IN
1
LT1990
+ – V
REF
V
4
7
DD
IN
U
)/(10 • R
5
8
G2
G1
6
S
)
Figure 2. PWM-Based ±1A Electromagnet Current Controller
W
10k
10k
10nF
100k
100k
V
1µF
82k
10nF
DD
U
PLLLPF
R
SDSYNC
CNTRL
EAOUT
FB
AGND
SS
I
V
FAULT
V
H/C
V
LIM
SLEW
SET
THRM
TEC
LTC1923
NDRVB
NDRVA
PDRVB
PDRVA
PGND
TEC
TEC
V
V
CS
CS
I
REF
TEC
R
DD
C
T
T
+
–
+
–
V
REF
1µF
330pF
1µF
10k
MNB**
MPA*
10µH
L1
22µF
0.1
C1
V
DD
22µF
C3
10µF
0.1
R
C2
22µF
10µH
S
L2
I
COIL
ELECTRO-
MAGNET
COIL
MPB**
MNA*
1990 F02
1990f