Linear Technology LTC1923EUH, TEC Temperature Controller, 1.0MHz Switching Frequency, 2.7-5.5V Input DC491A DC491A 数据表

1

LTC1923

1923f

High Efficiency Thermoelectric

Cooler Controller

■

■

■

■

■

■

×

■

■

TEC Voltage Clamping

■

TEC Current, Voltage and Heat/Cool Status Outputs

■

Adjustable/Synchronizable Oscillator Frequency
Reduces Filter Component Size and System Noise

■

2.5V Reference Voltage Output

■

2.7V Minimum Operating Voltage

, LTC and LT are registered trademarks of Linear Technology Corporation.

■

Laser-Based Fiber Optic Links

■

Medical Instruments

■

CPU Temperature Regulators

°

The LTC

®

1923 is a pulse width modulator intended for

thermoelectric cooler (TEC) or heater applications requir-
ing either unidirectional or bidirectional drive circuits. All
of the necessary control circuitry and two sets of comple-
mentary output drivers are integrated into the LTC1923 to
drive a full bridge, providing an efficient means of bidirec-
tional current flow to the TEC. An accurate temperature
control loop to stabilize the temperature of a laser diode
system is easily achieved with the addition of just a few
external components. Typical temperature setpoint accu-
racy of 0.1

°

C is achievable with the LTC1923. Adding an

instrumentation amplifier front end allows setpoint stabil-
ity of 0.01

°

C.

The part features independent adjustable heating and
cooling pulse-by-pulse current limit, current soft-start for
controlled start-up, output slew rate control to reduce
system noise, differential current sense and voltage am-
plifiers and a host of auxiliary circuits to protect the laser
and provide redundant system monitoring.

4

3

2

1

PLLLPF

R

SLEW

SDSYNC

CNTRL

EAOUT

FB

AGND

SS

I

LIM

V

SET

FAULT

V

THRM

H/C

V

TEC

R

T

C

T

V

REF

PDRVB

NDRVB

V

DD

PGND

NDRVA

PDRVA

CS

+

CS

–

I

TEC

TEC

+

TEC

–

LTC1923

V

DD

–

+

LTC2053

A = 10

REF

LTC1658

REF

10k

0.1%

10k

NTC

V

OUT

TMP

CMD

330pF

1

µ

F

10

µ

F

L1

10

µ

H

V

DD

R

S

C1, C2: TAIYO YUDEN JMK325BJ226MM-T (X7R)
L1, L2: SUMIDA CDRH6D2B-220NC
*MNA, MPA: SILICONIX Si9801
**MNB, MPB: SILICONIX Si9801

1923 TA01

4.7

µ

F

1

µ

F

10M

100k

10k

1

µ

F

L2

10

µ

H

C1

22

µ

F

C2
22

µ

F

MPA*

V

REF

MPB**

MNA*

MNB**

TEC

COOLER

82k