Datasheet LTC1923 (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | High Efficiency Thermoelectric Cooler Controller |
| Seiten / Seite | 28 / 1 — FEATURES. DESCRIPTIO. High Efficiency, Low Noise Topology. Adjustable … |
| Dateiformat / Größe | PDF / 458 Kb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTIO. High Efficiency, Low Noise Topology. Adjustable Output Slew Rate Reduces EMI
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LTC1923 High Efficiency Thermoelectric
U
Cooler Controller
FEATURES DESCRIPTIO
■
High Efficiency, Low Noise Topology
The LTC®1923 is a pulse width modulator intended for ■
Adjustable Output Slew Rate Reduces EMI
thermoelectric cooler (TEC) or heater applications requir- ■
Full-Bridge Controller for Bidirectional
ing either unidirectional or bidirectional drive circuits. All
Current Control
of the necessary control circuitry and two sets of comple- ■
Adjustable Pulse-by-Pulse Bidirectional TEC
mentary output drivers are integrated into the LTC1923 to
Current Limit
drive a full bridge, providing an efficient means of bidirec- ■
Open/Shorted Thermistor Indication
tional current flow to the TEC. An accurate temperature ■
Solution Footprint in Less Than 0.6"
×
0.8"
control loop to stabilize the temperature of a laser diode
(Double-Sided PCB)
system is easily achieved with the addition of just a few ■
Available in 5mm x 5mm QFN and
external components. Typical temperature setpoint accu-
28-Pin SSOP Packages
racy of 0.1°C is achievable with the LTC1923. Adding an ■ TEC Voltage Clamping instrumentation amplifier front end allows setpoint stabil- ■ TEC Current, Voltage and Heat/Cool Status Outputs ity of 0.01°C. ■ Adjustable/Synchronizable Oscillator Frequency The part features independent adjustable heating and Reduces Filter Component Size and System Noise cooling pulse-by-pulse current limit, current soft-start for ■ 2.5V Reference Voltage Output controlled start-up, output slew rate control to reduce ■ 2.7V Minimum Operating Voltage system noise, differential current sense and voltage am-
U
plifiers and a host of auxiliary circuits to protect the laser
APPLICATIO S
and provide redundant system monitoring. ■ Laser-Based Fiber Optic Links , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Medical Instruments ■ CPU Temperature Regulators
U TYPICAL APPLICATIO Laser Temperature Control Loop Achieving Setpoint Stability of 0.01
°
C
10k 10k 0.1% PLLLPF RT 330pF 82k RSLEW CT + 1µF REF REF V V DD REF LTC2053 VDD SDSYNC VREF A = 10 TMP 10k LTC1658 VOUT – CMD NTC CNTRL PDRVB 10µF 4.7µF EAOUT NDRVB MPA* MPB** 10M L1 L2 100k 10µH COOLER 10µH FB VDD TEC LTC1923 1µF C1 C2 AGND PGND MNB** 22µF 22µF 1µF SS NDRVA MNA* 3 ILIM PDRVA 1 V RS SET CS+ 2 4 FAULT CS– VTHRM ITEC C1, C2: TAIYO YUDEN JMK325BJ226MM-T (X7R) L1, L2: SUMIDA CDRH6D2B-220NC H/C TEC+ *MNA, MPA: SILICONIX Si9801 V 1923 TA01 TEC TEC– **MNB, MPB: SILICONIX Si9801 1923f 1
U
Cooler Controller
FEATURES DESCRIPTIO
■
High Efficiency, Low Noise Topology
The LTC®1923 is a pulse width modulator intended for ■
Adjustable Output Slew Rate Reduces EMI
thermoelectric cooler (TEC) or heater applications requir- ■
Full-Bridge Controller for Bidirectional
ing either unidirectional or bidirectional drive circuits. All
Current Control
of the necessary control circuitry and two sets of comple- ■
Adjustable Pulse-by-Pulse Bidirectional TEC
mentary output drivers are integrated into the LTC1923 to
Current Limit
drive a full bridge, providing an efficient means of bidirec- ■
Open/Shorted Thermistor Indication
tional current flow to the TEC. An accurate temperature ■
Solution Footprint in Less Than 0.6"
×
0.8"
control loop to stabilize the temperature of a laser diode
(Double-Sided PCB)
system is easily achieved with the addition of just a few ■
Available in 5mm x 5mm QFN and
external components. Typical temperature setpoint accu-
28-Pin SSOP Packages
racy of 0.1°C is achievable with the LTC1923. Adding an ■ TEC Voltage Clamping instrumentation amplifier front end allows setpoint stabil- ■ TEC Current, Voltage and Heat/Cool Status Outputs ity of 0.01°C. ■ Adjustable/Synchronizable Oscillator Frequency The part features independent adjustable heating and Reduces Filter Component Size and System Noise cooling pulse-by-pulse current limit, current soft-start for ■ 2.5V Reference Voltage Output controlled start-up, output slew rate control to reduce ■ 2.7V Minimum Operating Voltage system noise, differential current sense and voltage am-
U
plifiers and a host of auxiliary circuits to protect the laser
APPLICATIO S
and provide redundant system monitoring. ■ Laser-Based Fiber Optic Links , LTC and LT are registered trademarks of Linear Technology Corporation. ■ Medical Instruments ■ CPU Temperature Regulators
U TYPICAL APPLICATIO Laser Temperature Control Loop Achieving Setpoint Stability of 0.01
°
C
10k 10k 0.1% PLLLPF RT 330pF 82k RSLEW CT + 1µF REF REF V V DD REF LTC2053 VDD SDSYNC VREF A = 10 TMP 10k LTC1658 VOUT – CMD NTC CNTRL PDRVB 10µF 4.7µF EAOUT NDRVB MPA* MPB** 10M L1 L2 100k 10µH COOLER 10µH FB VDD TEC LTC1923 1µF C1 C2 AGND PGND MNB** 22µF 22µF 1µF SS NDRVA MNA* 3 ILIM PDRVA 1 V RS SET CS+ 2 4 FAULT CS– VTHRM ITEC C1, C2: TAIYO YUDEN JMK325BJ226MM-T (X7R) L1, L2: SUMIDA CDRH6D2B-220NC H/C TEC+ *MNA, MPA: SILICONIX Si9801 V 1923 TA01 TEC TEC– **MNB, MPB: SILICONIX Si9801 1923f 1