Datasheet LT3952A (Analog Devices)
| Hersteller | Analog Devices |
| Beschreibung | 60V LED Driver with 4A Switch Current |
| Seiten / Seite | 30 / 1 — FEATURES. DESCRIPTION. 4000:1 True Color PWM™ Dimming. 4A, 60V Internal … |
| Revision | A |
| Dateiformat / Größe | PDF / 2.3 Mb |
| Dokumentensprache | Englisch |
FEATURES. DESCRIPTION. 4000:1 True Color PWM™ Dimming. 4A, 60V Internal DMOS Switch. Wide Input Voltage Range: 3V to 42V
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LT3952A 60V LED Driver with 4A Switch Current
FEATURES DESCRIPTION
n
4000:1 True Color PWM™ Dimming
The LT®3952A is a current mode step-up DC/DC converter n
4A, 60V Internal DMOS Switch
with an internal, 60V, 80mΩ DMOS power switch. The n
Wide Input Voltage Range: 3V to 42V
LT3952A is specifically designed to drive high power LEDs n
0V to 60V Output Current Regulation with Monitor
in multiple configurations. It combines input and output n
PMOS Switch Driver for PWM and Output Disconnect
current regulation loops with output voltage regulation to n
LED Short-Circuit Protection and SHORTLED Flag
operate as a flexible current/voltage source. n
Internal Spread Spectrum Frequency Modulation
Programmable switching frequency with optional spread- n Constant-Current and Constant-Voltage Regulation spectrum modulation provides EMI reduction, while still n Input Current Limit and Monitor allowing optimization of the external components for n Adjustable Frequency: 200kHz to 3MHz, efficiency or component size. The LED current is program- Synchronizable to an External Clock mable with an external sense resistor, and can be adjusted n 10:1 Analog Dimming from zero to full scale with a voltage at the CTRL pin. The n Programmable Open-LED Protection with external PWM input provides LED ON/OFF control and OPENLED Flag 4000:1 dimming ratio, and an internal PWM generator n Programmable VIN Undervoltage and delivers the efficiency of PWM dimming to standalone or Overvoltage Lockout I/O limited applications. The LT3952A is available in the n Available in a 28-Lead TSSOP Package thermally enhanced 28-lead TSSOP package.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 7199560, 7321203, 7746300. Patents pending n Display Backlighting n Automotive and Avionic Lighting n Accurate Current-Limited Voltage Regulators
TYPICAL APPLICATION Short-Circuit Robust Boost LED Driver with Spread Spectrum Frequency Modulation
4A INPUT LIMIT 15mΩ 10µH VIN 7V TO 42V
Efficiency vs Input Voltage
4.7µF 2.2µF V 100V 100 IN IVINP IVINN SW ×2 EN/UVLO GND OVLO 1M FB 57V OPEN LED 90 REGULATION 21.5k CTRL VREF LT3952A ISP 80 PWM PWM ISMON ISMON 750mΩ INTVCC DIM EFFICIENCY (%) 100k 100k ISN 70 OPENLED OPENLED TG SSFM OFF SHORTLED SHORTLED INTVCC INTVCC SSFM ON VC SYNC/SPRD 60 3.6k IVINCOMP RT SS 0 10 20 30 40 50 16 LED (50V) V 90.9k 2.2µF 333mA IN (V) 8.2nF 1µF 100nF 3952A TA01b 1MHz 3952A TA01a Rev A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Revision History Typical Application Related Parts
FEATURES DESCRIPTION
n
4000:1 True Color PWM™ Dimming
The LT®3952A is a current mode step-up DC/DC converter n
4A, 60V Internal DMOS Switch
with an internal, 60V, 80mΩ DMOS power switch. The n
Wide Input Voltage Range: 3V to 42V
LT3952A is specifically designed to drive high power LEDs n
0V to 60V Output Current Regulation with Monitor
in multiple configurations. It combines input and output n
PMOS Switch Driver for PWM and Output Disconnect
current regulation loops with output voltage regulation to n
LED Short-Circuit Protection and SHORTLED Flag
operate as a flexible current/voltage source. n
Internal Spread Spectrum Frequency Modulation
Programmable switching frequency with optional spread- n Constant-Current and Constant-Voltage Regulation spectrum modulation provides EMI reduction, while still n Input Current Limit and Monitor allowing optimization of the external components for n Adjustable Frequency: 200kHz to 3MHz, efficiency or component size. The LED current is program- Synchronizable to an External Clock mable with an external sense resistor, and can be adjusted n 10:1 Analog Dimming from zero to full scale with a voltage at the CTRL pin. The n Programmable Open-LED Protection with external PWM input provides LED ON/OFF control and OPENLED Flag 4000:1 dimming ratio, and an internal PWM generator n Programmable VIN Undervoltage and delivers the efficiency of PWM dimming to standalone or Overvoltage Lockout I/O limited applications. The LT3952A is available in the n Available in a 28-Lead TSSOP Package thermally enhanced 28-lead TSSOP package.
APPLICATIONS
All registered trademarks and trademarks are the property of their respective owners. Protected by U.S. patents, including 7199560, 7321203, 7746300. Patents pending n Display Backlighting n Automotive and Avionic Lighting n Accurate Current-Limited Voltage Regulators
TYPICAL APPLICATION Short-Circuit Robust Boost LED Driver with Spread Spectrum Frequency Modulation
4A INPUT LIMIT 15mΩ 10µH VIN 7V TO 42V
Efficiency vs Input Voltage
4.7µF 2.2µF V 100V 100 IN IVINP IVINN SW ×2 EN/UVLO GND OVLO 1M FB 57V OPEN LED 90 REGULATION 21.5k CTRL VREF LT3952A ISP 80 PWM PWM ISMON ISMON 750mΩ INTVCC DIM EFFICIENCY (%) 100k 100k ISN 70 OPENLED OPENLED TG SSFM OFF SHORTLED SHORTLED INTVCC INTVCC SSFM ON VC SYNC/SPRD 60 3.6k IVINCOMP RT SS 0 10 20 30 40 50 16 LED (50V) V 90.9k 2.2µF 333mA IN (V) 8.2nF 1µF 100nF 3952A TA01b 1MHz 3952A TA01a Rev A Document Feedback For more information www.analog.com 1 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Package Description Revision History Typical Application Related Parts