Datasheet LTC7862 (Analog Devices) - 10
| Hersteller | Analog Devices |
| Beschreibung | 140V High Efficiency Switching Surge Stopper |
| Seiten / Seite | 32 / 10 — PIN FUNCTIONS (QFN/TSSOP) DRVUV (Pin 16/Pin 18):. OVLO (Pin 18/Pin 20):. … |
| Dateiformat / Größe | PDF / 1.7 Mb |
| Dokumentensprache | Englisch |
PIN FUNCTIONS (QFN/TSSOP) DRVUV (Pin 16/Pin 18):. OVLO (Pin 18/Pin 20):. SENSE+ (Pin 19/Pin 1):. INTVCC (Pin 17/Pin 19):
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LTC7862
PIN FUNCTIONS (QFN/TSSOP) DRVUV (Pin 16/Pin 18):
DRVCC Regulation and UVLO
OVLO (Pin 18/Pin 20):
Overvoltage Lockout Input. A Program Pin. This pin sets the regulated output voltage voltage on this pin above 1.2V disables switching of of the DRVCC linear regulator. Tying this pin to GND sets the controller. The DRVCC and INTVCC supplies maintain DRVCC to 6.0V. Tying this pin to INTVCC sets DRVCC to regulation during an OVLO event. Exceeding the OVLO 9V. This pin also determines the higher or lower DRVCC threshold triggers a soft-start reset. If the OVLO function UVLO and EXTVCC switchover thresholds, as listed on is not used, connect this pin to GND. the Electrical Characteristics table. Connecting DRVUV to
SENSE+ (Pin 19/Pin 1):
The (+) Input to the Differential GND chooses the lower thresholds whereas tying DRVUV Current Comparator. The ITH pin voltage and controlled to INTVCC chooses the higher thresholds. Do not float offsets between the SENSE– and SENSE+ pins in conjunc- this pin. tion with RSENSE set the current trip threshold.
INTVCC (Pin 17/Pin 19):
Output of the Internal 5V Low
SENSE– (Pin 20/Pin 2):
The (–) Input to the Differential Dropout Regulator. Many of the low voltage analog and Current Comparator. When SENSE– is greater than INTV digital circuits are powered from this voltage source. A CC, the SENSE– pin supplies power to the current comparator. low ESR 0.1µF ceramic bypass capacitor should be con- nected between INTVCC and GND, as close as possible to the LTC7862.
TIMING DIAGRAM
VIN SURGE IN VIN SURGE GOES A IN W SURGE GOES A A W Y A SWITCHING TG 40µA PULL-UP CURRENT 1.1µA PULL-DOWN CURRENT 1.1 2.19V TMR (NOT TO SCALE) 250mV 0V COOLDOWN SWITCHING OFF SWITCHING OFF DROPOUT WARNB W 7862 TD Rev 0 10 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS TIMING DIAGRAM FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS
PIN FUNCTIONS (QFN/TSSOP) DRVUV (Pin 16/Pin 18):
DRVCC Regulation and UVLO
OVLO (Pin 18/Pin 20):
Overvoltage Lockout Input. A Program Pin. This pin sets the regulated output voltage voltage on this pin above 1.2V disables switching of of the DRVCC linear regulator. Tying this pin to GND sets the controller. The DRVCC and INTVCC supplies maintain DRVCC to 6.0V. Tying this pin to INTVCC sets DRVCC to regulation during an OVLO event. Exceeding the OVLO 9V. This pin also determines the higher or lower DRVCC threshold triggers a soft-start reset. If the OVLO function UVLO and EXTVCC switchover thresholds, as listed on is not used, connect this pin to GND. the Electrical Characteristics table. Connecting DRVUV to
SENSE+ (Pin 19/Pin 1):
The (+) Input to the Differential GND chooses the lower thresholds whereas tying DRVUV Current Comparator. The ITH pin voltage and controlled to INTVCC chooses the higher thresholds. Do not float offsets between the SENSE– and SENSE+ pins in conjunc- this pin. tion with RSENSE set the current trip threshold.
INTVCC (Pin 17/Pin 19):
Output of the Internal 5V Low
SENSE– (Pin 20/Pin 2):
The (–) Input to the Differential Dropout Regulator. Many of the low voltage analog and Current Comparator. When SENSE– is greater than INTV digital circuits are powered from this voltage source. A CC, the SENSE– pin supplies power to the current comparator. low ESR 0.1µF ceramic bypass capacitor should be con- nected between INTVCC and GND, as close as possible to the LTC7862.
TIMING DIAGRAM
VIN SURGE IN VIN SURGE GOES A IN W SURGE GOES A A W Y A SWITCHING TG 40µA PULL-UP CURRENT 1.1µA PULL-DOWN CURRENT 1.1 2.19V TMR (NOT TO SCALE) 250mV 0V COOLDOWN SWITCHING OFF SWITCHING OFF DROPOUT WARNB W 7862 TD Rev 0 10 For more information www.analog.com Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS TIMING DIAGRAM FUNCTIONAL DIAGRAM OPERATION APPLICATIONS INFORMATION TYPICAL APPLICATIONS PACKAGE DESCRIPTION TYPICAL APPLICATION RELATED PARTS