Datasheet LTC1871-7 (Analog Devices) - 7
| Fabricante | Analog Devices |
| Descripción | High Input Voltage, Current Mode Boost, Flyback and SEPIC Controller |
| Páginas / Página | 34 / 7 — pin FuncTions. MODE/SYNC (Pin 5):. IN (Pin 9):. SENSE (Pin 10):. GND (Pin … |
| Formato / tamaño de archivo | PDF / 398 Kb |
| Idioma del documento | Inglés |
pin FuncTions. MODE/SYNC (Pin 5):. IN (Pin 9):. SENSE (Pin 10):. GND (Pin 6):. GATE (Pin 7):. INTV. CC (Pin 8):. block DiagraM
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LTC1871-7
pin FuncTions MODE/SYNC (Pin 5):
This input controls the operating voltage. Decouple this pin locally to the IC ground with a mode of the converter and allows for synchronizing the minimum of 4.7µF low ESR tantalum or ceramic capacitor. operating frequency to an external clock. If the MODE/ This 7V regulator has an undervoltage lockout circuit with SYNC pin is connected to ground, Burst Mode operation 5.6V and 4.6V rising and falling thresholds, respectively. is enabled. If the MODE/SYNC pin is connected to INTVCC,
V
or if an external logic-level synchronization signal is ap-
IN (Pin 9):
Main Supply Pin. Must be closely decoupled to ground. plied to this input, Burst Mode operation is disabled and the IC operates in a continuous mode.
SENSE (Pin 10):
The Current Sense Input for the Control Loop. Connect this pin to a resistor in the source of the
GND (Pin 6):
Ground Pin. power MOSFET. Alternatively, the SENSE pin may be con-
GATE (Pin 7):
Gate Driver Output. nected to the drain of the power MOSFET, in applications
INTV
where the maximum VDS is less than 36V. Internal leading
CC (Pin 8):
The Internal 7V Regulator Output. The gate driver and control circuits are powered from this edge blanking is provided for both sensing methods.
block DiagraM
RUN + 1 SLOPE BIAS AND COMPENSATION START-UP C2 CONTROL – 1.248V FREQ VIN 4 V-TO-I OSC 9 0.6V INTV MODE/SYNC I CC OSC GATE PWM LATCH 5 LOGIC 7 85mV+ – OV 50k S 1.230V Q R GND + BURST CURRENT COMPARATOR COMPARATOR + SENSE 0.30V + 10 FB – EA C1 – 3 – gm + 1.230V ITH 2 V-TO-I INTV R CC I LOOP 7V LOOP 8 LDO 1.230V SLOPE 1.230V – UV TO GND START-UP BIAS VREF 6 5.6V UP + CONTROL 18717 BD 4.6V DOWN VIN 18717fd 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts
pin FuncTions MODE/SYNC (Pin 5):
This input controls the operating voltage. Decouple this pin locally to the IC ground with a mode of the converter and allows for synchronizing the minimum of 4.7µF low ESR tantalum or ceramic capacitor. operating frequency to an external clock. If the MODE/ This 7V regulator has an undervoltage lockout circuit with SYNC pin is connected to ground, Burst Mode operation 5.6V and 4.6V rising and falling thresholds, respectively. is enabled. If the MODE/SYNC pin is connected to INTVCC,
V
or if an external logic-level synchronization signal is ap-
IN (Pin 9):
Main Supply Pin. Must be closely decoupled to ground. plied to this input, Burst Mode operation is disabled and the IC operates in a continuous mode.
SENSE (Pin 10):
The Current Sense Input for the Control Loop. Connect this pin to a resistor in the source of the
GND (Pin 6):
Ground Pin. power MOSFET. Alternatively, the SENSE pin may be con-
GATE (Pin 7):
Gate Driver Output. nected to the drain of the power MOSFET, in applications
INTV
where the maximum VDS is less than 36V. Internal leading
CC (Pin 8):
The Internal 7V Regulator Output. The gate driver and control circuits are powered from this edge blanking is provided for both sensing methods.
block DiagraM
RUN + 1 SLOPE BIAS AND COMPENSATION START-UP C2 CONTROL – 1.248V FREQ VIN 4 V-TO-I OSC 9 0.6V INTV MODE/SYNC I CC OSC GATE PWM LATCH 5 LOGIC 7 85mV+ – OV 50k S 1.230V Q R GND + BURST CURRENT COMPARATOR COMPARATOR + SENSE 0.30V + 10 FB – EA C1 – 3 – gm + 1.230V ITH 2 V-TO-I INTV R CC I LOOP 7V LOOP 8 LDO 1.230V SLOPE 1.230V – UV TO GND START-UP BIAS VREF 6 5.6V UP + CONTROL 18717 BD 4.6V DOWN VIN 18717fd 7 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts