Datasheet LT1575, LT1577 (Analog Devices) - 14
| Hersteller | Analog Devices |
| Beschreibung | Ultrafast Transient Response, Low Dropout Regulators Adjustable and Fixed |
| Seiten / Seite | 20 / 14 — TYPICAL APPLICATIONS N. Setting Output Voltage with the Adjustable … |
| Dateiformat / Größe | PDF / 320 Kb |
| Dokumentensprache | Englisch |
TYPICAL APPLICATIONS N. Setting Output Voltage with the Adjustable LT1575. Using “Sense-Less” Current Limit
Modelllinie für dieses Datenblatt
- LT1575CN8#PBF LT1575CN8#PBF LT1575CN8-1.5#PBF LT1575CN8-1.5#PBF LT1575CN8-2.8#PBF LT1575CN8-2.8#PBF LT1575CN8-3.3#PBF LT1575CN8-3.3#PBF LT1575CN8-3.5#PBF LT1575CN8-3.5#PBF LT1575CN8-5#PBF LT1575CN8-5#PBF LT1575CS8#PBF LT1575CS8#PBF LT1575CS8#TRPBF LT1575CS8#TRPBF LT1575CS8-1.5#PBF LT1575CS8-1.5#PBF LT1575CS8-2.8#PBF LT1575CS8-2.8#PBF LT1575CS8-3.3#PBF LT1575CS8-3.3#PBF LT1575CS8-3.5#PBF LT1575CS8-3.5#PBF LT1575CS8-5#PBF LT1575CS8-5#PBF
Textversion des Dokuments
LT1575/LT1577
U TYPICAL APPLICATIONS N Setting Output Voltage with the Adjustable LT1575 Using “Sense-Less” Current Limit
VOUT R3 10Ω SHDN IPOS VCC R2 C1 CT 10µF FB INEG R1 GATE Q1 VOUT = 1.21V(1 + R2/R1) VOUT 1575 TA03 1575 TA04
Setting Current Limit Setting Current Limit with Foldback Limiting
IPOS VCC IPOS VCC R R5 SENSE* R4 10Ω INEG INEG D1 GATE Q2 1N4148 D2 1N4148 V Q3 GATE OUT R6 *I 1.2k LIM = 50mV/RSENSE R V SENSE = DISCRETE SHUNT RESISTOR OR OUT 1575 TA06 RSENSE = KELVIN-SENSED PC BOARD TRACE ACTIVATING CURRENT LIMIT ALSO ACTIVATES THE SHDN PIN TIMER 1575 TA05
Shutdown Time-Out with Reset Basic Thermal Shutdown
SHDN 5V RESET Q1 RT1 0V TO 5V VN2222L 10k R1 C1* NTC 100k SHDN RT1 = DALE NTHS-1206N02 THERMALLY MOUNT RT1 *C1 = 15µA(t)/1.11V R4 IN CLOSE PROXIMITY t = SHUTDOWN LATCHOFF TIME 1575 TA07 549Ω TO THE EXTERNAL N-CHANNEL MOSFET 1575 TA08
Shutdown Time-Out with Reset Overvoltage Protection
R2 SHDN VOUT 100k RESET Q2 0V TO 5V 2N3904 R6 R3 C2* 100k SHDN R5 *C2 = 15µA(t)/1.11V t = SHUTDOWN LATCH-OFF TIME 1575 TA10 1575 TA09 VOUT(uth) = 1.21(R6/R5) + 5µA(R6) VOUT(lth) = 1.11(R6/R5) – 15µA(R6) 14
U TYPICAL APPLICATIONS N Setting Output Voltage with the Adjustable LT1575 Using “Sense-Less” Current Limit
VOUT R3 10Ω SHDN IPOS VCC R2 C1 CT 10µF FB INEG R1 GATE Q1 VOUT = 1.21V(1 + R2/R1) VOUT 1575 TA03 1575 TA04
Setting Current Limit Setting Current Limit with Foldback Limiting
IPOS VCC IPOS VCC R R5 SENSE* R4 10Ω INEG INEG D1 GATE Q2 1N4148 D2 1N4148 V Q3 GATE OUT R6 *I 1.2k LIM = 50mV/RSENSE R V SENSE = DISCRETE SHUNT RESISTOR OR OUT 1575 TA06 RSENSE = KELVIN-SENSED PC BOARD TRACE ACTIVATING CURRENT LIMIT ALSO ACTIVATES THE SHDN PIN TIMER 1575 TA05
Shutdown Time-Out with Reset Basic Thermal Shutdown
SHDN 5V RESET Q1 RT1 0V TO 5V VN2222L 10k R1 C1* NTC 100k SHDN RT1 = DALE NTHS-1206N02 THERMALLY MOUNT RT1 *C1 = 15µA(t)/1.11V R4 IN CLOSE PROXIMITY t = SHUTDOWN LATCHOFF TIME 1575 TA07 549Ω TO THE EXTERNAL N-CHANNEL MOSFET 1575 TA08
Shutdown Time-Out with Reset Overvoltage Protection
R2 SHDN VOUT 100k RESET Q2 0V TO 5V 2N3904 R6 R3 C2* 100k SHDN R5 *C2 = 15µA(t)/1.11V t = SHUTDOWN LATCH-OFF TIME 1575 TA10 1575 TA09 VOUT(uth) = 1.21(R6/R5) + 5µA(R6) VOUT(lth) = 1.11(R6/R5) – 15µA(R6) 14