Datasheet ADP1621 (Analog Devices) - 8
| Manufacturer | Analog Devices |
| Description | Constant-Frequency, Current-Mode Step-Up DC-to-DC Controller |
| Pages / Page | 32 / 8 — ADP1621. Data Sheet. TYPICAL PERFORMANCE CHARACTERISTICS. 100. LOAD = … |
| File Format / Size | PDF / 788 Kb |
| Document Language | English |
ADP1621. Data Sheet. TYPICAL PERFORMANCE CHARACTERISTICS. 100. LOAD = 0.5A. ) %. LOAD = 1A. FFI E. TA = 25°C. fSW = 220kHz. A = 25°C
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ADP1621 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 100 92 90 91 LOAD = 0.5A 80 90 ) % ) ( % 89 LOAD = 1A Y ( C 70 Y N C IE N 88 C IE 60 C FFI E FFI E 87 50 TA = 25°C 86 fSW = 220kHz 40 T V A = 25°C IN = 3.3V V V 85 IN = 3.3V OUT = 5V VOUT = 5V 30 84 0.01 0.1 1 10
004
100 300 500 700 900 1100 1300 1500
007
LOAD CURRENT (A)
06090-
SWITCHING FREQUENCY (kHz)
06090- Figure 5. Efficiency vs. Load Current Figure 8. Efficiency vs. Switching Frequency
100 TA = 25°C V V IN = 3.3V OUT RIPPLES @ 5V 10 V AC-COUPLED OUT = 5V LOAD = 1A IIN A) 1 (m 1 0.1 IPIN CURRENT Y 0.01 L PP U S 0.001 0.0001 TA = 25°C 2 NO SWITCHING CH2 = GATE 0.00001
005
0 1 2 3 4 5 6 7
008
CH1 20mV CH2 2V M2µs A CH2 2.6V
6090-
SUPPLY VOLTAGE (V)
0 06090- Figure 6. Output Voltage Ripple of the Circuit Shown in Figure 1 Figure 9. Supply Current vs. Supply Voltage
1.21605 2.5 T T A = 25°C A = 25°C VIN = 5V 1.21600 2.0 1.21595 ) ) 1.5 (V (V P 1.21590 FB M V COV 1.0 1.21585 0.5 1.21580 1.21575 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
06 09 -0
1.17 1.19 1.21 1.23 1.25 1.27 1.29
-0
V
090 090
IN (V) V
06
FB (V)
06 Figure 7. VFB vs. VIN Figure 10. VCOMP vs. VFB Rev. D | Page 8 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL LOOP CURRENT-SENSE CONFIGURATIONS CURRENT LIMIT UNDERVOLTAGE LOCKOUT SHUTDOWN SOFT START INTERNAL SHUNT REGULATORS SETTING THE OSCILLATOR FREQUENCY AND SYNCHRONIZATION FREQUENCY APPLICATION INFORMATION: BOOST CONVERTER ADIsimPower DESIGN TOOL DUTY CYCLE SETTING THE OUTPUT VOLTAGE INDUCTOR CURRENT RIPPLE INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION DIODE SELECTION MOSFET SELECTION LOOP COMPENSATION SLOPE COMPENSATION CURRENT LIMIT LIGHT LOAD OPERATION Discontinuous Conduction Mode Pulse-Skipping Modulation RECOMMENDED COMPONENT MANUFACTURERS LAYOUT CONSIDERATIONS EFFICIENCY CONSIDERATIONS EXAMPLES OF APPLICATION CIRCUITS STANDARD BOOST CONVERTER—DESIGN EXAMPLE BOOTSTRAPPED BOOST CONVERTER Low Input and High Output Boost Converter High Input Voltage Boost Converter Circuit SEPIC CONVERTER CIRCUIT LOW VOLTAGE POWER-INPUT CIRCUIT LED DRIVER APPLICATION CIRCUITS RELATED DEVICES OUTLINE DIMENSIONS ORDERING GUIDE
ADP1621 Data Sheet TYPICAL PERFORMANCE CHARACTERISTICS 100 92 90 91 LOAD = 0.5A 80 90 ) % ) ( % 89 LOAD = 1A Y ( C 70 Y N C IE N 88 C IE 60 C FFI E FFI E 87 50 TA = 25°C 86 fSW = 220kHz 40 T V A = 25°C IN = 3.3V V V 85 IN = 3.3V OUT = 5V VOUT = 5V 30 84 0.01 0.1 1 10
004
100 300 500 700 900 1100 1300 1500
007
LOAD CURRENT (A)
06090-
SWITCHING FREQUENCY (kHz)
06090- Figure 5. Efficiency vs. Load Current Figure 8. Efficiency vs. Switching Frequency
100 TA = 25°C V V IN = 3.3V OUT RIPPLES @ 5V 10 V AC-COUPLED OUT = 5V LOAD = 1A IIN A) 1 (m 1 0.1 IPIN CURRENT Y 0.01 L PP U S 0.001 0.0001 TA = 25°C 2 NO SWITCHING CH2 = GATE 0.00001
005
0 1 2 3 4 5 6 7
008
CH1 20mV CH2 2V M2µs A CH2 2.6V
6090-
SUPPLY VOLTAGE (V)
0 06090- Figure 6. Output Voltage Ripple of the Circuit Shown in Figure 1 Figure 9. Supply Current vs. Supply Voltage
1.21605 2.5 T T A = 25°C A = 25°C VIN = 5V 1.21600 2.0 1.21595 ) ) 1.5 (V (V P 1.21590 FB M V COV 1.0 1.21585 0.5 1.21580 1.21575 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
06 09 -0
1.17 1.19 1.21 1.23 1.25 1.27 1.29
-0
V
090 090
IN (V) V
06
FB (V)
06 Figure 7. VFB vs. VIN Figure 10. VCOMP vs. VFB Rev. D | Page 8 of 32 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION TYPICAL APPLICATION CIRCUIT TABLE OF CONTENTS REVISION HISTORY SIMPLIFIED BLOCK DIAGRAM SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS THEORY OF OPERATION CONTROL LOOP CURRENT-SENSE CONFIGURATIONS CURRENT LIMIT UNDERVOLTAGE LOCKOUT SHUTDOWN SOFT START INTERNAL SHUNT REGULATORS SETTING THE OSCILLATOR FREQUENCY AND SYNCHRONIZATION FREQUENCY APPLICATION INFORMATION: BOOST CONVERTER ADIsimPower DESIGN TOOL DUTY CYCLE SETTING THE OUTPUT VOLTAGE INDUCTOR CURRENT RIPPLE INDUCTOR SELECTION INPUT CAPACITOR SELECTION OUTPUT CAPACITOR SELECTION DIODE SELECTION MOSFET SELECTION LOOP COMPENSATION SLOPE COMPENSATION CURRENT LIMIT LIGHT LOAD OPERATION Discontinuous Conduction Mode Pulse-Skipping Modulation RECOMMENDED COMPONENT MANUFACTURERS LAYOUT CONSIDERATIONS EFFICIENCY CONSIDERATIONS EXAMPLES OF APPLICATION CIRCUITS STANDARD BOOST CONVERTER—DESIGN EXAMPLE BOOTSTRAPPED BOOST CONVERTER Low Input and High Output Boost Converter High Input Voltage Boost Converter Circuit SEPIC CONVERTER CIRCUIT LOW VOLTAGE POWER-INPUT CIRCUIT LED DRIVER APPLICATION CIRCUITS RELATED DEVICES OUTLINE DIMENSIONS ORDERING GUIDE
