Datasheet LTC3901 (Analog Devices) - 3
| 制造商 | Analog Devices |
| 描述 | Secondary Side Synchronous Driver for Push-Pull and Full-Bridge Converters |
| 页数 / 页 | 16 / 3 — ELECTRICAL CHARACTERISTICS The. denotes specifications which apply over … |
| 文件格式/大小 | PDF / 239 Kb |
| 文件语言 | 英语 |
ELECTRICAL CHARACTERISTICS The. denotes specifications which apply over the full operating
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LTC3901
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range. VCC = 5V, TA = 25
°
C unless otherwise specified. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Characteristics (Note 8)
td SYNC Input to Driver Output Delay CME = CMF = 4700pF, VSYNC = ±5V ● 60 120 ns tr, tf Driver Rise/Fall Time CME = CMF = 4700pF, VSYNC = ±5V 15 ns
Note 1:
Absolute Maximum Ratings are those values beyond which the life will vary with supply voltage, switching frequency and the external of a device may be impaired. MOSFETs used.
Note 2:
The LTC3901E is guaranteed to meet performance specifications
Note 5:
Both CSE+, CSE– and CSF+, CSF– current sense comparators have from 0°C to 70°C. Specifications over the –40°C to 85°C operating the same performance specifications. temperature range are assured by design; characterization and correlation
Note 6:
The current sense comparator threshold has a 0.33%/°C with statistical process controls. temperature coefficient (TC) to match the TC of the external MOSFET
Note 3:
All currents into device pins are positive; all currents out of device RDSON. pins are negative. All voltages are referenced to ground unless otherwise
Note 7:
Guaranteed by design, not subject to test. specified.
Note 8:
Rise and fall times are measured using 10% and 90% levels. Delay
Note 4:
Supply current in normal operation is dominated by the current times are measured from ±1.4V at SYNC input to 20%/80% levels at the needed to charge and discharge the external MOSFET gates. This current driver output.
W U TYPICAL PERFOR A CE CHARACTERISTICS Timeout vs VCC Timeout vs Temperature Timeout vs RTMR
5.25 5.25 10 TA = 25°C V T CC = 5V A = 25°C 5.20 5.20 R R 9 TMR = 51k V TMR = 51k CC = 5V C C C 5.15 TMR = 470pF 5.15 TMR = 470pF 8 TMR = 470pF 5.10 5.10 7 s) s) s) µ 5.05 µ 5.05 µ 6 5.00 5.00 5 4.95 4.95 4 TIMEOUT ( TIMEOUT ( TIMEOUT ( 4.90 4.90 3 4.85 4.85 2 4.80 4.80 1 4.75 4.75 0 4 5 6 7 8 9 10 11 –50 –25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 90 100 VCC (V) TEMPERATURE (°C) RTMR (kΩ) 3901 G01 3901 G02 3901 G03
Current Sense Threshold vs VCS(MAX) Clamp Voltage vs CS+ SYNC Positive Threshold vs Temperature Input Current Temperature
18 18 1.8 17 VCC = 5V, 11V TA = 25°C 16 17 1.7 15 14 16 1.6 13 12 15 1.5 V 11 CC = 11V 10 14 1.4 V 9 CC = 5V CLAMP VOLTAGE (V) 13 1.3 8 7 12 1.2 6 CS(MAX)V SYNC POSITIVE THRESHOLD (V) CURRENT SENSE THRESHOLD (mV) 5 11 1.1 4 3 10 1.0 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 30 –50 –25 0 25 50 75 100 125 TEMPERATURE ( CS+ INPUT CURRENT (mA) °C) TEMPERATURE (°C) 3901 G04 3901 G05 3901 G06 3901f 3
ELECTRICAL CHARACTERISTICS The
●
denotes specifications which apply over the full operating temperature range. VCC = 5V, TA = 25
°
C unless otherwise specified. (Note 3) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Characteristics (Note 8)
td SYNC Input to Driver Output Delay CME = CMF = 4700pF, VSYNC = ±5V ● 60 120 ns tr, tf Driver Rise/Fall Time CME = CMF = 4700pF, VSYNC = ±5V 15 ns
Note 1:
Absolute Maximum Ratings are those values beyond which the life will vary with supply voltage, switching frequency and the external of a device may be impaired. MOSFETs used.
Note 2:
The LTC3901E is guaranteed to meet performance specifications
Note 5:
Both CSE+, CSE– and CSF+, CSF– current sense comparators have from 0°C to 70°C. Specifications over the –40°C to 85°C operating the same performance specifications. temperature range are assured by design; characterization and correlation
Note 6:
The current sense comparator threshold has a 0.33%/°C with statistical process controls. temperature coefficient (TC) to match the TC of the external MOSFET
Note 3:
All currents into device pins are positive; all currents out of device RDSON. pins are negative. All voltages are referenced to ground unless otherwise
Note 7:
Guaranteed by design, not subject to test. specified.
Note 8:
Rise and fall times are measured using 10% and 90% levels. Delay
Note 4:
Supply current in normal operation is dominated by the current times are measured from ±1.4V at SYNC input to 20%/80% levels at the needed to charge and discharge the external MOSFET gates. This current driver output.
W U TYPICAL PERFOR A CE CHARACTERISTICS Timeout vs VCC Timeout vs Temperature Timeout vs RTMR
5.25 5.25 10 TA = 25°C V T CC = 5V A = 25°C 5.20 5.20 R R 9 TMR = 51k V TMR = 51k CC = 5V C C C 5.15 TMR = 470pF 5.15 TMR = 470pF 8 TMR = 470pF 5.10 5.10 7 s) s) s) µ 5.05 µ 5.05 µ 6 5.00 5.00 5 4.95 4.95 4 TIMEOUT ( TIMEOUT ( TIMEOUT ( 4.90 4.90 3 4.85 4.85 2 4.80 4.80 1 4.75 4.75 0 4 5 6 7 8 9 10 11 –50 –25 0 25 50 75 100 125 0 10 20 30 40 50 60 70 80 90 100 VCC (V) TEMPERATURE (°C) RTMR (kΩ) 3901 G01 3901 G02 3901 G03
Current Sense Threshold vs VCS(MAX) Clamp Voltage vs CS+ SYNC Positive Threshold vs Temperature Input Current Temperature
18 18 1.8 17 VCC = 5V, 11V TA = 25°C 16 17 1.7 15 14 16 1.6 13 12 15 1.5 V 11 CC = 11V 10 14 1.4 V 9 CC = 5V CLAMP VOLTAGE (V) 13 1.3 8 7 12 1.2 6 CS(MAX)V SYNC POSITIVE THRESHOLD (V) CURRENT SENSE THRESHOLD (mV) 5 11 1.1 4 3 10 1.0 –50 –25 0 25 50 75 100 125 0 5 10 15 20 25 30 –50 –25 0 25 50 75 100 125 TEMPERATURE ( CS+ INPUT CURRENT (mA) °C) TEMPERATURE (°C) 3901 G04 3901 G05 3901 G06 3901f 3