Datasheet LTC3721-1 (Analog Devices) - 4
| Fabricante | Analog Devices |
| Descripción | Push-Pull PWM Controller |
| Páginas / Página | 16 / 4 — ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply … |
| Formato / tamaño de archivo | PDF / 189 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS The. denotes the specifications which apply over the full operating
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LTC3721-1
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = 9.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SSR Soft-Start Reset Threshold Measured on SS 0.7 0.4 0.1 V FLT Fault Reset Threshold Measured on SS 4.5 4.2 3.5 V
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 5:
The LTC3721–1 is guaranteed to meet performance specifications of a device may be impaired. from 0°C to 85°C. Specifications over the –40°C to 85°C operating
Note 2:
Includes leading edge blanking delay, R temperature range are assured by design, characterization and correlation LEB = 20k, not tested in production. with statistical process controls.
Note 3:
FB is driven by a servo loop amplifier to control V
Note 6:
This IC includes overtemperature protection that is intended to COMP for these tests. protect the device during momentary overload conditions. Junction
Note 4:
Set FB to –0.3V, 2.5V and insure that COMP does not phase invert. temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.
W U TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25
°
C unless otherwise noted) Oscillator Frequency vs Start-Up ICC vs VCC VCC vs ISHUNT Temperature
200 10.50 260 CT = 270pF 150 10.25 250 A) µ (V) ( 100 10.00 240 CC I CC V FREQUENCY (kHz) 50 9.75 230 0 9.50 220 0 2 4 6 8 10 0 10 20 30 40 50 – 60 – 40 – 20 0 20 40 60 80 100 VCC (V) ISHUNT (mA) TEMPERATURE (°C) 372311 G01 372311 G02 372311 G03
Leading Edge Blanking Time vs RLEB VREF vs IREF VREF vs Temperature
350 5.05 5.01 300 TJ = 25°C 5.00 5.00 250 TJ = 85°C 4.95 200 (V) (V) 4.99 REF REF 150 V V 4.90 BLANK TIME (ns) T 100 J = –40°C 4.98 4.85 50 0 4.80 4.97 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 – 60 – 40 – 20 0 20 40 60 80 100 RLEB (kΩ) IREF (mA) TEMPERATURE (°C) 372311 G04 372311 G05 372311 G06 sn37211 37211fs 4
ELECTRICAL CHARACTERISTICS The
●
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25
°
C. VCC = 9.5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
SSR Soft-Start Reset Threshold Measured on SS 0.7 0.4 0.1 V FLT Fault Reset Threshold Measured on SS 4.5 4.2 3.5 V
Note 1:
Absolute Maximum Ratings are those values beyond which the life
Note 5:
The LTC3721–1 is guaranteed to meet performance specifications of a device may be impaired. from 0°C to 85°C. Specifications over the –40°C to 85°C operating
Note 2:
Includes leading edge blanking delay, R temperature range are assured by design, characterization and correlation LEB = 20k, not tested in production. with statistical process controls.
Note 3:
FB is driven by a servo loop amplifier to control V
Note 6:
This IC includes overtemperature protection that is intended to COMP for these tests. protect the device during momentary overload conditions. Junction
Note 4:
Set FB to –0.3V, 2.5V and insure that COMP does not phase invert. temperature will exceed 125°C when overtemperature protection is active. Continuous operation above the specified maximum operating junction temperature may impair device reliability.
W U TYPICAL PERFOR A CE CHARACTERISTICS (TA = 25
°
C unless otherwise noted) Oscillator Frequency vs Start-Up ICC vs VCC VCC vs ISHUNT Temperature
200 10.50 260 CT = 270pF 150 10.25 250 A) µ (V) ( 100 10.00 240 CC I CC V FREQUENCY (kHz) 50 9.75 230 0 9.50 220 0 2 4 6 8 10 0 10 20 30 40 50 – 60 – 40 – 20 0 20 40 60 80 100 VCC (V) ISHUNT (mA) TEMPERATURE (°C) 372311 G01 372311 G02 372311 G03
Leading Edge Blanking Time vs RLEB VREF vs IREF VREF vs Temperature
350 5.05 5.01 300 TJ = 25°C 5.00 5.00 250 TJ = 85°C 4.95 200 (V) (V) 4.99 REF REF 150 V V 4.90 BLANK TIME (ns) T 100 J = –40°C 4.98 4.85 50 0 4.80 4.97 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 30 35 40 – 60 – 40 – 20 0 20 40 60 80 100 RLEB (kΩ) IREF (mA) TEMPERATURE (°C) 372311 G04 372311 G05 372311 G06 sn37211 37211fs 4