LT3581IMSE-TRPBF データシートの表示（PDF） - Linear Technology

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LT3581IMSE-TRPBF

3.3A Boost/Inverting DC/DC Converter with Fault Protection

Linear Technology 

STATE DIAGRAM

SHDN < 1.33V (TYPICAL)

or

VIN < 2.3V (TYPICAL)

CHIP OFF

• ALL SWITCHES DISABLED

• IGATE OFF

• FAULTS CLEARED

SHDN > 1.33V (TYPICAL)

AND

VIN > 2.3V (TYPICAL)

INITIALIZE

• SS PULLED LOW

FAULT1

SS < 50mV

SOFT START

• IGATE ENABLED

• SS CHARGES UP

• SWITCHER ENABLED

FAULT1

SAMPLE MODE

• Q1 & Q2 SWITCHES

FORCED ON EVERY CYCLE

FOR AT LEAST MINIMUM

ON TIME

• IGATE FULLY ACTIVATED

WHEN SS > 500mV

FAULT1

IF |VOUT| DROPS CAUSING:

FB < 1.17V (BOOST)

OR

FB > 45mV (INVERTING)

NORMAL MODE

• NORMAL OPERATION

• CLKOUT ENABLED WHEN

SS > 1.8V

FAULT1

LT3581

FAULT2

FAULT DETECTED

• SS CHARGES UP

• IGATE OFF

• FAULT PIN PULLED LOW

INTERNALLY BY LT3581

• SWITCHER DISABLED

• CLKOUT DISABLED

SS > 1.8V AND

NO FAULT1 CONDITIONS

STILL DETECTED

POST FAULT DELAY

• SS SLOWLY DISCHARGES

FAULT1

SS < 50mV

LOCAL FAULT OVER

• INTERNAL FAULT PIN PULLDOWN

RELEASED BY LT3581

• SS CONTINUES DISCHARGING

TO GND

FAULT PIN > 1.0V

FAULT1

FAULT1 = OVER VOLTAGE PROTECTION ON VIN (VIN > 22V MIN)

OVER TEMPERATURE (TJUNCTION > 165°C)

OVER CURRENT ON SW1 (ISW1 > 1.9A MIN)

OVER VOLTAGE PROTECTION ON SW1 (VSW1 > 42V MIN)

OVER VOLTAGE PROTECTION ON SW2 (VSW2 > 42V MIN)

FAULT2 = FAULT PULLED LOW EXTERNALLY (FAULT < 0.75V)

3581 SD

Figure 2. State Diagram

For more information www.linear.com/LT3581

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