Datasheet LT1072 - 6

LT1072
W U TYPICAL PERFOR A CE CHARACTERISTICS Transconductance of Error Amplifier VC Pin Characteristics Switch “Off” Characteristics
7000 –30 300 1000 V 6000 0 FB = 1.5V (CURRENT INTO VC PIN) 900 θ 200 800 5000 30 µmho) A) 100 A) µ µ 700 VSUPPLY = 55V 4000 60 PHASE ( V 0 T 600 SUPPLY = 40V G J = 25°C m VSUPPLY = 15V 3000 90 500 ° V ) –100 SUPPLY = 3V 2000 120 400 PIN CURRENT ( CV –200 300 1000 150 V SWITCH CURRENT ( FB = 0.8V (CURRENT OUT OF VC PIN) TRANSCONDUCTANCE ( 200 0 180 –300 100 –1000 210 –400 0 1k 10k 100k 1M 10M 0 0.5 1.0 1.5 2.0 2.5 0 10 20 30 40 50 60 70 80 90 100 FREQUENCY (Hz) VC PIN VOLTAGE (V) SWITCH VOLTAGE (V) LT1072 • TPC19 LT1072 • TPC20 LT1072 • TPC21
W BLOCK DIAGRA
SWITCH V OUT IN 16V 2.3V REG FLYBACK ERROR AMP 40kHz LOGIC DRIVER OSC MODE ANTI- SELECT SAT COMP FB – ERROR VC AMP + + SHUTDOWN CURRENT 0.16Ω 0.16Ω CIRCUIT AMP – GAIN ≈ 6 E1* E2 1.24V 0.15V * ALWAYS CONNECT E1 TO GROUND PIN ON MINIDIP AND SURFACE MOUNT REF PACKAGES. EMITTERS TIED TO GROUND ON TO-3 AND TO-220 PACKAGES GND LT1072 • BD01 1072fc 6