Datasheet LT1946A (Linear Technology) - 10

LT1946A
U TYPICAL APPLICATIO S Low Profile (< 1.1mm Tall) Triple Output TFT Supply (10V, –10V, 20V)
D2 D3 VON 20V 5mA C5 0.1µF L1 1.5µH D1 A V VDD IN 10V 5V 6 5 475mA VIN SW R1 3 75k OFF ON SHDN 8 2 SS LT1946A FB + 7 C2 C3 C1 COMP 20 4.7µF µF 1µF VC GND* 1 4 R2 CSS RC 10.5k 100nF 59k CC 150pF C6 C1–C6: X5R or X7R 0.1µF C1: 4.7µF, 6.3V D4 C2: 2 C4 × 10µF, 10V C3: 1 2.2 µF, 25V µF C4: 2.2µF, 10V D5 C5–C6: 0.1µF, 10V VOFF D1: MICROSEMI UPS120 OR EQUIVALENT –10V D2–D5: ZETEX BAT54S OR EQUIVALENT 10mA L1: COILCRAFT LP01704-152MC 1946A TA02 * EXPOSED PAD MUST ALSO BE GROUNDED
Transient Response Efficiency
90 85 AVDD 50mV/DIV 80 AC COUPLED 75 70 ILI 0.5A/DIV EFFICIENCY (%) 65 60 V 55 ON LOAD = 5mA VOFF LOAD = 10mA 350mA AVDD LOAD 50 200mA 0 100 200 300 400 500 100µs/DIV 1946A TA03 AVDD LOAD CURRENT (mA) 1946A TA04 sn1946a 1946afs 10