Datasheet LT1946A (Linear Technology) - 10
| Manufacturer | Linear Technology |
| Description | 2.7MHz Boost DC/DC Converter with 1.5A Switch and Soft-Start |
| Pages / Page | 12 / 10 — TYPICAL APPLICATIO S. Low Profile (< 1.1mm Tall) Triple Output TFT … |
| Revision | S |
| File Format / Size | PDF / 326 Kb |
| Document Language | English |
TYPICAL APPLICATIO S. Low Profile (< 1.1mm Tall) Triple Output TFT Supply (10V, –10V, 20V). Transient Response. Efficiency
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Text Version of Document
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
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
