Reference DesignAnalog
DC2049A: LT3999 Low Noise Isolated Power Supply Demo Manual
Demonstration circuit for the LT3999 push-pull driver, providing isolated ±12V outputs from a 10V to 15.5V input with low noise via post-regulator LDOs.
Overview
The DC2049A demonstration manual describes an isolated power supply design featuring the LT3999 push-pull DC/DC driver. The circuit regulates dual isolated outputs of +12V and -12V at up to 200mA each from an input range of 10V to 15.5V. It utilizes LT3065 and LT3090 low dropout (LDO) regulators to achieve high noise suppression. Operating at a 1MHz switching frequency, the design emphasizes a small footprint using compact transformers and passive components. The document provides technical specifications, a quick start procedure, efficiency curves, thermal performance images, a complete bill of materials, and a schematic diagram.
Use Cases
- Medical instruments
- Industrial sensing and control
- Data conversion
- Wide band communications
- Noise sensitive systems
Topics
LT3999
LT3065
LT3090
push-pull driver
isolated power supply
DC2049A
low noise
LDO regulator
DC/DC converter
1MHz switching frequency
Referenced Parts
| 06033C104KAT2A | AVX | Cap., X7R 0.1μF 25V 10% 0603 AVX 06033C104KAT2A |
| 06033D105MAT2A | AVX | Cap., X5R 1μF 25V 20% 0603 AVX 06033D105MAT2A |
| 06035C103KAT2A | AVX | Cap., X7R 0.01μF 50V 10% 0603 AVX 06035C103KAT2A |
| 08055A181KAT2A | AVX | Cap., NPO 180pF 50V 10% 0805 AVX 08055A181KAT2A |
| 1206AC222MAT2A | AVX | Cap., X7R 2200pF 1KV 20% 1206 AVX 1206AC222MAT2A |
| CMSH1-200HE | Central Semiconductor | Schottky Diode 200V/1AMP Central Semi. CMSH1-200HE |
| XFL3012-393MEC | Coilcraft | Inductor, 39μH Coilcraft XFL3012-393MEC |
| 2501-2-00-80-00-00-07-0 | Mill-Max | Turret, Testpoint Mill Max 2501-2-00-80-00-00-07-0 |
| 50CE10BSS | Sun Electronic Industries | Cap., Alum 10μF 50V 10% Sun Elect., 50CE10BSS |
| C3216X5R1H106M | TDK | Cap., X5R 10μF 50V 20% 1206 TDK C3216X5R1H106M |
| C3216X7R1E106MT | TDK | Cap., X7R 10μF 25V 20% 1206 TDK C3216X7R1E106MT |
| C3216X7R1E475M | TDK | Cap., X7R 4.7μF 25V 20% 1206 TDK C3216X7R1E475M |
| TMK212BJ475MG-T | Taiyo Yuden | Cap., X5R 4.7μF 25V 20% 0805 Taiyo Yuden TMK212BJ475MG-T |
| CRCW06030000Z0EA | Vishay | Res/Jumper, Chip 0Ω 0.10W 0603 Vishay CRCW06030000Z0EA |
| CRCW060312K1FKEA | Vishay | Res., Chip 12.1k 0.10W 1% 0603 Vishay CRCW060312K1FKEA |
| CRCW060313K3FKEA | Vishay | Res., Chip 13.3k 0.10W 1% 0603 Vishay CRCW060313K3FKEA |
| CRCW0603143KFKEA | Vishay | Res., Chip 143k 0.10W 1% 0603 Vishay CRCW0603143KFKEA |
| CRCW06031M00FKEA | Vishay | Res., Chip 1.00M 0.10W 1% 0603 Vishay CRCW06031M00FKEA |
| CRCW0603243KFKEA | Vishay | Res., Chip 243k 0.10W 1% 0603 Vishay CRCW0603243KFKEA |
| CRCW060349K9FKEA | Vishay | Res., Chip 49.9k 0.10W 1% 0603 Vishay CRCW060349K9FKEA |
| CRCW060352K3FKEA | Vishay | Res., Chip 52.3k 0.10W 1% 0603 Vishay CRCW060352K3FKEA |
| CRCW060386K6FKEA | Vishay | Res., Chip 86.6k 0.10W 1% 0603 Vishay CRCW060386K6FKEA |
| CRCW080539R0JNEA | Vishay | Res., Chip 39Ω 0.125W 5% 0805 Vishay CRCW080539R0JNEA |
| CRCW120610K0JNEA | Vishay | Res., Chip 10k 0.25W 5% 1206 Vishay CRCW120610K0JNEA |
| CRCW121010K0JNEA | Vishay | Res., Chip 10k 0.50W 5% 1210 Vishay CRCW121010K0JNEA |
| 06033C104KAT2A | AVX | 9 2 C3 Cap., X7R 0.1μF 25V 10% 0603 AVX 06033C104KAT2A |
| 06033C104KAT2A | AVX | 2 2 C12 Cap., X7R 0.1μF 25V 10% 0603 AVX 06033C104KAT2A |
| 06033D105MAT2A | AVX | 3 1 C11 Cap., X5R 1μF 25V 20% 0603 AVX 06033D105MAT2A |
| 06035C103KAT2A | AVX | 13 1 C9 Cap., X7R 0.01μF 50V 10% 0603 AVX 06035C103KAT2A |
| 08055A181KAT2A | AVX | 10 1 C4 Cap., NPO 180pF 50V 10% 0805 AVX 08055A181KAT2A |
| 1206AC222MAT2A | AVX | 15 1 C17 Cap., X7R 2200pF 1KV 20% 1206 AVX 1206AC222MAT2A |
| C3216X5R1H106M | TDK | 12 2 C7, C14 Cap., X5R 10μF 50V 20% 1206 TDK C3216X5R1H106M |
| C3216X7R1E106MT | TDK | 14 2 C10, C16 Cap., X7R 10μF 25V 20% 1206 TDK C3216X7R1E106MT |
| C3216X7R1E475M | TDK | 11 1 C5 Cap., X7R 4.7μF 25V 20% 1206 TDK C3216X7R1E475M |
| TMK212BJ475MG-T | Taiyo Yuden | 8 1 C2 Cap., X5R 4.7μF 25V 20% 0805 Taiyo Yuden TMK212BJ475MG-T |
| CRCW06030000Z0EA | Vishay | 1 1 R11 Res/Jumper, Chip 0Ω 0.10W 0603 Vishay CRCW06030000Z0EA |
| CRCW060312K1FKEA | Vishay | 19 1 R7 Res., Chip 12.1k 0.10W 1% 0603 Vishay CRCW060312K1FKEA |
| CRCW060313K3FKEA | Vishay | 20 1 R8 Res., Chip 13.3k 0.10W 1% 0603 Vishay CRCW060313K3FKEA |
| CRCW0603143KFKEA | Vishay | 17 1 R4 Res., Chip 143k 0.10W 1% 0603 Vishay CRCW0603143KFKEA |
| CRCW06031M00FKEA | Vishay | 16 3 R1, R2, R13 Res., Chip 1.00M 0.10W 1% 0603 Vishay CRCW06031M00FKEA |
| CRCW0603243KFKEA | Vishay | 26 1 R17 Res., Chip 243k 0.10W 1% 0603 Vishay CRCW0603243KFKEA |
| CRCW060349K9FKEA | Vishay | 21 1 R9 Res., Chip 49.9k 0.10W 1% 0603 Vishay CRCW060349K9FKEA |
| CRCW060352K3FKEA | Vishay | 24 1 R14 Res., Chip 52.3k 0.10W 1% 0603 Vishay CRCW060352K3FKEA |
| CRCW060386K6FKEA | Vishay | 18 1 R5 Res., Chip 86.6k 0.10W 1% 0603 Vishay CRCW060386K6FKEA |
| CRCW080539R0JNEA | Vishay | 22 1 R10 Res., Chip 39Ω 0.125W 5% 0805 Vishay CRCW080539R0JNEA |
| CRCW120610K0JNEA | Vishay | 25 1 R16 Res., Chip 10k 0.25W 5% 1206 Vishay CRCW120610K0JNEA |
| CRCW121010K0JNEA | Vishay | 23 1 R12 Res., Chip 10k 0.50W 5% 1210 Vishay CRCW121010K0JNEA |
| 112404 | Amphenol Connex | BNC Connector Connex 112404 |
| LT3065EDD#PBF | Linear Technology | I.C., Low Noise Linear Reg. Linear Tech. Corp. LT3065EDD#PBF |
| LT3090EDD#PBF | Linear Technology | I.C., Negative Linear Reg. Linear Tech. Corp. LT3090EDD#PBF |
| LT3999EMSE#PBF | Linear Technology | I.C., Push-Pull DC/DC Driver Linear Tech. Corp. LT3999EMSE#PBF |
| 750314781 | Wurth Elektronik | Xfmr. Würth Elektronik 750314781 |