SLLSEP9H September   2015  – July 2019 SN6505A , SN6505B

PRODUCTION DATA.  

  1. Features
  2. Applications
  3. Description
    1.     Device Images
      1.      Simplified Schematic
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics, SN6505A
    8. 6.8 Typical Characteristics, SN6505B
  7. Parameter Measurement Information
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Push-Pull Converter
      2. 8.3.2 Core Magnetization
    4. 8.4 Device Functional Modes
      1. 8.4.1 Start-Up Mode
        1. 8.4.1.1 Soft-Start
      2. 8.4.2 Operating Mode
      3. 8.4.3 Shutdown-Mode
      4. 8.4.4 Spread Spectrum Clocking
      5. 8.4.5 External Clock Mode
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Drive Capability
        2. 9.2.2.2 LDO Selection
        3. 9.2.2.3 Diode Selection
        4. 9.2.2.4 Capacitor Selection
        5. 9.2.2.5 Transformer Selection
          1. 9.2.2.5.1 V-t Product Calculation
          2. 9.2.2.5.2 Turns Ratio Estimate
          3. 9.2.2.5.3 Recommended Transformers
      3. 9.2.3 Application Curves
      4. 9.2.4 System Examples
        1. 9.2.4.1 Higher Output Voltage Designs
        2. 9.2.4.2 Application Circuits
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Third-Party Products Disclaimer
    2. 12.2 Documentation Support
      1. 12.2.1 Related Documentation
    3. 12.3 Related Links
    4. 12.4 Receiving Notification of Documentation Updates
    5. 12.5 Community Resources
    6. 12.6 Trademarks
    7. 12.7 Electrostatic Discharge Caution
    8. 12.8 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

Recommended Transformers

Depending on the application, use the minimum configuration in Figure 46 or standard configuration in Figure 47.

SN6505A SN6505B Figure45_SLLSEP9_Q1.pngFigure 46. Unregulated Output for Low-Current Loads With Wide Supply Range
SN6505A SN6505B Figure46_sllsep9_Q1.pngFigure 47. Regulated Output for Stable Supplies and High Current Loads

The Wurth Electronics Midcom isolation transformers in Table 3 are optimized designs for the device, providing high efficiency and small form factor at low-cost.

The 1:1.1 and 1:1.7 turns-ratios are designed for logic applications with wide supply rails and low load currents. These applications operate without LDO, thus achieving further cost-reduction.

Table 3. Recommended Isolation Transformers Optimized for the Device

TURNS
RATIO
V × T
(Vμs)
ISOLATION
(VRMS)
DIMENSIONS
(mm)
APPLICATION LDO(1) ORDER NO. MANUFACTURER
1:1.1 ±2% 7 2500 6.73 x 10.05 x 4.19 3.3 V → 3.3 V, 100mA, SN6505B
Refer to Figure 13 and Figure 14
No 760390011 Wurth Electronics / Midcom
1:1.1 ±2% 11 5 V → 5 V, 100mA, SN6505B
Refer to Figure 15 and Figure 16
760390012
1:1.7 ±2% 3.3 V → 5 V, 100mA, SN6505B
Refer to Figure 17 and Figure 18
760390013
1:1.3 ±2% 3.3 V → 3.3 V, 100mA, SN6505B
Refer to Figure 19 and Figure 20
Yes 760390014
1:1.3 ±2% 5 V → 5 V, 100mA, SN6505B
Refer to Figure 21 and Figure 22
760390014
1:2.1 ±2% 3.3 V → 5 V, 100mA, SN6505B
Refer to Figure 23 and Figure 24
760390015
1.23:1 ±2% 5 V → 3.3 V, 100mA, SN6505B 750313710
1:1.7 ±2% 8.9 8.3 x 12.6 x 4.1 3.3 V → 3.3 V, 1A, SN6505B
Refer to Figure 25 and Figure 26
750316028
1:2.1 ±2% 3.3 V → 5 V, 1A, SN6505B
Refer to Figure 27 and Figure 28
No 750316029
1.3:1 ±2% 10.8 5 V → 3.3 V, 1A, SN6505B
Refer to Figure 29 and Figure 30
750316030
1:1.1 ±2% 8.6 3.3 V → 3.3 V , 1A , SN6505B
5 V → 5 V , 1A , SN6505B
Refer to Figure 11 and Figure 12
750315371
1:1.1 ±2% 11 5000 9.14 x 12.7 x 7.37 3.3 V → 3.3 V, 100mA, SN6505B 750313734
1:1.1 ±2% 5 V → 5 V, 100mA, SN6505B 750313734
1:1.7 ±2% 3.3 V → 5 V, 100mA, SN6505B 750313769
1:1.3 ±2% 3.3 V → 3.3 V, 100mA, SN6505B
5 V → 5 V, 100mA, SN6505B
Yes 750313638
1:2.1 ±2% 3.3 V → 5 V, 100mA, SN6505B 750313626
1.3:1 ±2% 5 V → 3.3 V, 100mA , SN6505B No 750313638
1:1.75 ±2% 41 12.32 x 15.41 x 11.05 3.3 V → 3.3 V, 1A, SN6505A
Refer to Figure 3 and Figure 4
Yes 750316031
1:2 ±2% 3.3 V → 5 V, 1A, SN6505A
Refer to Figure 5 and Figure 6
No 750316032
1.3:1 ±2% 42 5.0 V → 3.3 V, 1A, SN6505A
Refer to Figure 7 and Figure 8
750316033
1:1.1 ±2% 23 12.32 x 15.41 x 11.89 3.3 V → 3.3 V, 1A, SN6505A
5 V → 5 V, 1A , SN6505A
Refer to Figure 1 and Figure 2
750315240
1:1.3 ±3% 11 5000 10.4 x 12.2 x 6.1 3.3 V → 3.3 V, 300mA, SN6505B
5 V → 5 V, 300mA , SN6505B
No HCT-SM-1.3-8-2 Bourns
1:1.1 ±2% 9.2 2500 7.01 x 11 x 4.19 3.3 V → 3.3 V, 150mA, SN6505B
5 V → 5 V, 150mA , SN6505B
No EPC3668G-LF PCA Electronics
1:1.5 ±3% 34.4 2500 10 x 12.07 x 5.97 3.3 V → 3.3 V, 1A, SN6505A/B
5 V → 5 V, 1A , SN6505A/B
Yes DA2303-AL Coilcraft
1:2.2 ±3% 21.5 2500 10 x 12.07 x 5.97 3.3 V → 5 V, 1A, SN6505A/B DA2304-AL
For configurations with LDO, a higher voltage than the required output voltage is generated, to allow for LDO drop-out. Figures show the voltage and efficiency at the LDO input.