Datasheet TEA1501 (NXP) - 10
| Manufacturer | NXP |
| Description | GreenChip SMPS controller IC in 8-SOIC (0.295", 7.50mm Width) Package |
| Pages / Page | 21 / 10 — Philips Semiconductors. TEA1501. GreenChip SMPS controller IC. Fig 7. AUX … |
| File Format / Size | PDF / 116 Kb |
| Document Language | English |
Philips Semiconductors. TEA1501. GreenChip SMPS controller IC. Fig 7. AUX current as a function of counter state
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Philips Semiconductors TEA1501 GreenChip SMPS controller IC
IAUX (mA) I 6.7 AUX(high) 1.7 IAUX(low) Ndata 28 56 112 counter state mgm825
Fig 7. AUX current as a function of counter state 7.4 Design Equations 7.4.1 Primary peak current
The primary peak current is determined by the sense resistor RSOURCE and may be calculated as shown below: V detect R = --------- SOURCE I prim
7.4.1.1 Minimum value of RSOURCE
The maximum drain current is 0.25 A, this results in a minimum value for resistor RSOURCE of 2.0 Ω.
7.4.2 Switch oscillator
The maximum output power of the converter is a function of the switching frequency, provided that the converter operates in discontinuous conduction mode. 2 P = × - × L × I × f out (max) η 12 p prim switch Where η is the efficiency, Lp is the primary inductance, Iprim is the primary peak current and fswitch is the switching frequency. The switching frequency can be adjusted between 20 kHz and 50 kHz by the reference resistor RREF: 1 f = ------------------- switch k × R switch REF
7.4.2.1 Range of RREF values
The minimum value for resistor RREF is 24 kΩ, the maximum value is 62 kΩ. TEA1501_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 02 — 31 March 2006 10 of 21
Document Outline 1. General description 2. Features 2.1 Distinctive features 2.2 Green features 2.3 Protection features 3. Quick reference data 4. Ordering information 5. Block diagram 6. Pinning information 6.1 Pinning 6.2 Pin description 7. Functional description 7.1 System operation 7.1.1 On/off 7.1.2 Start-up 7.1.3 Operation 7.1.4 Data transfer 7.2 Waveforms in the Off mode, Start-up mode and Operation mode 7.3 Circuit block description 7.3.1 On/off/data section 7.3.2 VAUX management 7.3.3 Start-up current source 7.3.4 Reference block 7.3.5 Temperature protection 7.3.6 Switch oscillator 7.3.7 Burst oscillator 7.3.8 Gate driver 7.3.9 Power switch 7.3.10 Primary current comparator 7.3.11 Leading edge blanking 7.3.12 Modulator 7.3.13 Counter 7.3.14 Supply current tracking 7.4 Design Equations 7.4.1 Primary peak current 7.4.1.1 Minimum value of RSOURCE 7.4.2 Switch oscillator 7.4.2.1 Range of RREF values 7.4.3 Leading edge blanking 7.4.4 Burst oscillator 7.4.4.1 Minimum value of CBURST 8. Limiting values 9. Thermal characteristics 10. Characteristics 11. Test information 11.1 Quality information 12. Package outline 13. Soldering 13.1 Introduction to soldering surface mount packages 13.2 Reflow soldering 13.3 Wave soldering 13.4 Manual soldering 13.5 Package related soldering information 14. Revision history 15. Legal information 15.1 Data sheet status 15.2 Definitions 15.3 Disclaimers 15.4 Trademarks 16. Contact information 17. Contents
IAUX (mA) I 6.7 AUX(high) 1.7 IAUX(low) Ndata 28 56 112 counter state mgm825
Fig 7. AUX current as a function of counter state 7.4 Design Equations 7.4.1 Primary peak current
The primary peak current is determined by the sense resistor RSOURCE and may be calculated as shown below: V detect R = --------- SOURCE I prim
7.4.1.1 Minimum value of RSOURCE
The maximum drain current is 0.25 A, this results in a minimum value for resistor RSOURCE of 2.0 Ω.
7.4.2 Switch oscillator
The maximum output power of the converter is a function of the switching frequency, provided that the converter operates in discontinuous conduction mode. 2 P = × - × L × I × f out (max) η 12 p prim switch Where η is the efficiency, Lp is the primary inductance, Iprim is the primary peak current and fswitch is the switching frequency. The switching frequency can be adjusted between 20 kHz and 50 kHz by the reference resistor RREF: 1 f = ------------------- switch k × R switch REF
7.4.2.1 Range of RREF values
The minimum value for resistor RREF is 24 kΩ, the maximum value is 62 kΩ. TEA1501_2 © Koninklijke Philips Electronics N.V. 2006. All rights reserved.
Product data sheet Rev. 02 — 31 March 2006 10 of 21
Document Outline 1. General description 2. Features 2.1 Distinctive features 2.2 Green features 2.3 Protection features 3. Quick reference data 4. Ordering information 5. Block diagram 6. Pinning information 6.1 Pinning 6.2 Pin description 7. Functional description 7.1 System operation 7.1.1 On/off 7.1.2 Start-up 7.1.3 Operation 7.1.4 Data transfer 7.2 Waveforms in the Off mode, Start-up mode and Operation mode 7.3 Circuit block description 7.3.1 On/off/data section 7.3.2 VAUX management 7.3.3 Start-up current source 7.3.4 Reference block 7.3.5 Temperature protection 7.3.6 Switch oscillator 7.3.7 Burst oscillator 7.3.8 Gate driver 7.3.9 Power switch 7.3.10 Primary current comparator 7.3.11 Leading edge blanking 7.3.12 Modulator 7.3.13 Counter 7.3.14 Supply current tracking 7.4 Design Equations 7.4.1 Primary peak current 7.4.1.1 Minimum value of RSOURCE 7.4.2 Switch oscillator 7.4.2.1 Range of RREF values 7.4.3 Leading edge blanking 7.4.4 Burst oscillator 7.4.4.1 Minimum value of CBURST 8. Limiting values 9. Thermal characteristics 10. Characteristics 11. Test information 11.1 Quality information 12. Package outline 13. Soldering 13.1 Introduction to soldering surface mount packages 13.2 Reflow soldering 13.3 Wave soldering 13.4 Manual soldering 13.5 Package related soldering information 14. Revision history 15. Legal information 15.1 Data sheet status 15.2 Definitions 15.3 Disclaimers 15.4 Trademarks 16. Contact information 17. Contents
