TIDT272 April   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Voltage and Current Requirements
    2. 1.2 Considerations
    3. 1.3 Dimensions
  5. 2Testing and Results
    1. 2.1 Efficiency Graphs
    2. 2.2 Efficiency Data
    3. 2.3 Load Regulation
      1. 2.3.1 Primary Output
      2. 2.3.2 Secondary Outputs
        1. 2.3.2.1 Positive Outputs
        2. 2.3.2.2 Negative Outputs
    4. 2.4 Line Regulation
      1. 2.4.1 Primary Output
      2. 2.4.2 Secondary Outputs
        1. 2.4.2.1 Positive Outputs
        2. 2.4.2.2 Negative Outputs
    5. 2.5 Thermal Images
    6. 2.6 Bode Plots
      1. 2.6.1 5.5-V Input Voltage
      2. 2.6.2 12-V Input Voltage
  6. 3Waveforms
    1. 3.1 Switching
      1. 3.1.1 Q1 Drain to GND
      2. 3.1.2 Q1 Gate to GND
      3. 3.1.3 Diode D12
      4. 3.1.4 Diode D9
    2. 3.2 Output Voltage Ripple
      1. 3.2.1 Primary 10 V (Auxiliary)
      2. 3.2.2 Secondary +15 V
      3. 3.2.3 Secondary –5 V
    3. 3.3 Input Voltage Ripple
    4. 3.4 Start-Up Sequence
    5. 3.5 Shutdown Sequence

2.2 Efficiency Data

Efficiency data for special cases (cross regulation) is shown in the following table.

Table 2-1 Efficiency Data for Special Cases (Cross Regulation)
Case A Case B

VIN

12.004

12.018

IIN

0.5626

0.456

VOP

10.122

10.1224

IOP

0.2007

0.2007

UOs1+

15.14

15.16

IOs1+

0.0751

0.0752

UOs1–

4.841

4.847

IOs1–

0.0733

0.0732

UOs2+

15.14

15.75

IOs2+

0.0756

0.008

UOs2–

4.86

5.06

IOs2–

0.0726

0.0076

UOs3+

15.74

15.76

IOs3+

0.0152

0.0152

UOs3–

5.061

5.065

IOs3–

0.0146

0.0147

PIN = UIN × IIN

6.753

5.480

Pop =VOP × IOP

2.031

2.032

POs1+ = (UOS1+) × (IOS1+)

1.137

1.140

POs1– = (UOS1–) × ( IOS1–)

0.355

0.355

POs2+= (UOS2+) × (IOS2+)

1.145

0.126

POs2– = (UOS2–) × (IOS2–)

0.353

0.038

POs3+ = (UOS3+) × (IOS3+)

0.239

0.240

POs3– = (UOS2–) × (IOS2-)

0.074

0.074

PO= POP + (POS1+) + (POS1–) + (POS2+) + (POS2–) + (POS3+) + (POS3–)

5.334

4.005

Eff = PO / PIN

0.790

0.731

Loss = PIN – PO

1.420

1.475

Case A ⇒ Primary, Secondary 1 and 2 ⇒ full load; Secondary 3 ⇒ 10%

Case B ⇒ Primary, Secondary 1 ⇒ full load; Secondary 2 and 3 ⇒ 10%

Positive voltage 15 V varies in between 15.14 V to 15.76 V

Negative voltage –5 V varies in between –4.86 V to –5.07 V