SLVAFE7 September   2022 LM51551

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Design Specification and Key Challenges
  4. 2High-Voltage Power Supply Design Using SEPIC
    1. 2.1 TI HV Supply Architecture Using SEPIC Topology
    2. 2.2 Switching Frequency Shift
    3. 2.3 Voltage Control by External Signal
  5. 3Test Result
    1. 3.1 Efficiency and Power Consumption (100 kHz vs 250 kHz)
    2. 3.2 Linearity of Output Voltages vs VBIAS
    3. 3.3 Output Ripple Measurement
    4. 3.4 Load Transient Test
    5. 3.5 Overload Protection
    6. 3.6 Thermal Image
  6. 4Summary
  7. 5References

3.3 Output Ripple Measurement

Figure 3-5 through Figure 3-8 show the output voltage ripple at 15-V and 7-V output voltage during no load and full load.

GUID-20220808-SS0I-FVMF-NQXW-LL6XBKNJPF2X-low.png
CH1: VOUT1, CH2: VOUT2, CH3: IOUT1, CH4: IOUT2
Figure 3-5 12-V Input, ±15-V No Load
GUID-20220808-SS0I-V8DN-GDLC-L6M2FVWPCRC7-low.png
CH1: VOUT1, CH2: VOUT2, CH3: IOUT1, CH4: IOUT2
Figure 3-7 12-V Input, ±75-V No Load
GUID-20220808-SS0I-PDQV-ZJVC-J9QH3PRNH84C-low.png
CH1: VOUT1, CH2: VOUT2, CH3: IOUT1, CH4: IOUT2
Figure 3-6 12-V Input, ±15 V, 10-mA Load
GUID-20220808-SS0I-8GFN-LKDS-DXM5VXFSKTMV-low.png
CH1: VOUT1, CH2: VOUT2, CH3: IOUT1, CH4: IOUT2
Figure 3-8 12-V Input, ±75 V, 10-mA Load