TIDT253 January   2022

 

  1.   Description
  2.   Features
  3.   Applications
  4. 1Test Prerequisites
    1. 1.1 Key System Requirements
  5. 2Testing and Results
    1. 2.1 Sensed VCR and Output Voltage Ripple Under Different Loads
    2. 2.2 Control Loop Bode Plot Comparison
    3. 2.3 Transient Response Test
    4. 2.4 References

2.3 Transient Response Test

The following tables present load transient comparisons between HHC and VMC:

Table 2-1 VOUT Deviation Comparison Between HHC and VMC
Load Transient Parameters HHC VMC Output
Capacitance:
3300 μF × 2
25% → 85% Load Transient (4 A/μs)
Transition: 10 μs 		GUID-20211208-SS0I-W6NH-DQ3L-ZVT75NXDW3RF-low.png GUID-20211208-SS0I-PVDC-JXWD-ZD4FWKHVS7WB-low.png HHC: 390 mV
vs
VMC: 450 mV
85% → 25% Load Transient (4 A/μs)
Transition: 10 μs		 GUID-20211208-SS0I-N2G2-CHMQ-8N6MG5XJ1VH9-low.png GUID-20211208-SS0I-K9DW-SWJX-45XKNJXGXM1H-low.png HHC: 480 mV
vs
VMC: 500 mV
1 A → 70 A Load Transient (1 A/μs)
Transition: 60 μs		 GUID-20211208-SS0I-JX1L-1JJF-JTHZPTHTHZS6-low.png GUID-20211208-SS0I-WPHC-6ZK3-GS8PQ3BPCMNR-low.png HHC: 430 mV
vs
VMC: 530 mV
70 A → 1 A Load Transient (1 A/μs)
Transition: 60 μs		 GUID-20211208-SS0I-1G32-9PH6-DZSVTGM0ZPFC-low.png GUID-20211208-SS0I-MXWZ-XK6R-NC8M3LCDG59Z-low.png HHC: 300 mV
vs
VMC: 470 mV
Table 2-2 Settling Time Comparison Between HHC and VMC
Load Transient Parameters HHC VMC Output
Capacitance:
3300 μF × 2
25% → 85% Load Transient (4 A/μs)
Transition: 10 μs 		GUID-20211208-SS0I-T7P6-K4ZP-49LLQJKR1GNR-low.png GUID-20211208-SS0I-RZHW-G8TK-LS9SNDW6JNSS-low.png HHC: 76.8 μs
vs
VMC: 538 μs
85% → 25% Load Transient (4 A/μs)
Transition: 10 μs		 GUID-20211208-SS0I-JNNC-ZBPW-8C71J1WZTFWH-low.png GUID-20211208-SS0I-FGS3-4ZMT-XJWXRSQM9KXB-low.png HHC: 88.4 μs
vs
VMC: 404 μs