ZHCSPT6D July 2023 – June 2024 TPSM8287A06 , TPSM8287A10 , TPSM8287A12 , TPSM8287A15
PRODUCTION DATA
Table 9-4 lists the operating parameters for this application example with four TPSM8287A12BAS devices working in parallel to increase the output current.
SYMBOL | PARAMETER | VALUE |
---|---|---|
VIN | Input voltage | 2.7 – 6.0 V |
VOUT | Output voltage | 0.60 V |
TOLVOUT | Output voltage tolerance allowed by the application | ±3.3 % |
TOLDC | Output voltage tolerance of the TPSM8287A12BAS (DC accuracy) | ±0.8 % |
ΔIOUT(step) | Output current load step | ±30.0 A |
tt | Load step transition time | 1 μs |
fSW | Switching frequency | 1.5 MHz |
L | Integrated inductor | 100 nH |
TOLIND | Integrated inductor tolerance | ±20 % |
gm | Error amplifier transconductance | 1.5 mS |
τ | Emulated current time constant | 12.5 μs |
TOLτ | Tolerance of the emulated current time constant | ±30 % |
BWτ | Target loop bandwidth | 375 kHz |
NΦ | Number of paralleled devices (phases) | 4 |
The maximum allowable deviation of the power supply is ±3.3%. The DC accuracy of the TPSM8287Axx is specified as ±0.8%, and therefore the maximum output voltage variation during a transient is given by:
Equation 36 computes the peak-to-peak inductor current ripple, which is the greatest at the maximum input voltage:
The maximum load step occurs when the load step from the application occurs at exactly the same time as the peak (or trough) of the inductor ripple current, and is given by: