STK672-400C-E 데이터 시트보기 (PDF) - SANYO -> Panasonic

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STK672-400C-E

Thick-Film Hybrid IC 2-phase Stepping Motor Driver

SANYO -> Panasonic 

STK672-400C-E

3. Calculating STK672-400C-E HIC Internal Power Loss

HIC internal loss calculation of STK672-400C-E

The internal average power loss in the excitation modes of STK672-400 is calculated as follows:

[Excitation modes]

2 phase excitation mode

2PdAV = (Vsat+Vdf)×0.5×CLOCK×IOH×t2+0.5×CLOCK×IOH× (Vsat×t1+Vdf×t3) --------------------------- (3-1)

1-2 phase excitation mode

1-2PdAV = (Vsat+Vdf)×0.25×CLOCK×IOH×t2+0.25×CLOCK×IOH× (Vsat×t1+Vdf×t3) ---------------------- (3-2)

W1-2 phase excitation mode

W1-2PdAV =0.64[(Vsat+Vdf)×0.25×CLOCK×IOH×t2+0.25×CLOCK×IOH× (Vsat×t1+Vdf×t3)] ------------- (3-3)

2W1-2 phase excitation mode

2W1-2PdAV =0.64[(Vsat+Vdf)×0.0625×CLOCK×IOH×t2+0.0625×CLOCK×IOH× (Vsat×t1+Vdf×t3)] ------ (3-4)

4W1-2 phase excitation mode

4W1-2PdAV =0.64[(Vsat+Vdf)×0.0625×CLOCK×IOH×t2+0.0625×CLOCK×IOH× (Vsat×t1+Vdf×t3)] ------ (3-5)

At motor hold

Hold PdAV = (Vsat+Vdf)×IOH---------------------------------------------------------------------------------------------- (3-6)

Note: 2-phase 100% conductance is assumed in Equation (3-6).

Vsat: Synthetic voltage of Ron voltage drop + Synthetic voltage of current detection resistance

Vdf: Synthetic voltage of FET body diode Vdf + Synthetic voltage of current detection resistance

CLOCK: Input clock CLK (reference frequency before splitting into four phases)

t1, t2, and t3 are waveforms shown in the following figure:

t1: Time till the winding current reaches the set value (IOH).

t2: Time for the constant-current control (PWM) region

t3: Time from the phase signal OFF up to regenerative consumption of the counter electromotive force

IOH

0A

t1

t2

t3

Motor COM Current Waveform Model

t1= (-L/(R+0.42)) ln (1-((R+0.42)/VCC1) ×IOH)) ---------------------------------------------------------------- (3-7)

t3= (-L/R) ln ((VCC1+0.9)/(IOH×R+VCC1+0.9)) ---------------------------------------------------------------- (3-8)

VCC1: Motor supply voltage (V)

L: Motor inductance (H)

R: Motor winding resistance (Ω)

IOH: Motor set output current crest value (A)

No.A2136-12/19

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