Board-dat/SDR/SDR1109-dat/SDR1109-dat.md
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@@ -10,6 +10,22 @@ https://toshiba.semicon-storage.com/ap-en/semiconductor/product/motor-driver-ics
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![](2024-01-13-11-14-53.png)
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+
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+## VREF
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+
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+- on board RS == 0.15R
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+
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+- I_LIMIT ≈ VREF / (3 × RS)
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+
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+- if Vref = 5V, I_LIMIT = 5 / (3 * 0.15) = 11.11A (theoretically), but max current capability of this chip is 3.5A
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+
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+- if Vref = 1.5V, I_LIMIT = 1.5 / (3 * 0.15) = 3.33A (preferable setup )
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+
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+
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## ref
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-- [[SDR1109]]
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+- [[motor-driver-dat]]
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+
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+- [[SDR1109]]
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+
Chip-dat/toshiba-dat/TB67H450-dat/TB67H450-dat.md
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@@ -25,3 +25,22 @@ voltage 50 V, maximum current 3.5A.
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## application
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![](2025-06-17-13-57-36.png)
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+
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+
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+## Vref
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+- With VREF left **open** / **no voltage applied** → the TB67H450 cannot supply current (limit = 0).
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+- If the constant current control function is **disabled**, the RS pin should be connected to **GND**, and the voltage (1 to 5V) is input to VREF pin.
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+## pins are TTL/CMOS compatible
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+IN1 and IN2 are TTL/CMOS compatible.
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+A 3.3 V logic HIGH is safely above the 2.0 V threshold → so 3.3 V works fine.
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+A 5 V logic HIGH is also allowed (since VIN max is 6 V) → so 5 V is also fine.
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+
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+## ref
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+
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+- [[toshiba-dat]]
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