Removed DCDC enable control

dzid26 · Jan 27, 2025 · 15b1857 · 15b1857
1 parent 65b7e3f
commit 15b1857
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diff --git a/PCB/DCDC_3.3.kicad_sch b/PCB/DCDC_3.3.kicad_sch
@@ -2152,15 +2152,14 @@
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-	(text "Calculate resistors for undervoltage cutout:\nI_{1} = 1uA\nI_{Hyst}=3uA\nV_{Ena} = 1.25V  (1.05...1.38)\n\nAssume typical V_{Ena} = 1.25V:\nR1 = (V_{start} - V_{stop})/I_{Hyst}\nR1 = (10.6V - 7.6V) / 3uA = 1MOhm\nR2 = V_{Ena} / ((V_{start} - V_{Ena})/R1+I_{1})\nR2_{rounded} = 1.25V / ((10.6V-1.25V)/1MOhm + 1uA) ≈ 120kOhm\n\nThere is a shchotky in series so actual threshold is:\nV_{stop_real} = V_{stop_typ}+D1_V{F}_ON\nV_{start_real} = V_{start_typ}+D1_V{F}_OFF\nV_{stop_real} = 7.6 + 0.4 = 8V\nV_{start_real} = 10.6 + 0.3 = 10.9V\n\n\nCap_time_const:\n12V -> 9.5V ~65ms\n0V -> On: ~150ms"
+	(text "Calculate resistors for undervoltage cutout:\nI_{1} = 1uA\nI_{Hyst}=3uA\nV_{Ena} = 1.25V  (1.05...1.38)\n\nAssume typical V_{Ena} = 1.2V:\nR1 = (V_{start} - V_{stop})/I_{Hyst}\nR1 = (7.1V - 6.5) / 3uA = 200kOhm = (more like 100k in real world)\nR2 = V_{Ena} / ((V_{start} - V_{Ena})/R1+I_{1})\nR2_{rounded} = 1.2V / ((7.1V-1.2V)/100kOhm + 1uA) = 20kOhm\n\nThere is a didoe in series\nD1_V{F}_ON = 0.8\nD1_V{F}_OFF = 0.5\nso actual threshold is:\nV_{stop_real} = V_{stop}+D1_V{F}_ON\nV_{start_real} = V_{start}+D1_V{F}_OFF\nV_{stop_real} = 6.5 + 0.8 = 7.3V\nV_{start_real} = 7.1 + 0.4 = 7.5V"
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@@ -2245,7 +2241,6 @@
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@@ -3418,7 +3413,7 @@
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