SN6505B

@@ -0,0 +1,50 @@+# SN6505B++**Texas Instruments** · Transformer driver · SOT-23-6++Drives the primary of a small center-tapped transformer in push-pull to build an isolated DC-DC supply, the power half of an isolated interface next to a digital isolator. Two integrated switches (D1, D2) alternate at a fixed frequency set on-chip, delivering up to 1 A, and slew-rate control plus spread-spectrum clocking keep EMI low. An EN pin gates it and a CLK pin can synchronize several units. It turns a 5 V rail plus a transformer into an isolated output cleanly.++## Pinout++| Pin | Name | Type | Function |+|---|---|---|---|+| 1 | D1 | output | Open-drain output of the first power MOSFET (1 A, R_ON 0.25 Ω max at 4.5 V). Connects to one outer terminal of the center-tapped transformer primary. Traces should be kept short due to large switching currents. |+| 2 | VCC | power_in | Device supply pin, 2.25 V to 5.5 V. Bypass with a 4.7 µF or greater low-ESR capacitor. Internal UVLO (positive-going 2.25 V, negative-going 1.7 V) turns both outputs off when VCC ≤ 2.25 V. |+| 3 | D2 | output | Open-drain output of the second power MOSFET (1 A, R_ON 0.25 Ω max at 4.5 V). Connects to the other outer terminal of the center-tapped transformer primary. Traces should be kept short due to large switching currents. |+| 4 | GND | power_in | Ground reference; connected to the source of the power MOSFET switches via an internal sense circuit. Must be tied to a low-inductance quality ground plane because large switching currents flow through it. |+| 5 | EN | input | Enable input. Logic high (≥0.7·VCC) enables the device; grounding or leaving floating disables all internal circuitry (I_DIS ≈ 0.1 µA). Tie directly to VCC if unused. Absolute max −0.5 V to VCC + 0.5 V. |+| 6 | CLK | input | External clock input for synchronizing switching (100 kHz to 1600 kHz on SN6505B). Internally pulled down to GND; if no valid clock is detected the device automatically switches to its internal 420 kHz oscillator. Absolute max −0.5 V to VCC + 0.5 V. |++## Key specifications++| Parameter | Value |+|---|---|+| Type | Push-pull transformer driver |+| Switch current | 1 A |+| Switching | Fixed frequency (on-chip), spread-spectrum |+| EMI control | Slew-rate limited outputs |+| Enable | EN pin |+| Sync | CLK pin |+| Supply | 2.25-5 V |+| Package | SOT-23-6 |++## Ordering variants++- `SN6505BDBVR (SOT-23-6, 420 kHz)`+- `SN6505ADBVR (160 kHz)`++## CAD (KiCad official)++- Symbol: `Power_Management:SN6505BDBV (KiCad official)`+- Footprint: `Package_TO_SOT_SMD:SOT-23-6`+- 3D model: SOT-23-6 (KiCad packages3D, STEP)++## Provenance++Data extracted from the manufacturer datasheet, not a distributor listing:++- **Datasheet:** [Texas Instruments datasheet](https://www.ti.com/lit/ds/symlink/sn6505b.pdf) (43 pp, sha256 `dfc57cb042218cb6`, retrieved 2026-08-17, tier: manufacturer)+- **Extractor:** `ds2sf` (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.+- **CAD:** KiCad official libraries (CC-BY-SA 4.0).++[Datasheet PDF](docs/sn6505b-datasheet.pdf)

@@ -0,0 +1,38 @@+{+  "slug": "sn6505b",+  "version": "0.1.0",+  "type": "component",+  "description": "TI low-noise push-pull transformer driver, SOT-23-6. For small isolated DC-DC supplies, up to 1 A switches. Datasheet-verified.",+  "tags": [+    "component",+    "power",+    "transformer-driver",+    "isolated-supply",+    "push-pull",+    "sot-23-6",+    "texas-instruments"+  ],+  "dependencies": {},+  "hero": {+    "type": "image",+    "path": "docs/hero.png"+  },+  "files": [+    "page.json",+    "README.md",+    "sn6505b.kicad_sym",+    "sn6505b.kicad_mod",+    "sn6505b.glb",+    "sn6505b.step",+    "sn6505b.lbr",+    "docs/hero.png",+    "docs/sn6505b-datasheet.pdf",+    "viewers/symbol.html",+    "viewers/footprint.html"+  ],+  "visibility": "public",+  "author": {+    "name": "Ray",+    "email": "[email protected]"+  }+}\ No newline at end of file