2 × 260 W @ 4 Ω (1 % THD+N) BTL / 600 W PBTL class-D EVM (TPA3255)
← All reference designs · Vendor page: TI TPA3255EVM
| Hardware | orderable |
|---|---|
| Status | active |
| Application | audio |
| Semiconductors | Si |
| Key devices | TPA3255, NE5532 |
| Deliverables | schematic, bom, layout, design-guide |
| Channels | 2 |
| Output config | btl |
| Power / ch (W) | 260 (vendor-claimed) |
| Load (Ω) | 4 |
| Power rated at THD+N (%) | 1 |
| Other ratings | power_W: 315; load_ohm: 4; thd_pct: 10; config: btl, power_W: 150; load_ohm: 8; thd_pct: 1; config: btl, power_W: 185; load_ohm: 8; thd_pct: 10; config: btl, power_W: 480; load_ohm: 2; thd_pct: 1; config: pbtl, power_W: 600; load_ohm: 2; thd_pct: 10; config: pbtl |
| THD+N (%) | 0.006 (vendor-claimed) |
| THD+N conditions | 1 W, 1 kHz, 4 Ω |
| PSRR (dB) | 65 (vendor-claimed) |
| Efficiency, full power (%) | 90 |
| Supply | 18–53.5 V |
| Modulation | ad |
| Feedback | pre-filter |
| Input | analog-diff, analog-se |
| Spread spectrum | no |
| Last verified | 2026-10-21 |
Notes
Why it is interesting: the datasheet gives power at both 1 % and 10 % THD+N, so it calibrates the “10 % vs 1 %” inflation: 315/260 = 1.21 at 4 Ω and 185/150 = 1.23 at 8 Ω. The primary rating here is the 1 % figure for like-for-like comparison; the 10 % figures are in alt_ratings.
Check: 260 W into 4 Ω → V_pk = √(2·260·4) = 45.6 V across the BTL load from a ≤ 53.5 V rail. Expect ~2–3 V of drop in
the FETs and filter at ~11 A peak.
The feedback: pre-filter entry reflects the integrated feedback taken at the IC outputs; verify against the
datasheet block diagram. PSRR is > 65 dB (BTL, 1 kHz, no input).
Tags: closed-loop-integrated · 2.0-2.1-4.0-configurable · datasheet-power-at-1-and-10-pct