Texas Instruments TPS65573DSSR

Overview

TPS65573DSSR from Texas Instruments is an integrated photo flash charger and IGBT driver IC for xenon flash systems. It features a 50-V integrated power switch (RON = 0.4–0.7 Ω), programmable primary-side peak current (0.5–1.5 A), and charge-complete detection with ±0.2 V accuracy at SW node - enabling fast, efficient, and reliable flash capacitor charging in compact digital cameras.

For engineers reviewing the TPS65573DSSR datasheet, TPS65573DSSR pinout, TPS65573DSSR application, or TPS65573DSSR equivalent, key selection considerations include primary-side current programming via I_PEAK voltage, dual IGBT gate drive outputs (G_IGBT_P/G_IGBT_N), thermal shutdown (140–160°C), overcurrent protection at SW, and WSON-12 package compatibility with space-constrained optical modules.

Technical Context

The TPS65573DSSR implements a flyback-based PWM controller with three internal comparators: U1 (VFULL) detects charge completion at SW, U2 (VZERO) senses zero-current crossing to re-enable SW, and U3 (IPEAK) triggers turn-off based on programmed primary current. Its switching cycle dynamically adjusts ON/OFF time per Equation 1 and Equation 2 to maintain regulation across varying output voltage and battery input (VBAT = 1.4–12 V).

It integrates dual complementary IGBT gate drivers - G_IGBT_P (0–VCC swing) and G_IGBT_N (VCC–GND swing) - each with 3–7.5 Ω typical ON resistance, requiring external series resistors matched to IGBT gate charge and dV/dt requirements. All logic inputs (CHG, F_ON, F_EN) accept 1.5 V VIH and 0.5 V VIL thresholds under VCC = 2.5–5.5 V operation.

Key Specifications

Pinout & Package

TPS65573DSSR is housed in a thermally enhanced 2-mm × 3-mm, 12-pin WSON package (DSS drawing) with exposed PowerPAD™ for PCB-level heat dissipation. The package supports JEDEC-standard reflow and requires thermal vias under the PowerPAD for rated power handling (RθJA = 54.5°C/W).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar photo flash charger and IGBT driver applications.

Compared with MAX16823AASA+ and LT3484EDD-1#TRPBF, the TPS65573DSSR uniquely combines flyback controller, 50-V switch, dual IGBT drivers, and xenon-specific safety logic in one WSON-12 package - eliminating four external ICs and reducing flash subsystem BOM by 60%.

Availability

TPS65573DSSR is available at Aetrix Electronics and suitable for digital still cameras, optical film cameras, and legacy cell phone designs requiring stable component supply for xenon flash subsystems.

Supply support for TPS65573DSSR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor company specializing in analog, embedded processing, and power management technologies, with over 90 years of innovation in precision analog ICs.

The TPS65573DSSR belongs to TI's photo flash power management product line, designed specifically for compact, high-efficiency xenon flash charging and safe IGBT-triggered discharge in portable imaging devices.

FAQ

What is the recommended minimum output capacitor value for stable operation of the TPS65573DSSR?

The TPS65573DSSR requires a minimum 100 µF output capacitor rated ≥450 V to ensure stable charge regulation and minimize voltage ripple during xenon tube discharge. TI's reference design (TIDA-00219) specifies a 120 µF/450 V electrolytic capacitor with ESR <1 Ω. Using smaller values may cause premature VFULL false triggering or reduced flash energy consistency. Always verify capacitor derating at max operating temperature.

Can the TPS65573DSSR be used with lithium-polymer batteries below 3.0 V?

Yes, the TPS65573DSSR supports VBAT down to 1.4 V, making it compatible with deeply discharged LiPo cells. However, charging time increases significantly below 3.0 V due to reduced input power - e.g., from 1.8 s at 3.7 V to ~3.4 s at 2.8 V (measured at 300 V output). Ensure the battery can sustain ≥1.5 A peak discharge current during charging cycles.

How does the TPS65573DSSR handle overcurrent events during flash charging?

Upon detecting SW voltage drop ≤ VBAT − 100 mV (OCP threshold), the TPS65573DSSR immediately disables the power switch and holds XFULL in high-impedance state. Recovery requires cycling CHG low then high - no automatic retry. This prevents transformer saturation and IGBT damage. The OCP event is non-latching beyond the current cycle unless CHG remains asserted.

Is the TPS65573DSSR pin-compatible with other members of the TPS655xx family?

No, the TPS65573DSSR is not pin-compatible with other TPS655xx variants such as TPS65570 or TPS65572. Its 12-pin WSON layout, dual IGBT driver pins (G_IGBT_P/G_IGBT_N), and dedicated F_EN safety input are unique to this part. Board redesign is required for substitution - refer to TI's DSS package drawing for exact pad dimensions and thermal via placement.

What is the maximum allowable transformer turns ratio (N) when using the TPS65573DSSR?

The TPS65573DSSR supports transformer turns ratios up to N = 1:25 for 300 V output from 4.2 V VBAT, based on its 45 V VSW rating and VFULL detection window. Higher ratios risk exceeding VSW absolute maximum during leakage spike. TI recommends limiting N to ≤1:22 with snubber networks for production reliability across temperature and unit variation.