Key Selection Information
| Selection Parameter | Confirmed Information |
|---|---|
| Topology | Push-pull / bridge current-mode PWM controller |
| Startup Input | 14 V to 100 V internal high-voltage startup regulator range |
| Outputs | Two alternating gate-driver outputs |
| Peak Gate Drive | 1.5 A stated |
| Oscillator | Single-resistor setting; up to 1 MHz; synchronizable |
| Protection | Dual-mode overcurrent, slope compensation, thermal shutdown |
| Control | Soft start, error amplifier, precision reference, optocoupler interface |
| Exact Package / Packing | VSSOP (DGS), 10 pins; 3500-piece large reel; −40°C to +125°C; marking S73B |
Product Overview
LM5030MMX/NOPB is a high-voltage current-mode controller for push-pull and bridge-derived isolated converters. Its internal startup regulator can operate directly from telecom/industrial rails up to 100 V, reducing the auxiliary startup circuitry needed around the PWM IC.
Two alternating gate outputs provide the timing basis for transformer push-pull operation. Current-mode control, slope compensation and dual-mode overcurrent protection shape the primary-side current loop rather than simply generating complementary clocks.
The MMX/NOPB order code is the 3500-piece VSSOP reel. The small package saves board space but puts current-sense, gate-drive and feedback routing close together, so layout discipline remains critical.
For related devices, see HKEQGOO’s AC-DC Controllers category.
Technical Specifications
| Parameter | Verified Information |
|---|---|
| Manufacturer | Texas Instruments |
| Exact MPN | LM5030MMX/NOPB |
| Topology | Push-pull / bridge current-mode PWM controller |
| Startup Input | 14 V to 100 V internal high-voltage startup regulator range |
| Outputs | Two alternating gate-driver outputs |
| Peak Gate Drive | 1.5 A stated |
| Oscillator | Single-resistor setting; up to 1 MHz; synchronizable |
| Protection | Dual-mode overcurrent, slope compensation, thermal shutdown |
| Control | Soft start, error amplifier, precision reference, optocoupler interface |
| Exact Package / Packing | VSSOP (DGS), 10 pins; 3500-piece large reel; −40°C to +125°C; marking S73B |
| Manufacturer Status | Active / Production |
| Part Marking | S73B |
Functional Highlights
100-V startup eases high-rail bias generation
The controller can start from common 48-V telecom rails without a separate low-voltage preregulator dedicated only to controller startup.
Alternating outputs are topology-specific
This device is intended for push-pull/bridge power stages; it is not a single-switch flyback controller like UCC28740.
Design Considerations
- Design transformer volt-second balance and current-sense filtering for push-pull operation.
- Keep CS and COMP nodes away from gate-drive currents.
- Check startup-regulator dissipation at the highest VIN until the auxiliary bias supply takes over.
Product Status and Exact Order Code
Texas Instruments/source evidence identifies LM5030MMX/NOPB as Active / Production; VSSOP (DGS), 10 pins; 3500-piece large tape and reel; −40°C to +125°C; marking S73B.
Related Engineering Resources
Quality & Verification Support
Third-party inspection or testing can be arranged according to customer requirements. Testing fees are borne by the buyer. Additional verification requirements can be discussed before shipment. After an order is placed, physical product, label, packaging, and Date Code photos may be provided where appropriate.
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