LM5041B Texas instruments

The LM5041B PWM controller contains all of the features necessary to implement either current-fed or voltage-fed push-pull or bridge power converters. These “Cascaded” topologies are well suited for multiple output and higher power applications. The LM5041B includes these four control outputs: the buck stage controls (HD and LD) and the push-pull control outputs (PUSH and PULL). Push-pull outputs are driven at 50% nominal duty cycle at one half of the switching frequency of the buck stage and can be configured for either a guaranteed overlap time (for current-fed applications) or a guaranteed non-overlap time (for voltage-fed applications). Push-pull stage MOSFETs can be driven directly from the internal gate drivers while the buck stage requires an external driver such as the LM5102. The LM5041B includes a high-voltage start-up regulator that operates over a wide input range of 15V to 100V. The PWM controller is designed for high-speed capability including an oscillator frequency range up to 1 MHz and total propagation delays of less than 100 ns. Additional features include line Under-Voltage Lock-Out (UVLO), Soft-Start, an error amplifier, precision voltage reference, and thermal shutdown. The differences between LM5041, LM5041A and LM5041B are as follows: In the LM5041A and the LM5041B version, the hiccup mode over-current protection is not employed and the VCC bias regulator is not disabled by a low state at the SS pin. In the LM5041B version, both the high and low side buck stage gate drivers are forced to a low state when the controller is disabled. In the LM5041 and the LM5041B version, the buck stage controller is disabled by either a low state at the UVLO pin or a low state at the SS pin. Also in the LM5041B version, the REF pin 5V regulator is not disabled by a UVLO pin low state.

Internal Start-up Bias Regulator

Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis

Current Mode Control

Internal Error Amplifier with Reference

Cycle-by-cycle Over-Current Protection

Leading Edge Blanking

Programmable Push-Pull Overlap or Dead Time

Internal 1.5A Push-Pull Gate Drivers

Programmable Soft-Start

Programmable Oscillator with Sync Capability

Precision Reference

Thermal Shutdown

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Topology	Push pull
Control mode	Current
Duty cycle (max) (%)	50
Switching frequency (max) (kHz)	1000
Features	Current limiting, Programmable soft start, Synchronization pin
UVLO thresholds on/off (V)	Programmable/2.5V
Operating temperature range (°C)	-40 to 125
Rating	Catalog
Gate drive (typ) (A)	1.5
Vin (max) (V)	15