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Isolated Power 
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MAX5052A, MAX5052B
Current-Mode PWM Controllers with an Error Amplifier for Isolated/Nonisolated Power Supplies
Isolated/Nonisolated Current-Mode PWM Controllers Work with Universal Offline, Telecom, or 12V Input Voltage
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Key Features
Applications/Uses
Parametric specs for Isolated Power Supplies
| VIN (V) (min) | 21.6 |
| VIN (V) (max) | 1000 |
| Topology | Flyback Single-Ended Forward |
| Application (VIN) | Networking (48V) Power Over Ethernet (32-58V) Telecom (36-72V) Universal Off-line (90-240VAC) |
| Control Loop | Current Mode |
| Feedback | Linear Opto |
| Switching Frequency (kHz) | 262 |
| Duty Cycle (%) (max) | 50 75 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 0.93 |
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Parameters
Parametric specs for Isolated Power Supplies
| VIN (V) (min) | 21.6 |
| VIN (V) (max) | 1000 |
| Topology | Flyback Single-Ended Forward |
| Application (VIN) | Networking (48V) Power Over Ethernet (32-58V) Telecom (36-72V) Universal Off-line (90-240VAC) |
| Control Loop | Current Mode |
| Feedback | Linear Opto |
| Switching Frequency (kHz) | 262 |
| Duty Cycle (%) (max) | 50 75 |
| Oper. Temp. (°C) | -40 to +85 |
| Package/Pins | UMAX/8 |
| Budgetary Price (See Notes) | 0.93 |
Key Features
- Available in a Tiny 8-Pin µMAX Package
- Current-Mode Control
- 50W Output Power
- Universal Offline Input Voltage Range
- Rectified 85VAC to 265VAC (MAX5052)
- VIN Directly Driven from 10.8V to 24V Input (MAX5053)
- Digital Soft-Start
- Programmable Input Startup Voltage
- Internal Bootstrap UVLO with Large Hysteresis (MAX5052)
- Internal Error Amplifier with 1% Accurate Reference
- Thermal Shutdown
- 45µA (typ) Startup Supply Current
- 1.4mA (typ) Operating Supply Current
- Fixed Switching Frequency of 262kHz ±12%
- 50% Maximum Duty-Cycle Limit (MAX5052A/MAX5053A)
- 75% Maximum Duty-Cycle Limit (MAX5052B/MAX5053B)
- 60ns Cycle-by-Cycle Current-Limit Response Time
Applications/Uses
- 12V Boost Regulators
- 12V SEPIC Regulators
- Computer Systems/Servers
- Industrial Power Conversion
- Isolated Keep-Alive Circuits
- Isolated Telecom Power Supplies
- Networking Systems
- Power Supplies
- Universal Input AC
Description
The MAX5052/MAX5053 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX5052 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX5053 is well suited for low-input-voltage (10.8VDC to 24VDC) power supplies.
The MAX5052/MAX5053 contain an internal error amplifier that regulates the tertiary winding output voltage. This implements a primary-side regulated, isolated power supply, eliminating the need for an optocoupler. An input undervoltage lockout (UVLO) is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. The input-supply start voltage is externally programmable with a voltage-divider. To shutdown the device, the UVLO pin is pulled low. Internal digital soft-start reduces output voltage overshoot. The internal thermal shutdown circuit protects the device in the event the junction temperature exceeds +130°C.
The MAX5052 has an internal bootstrap UVLO with large hysteresis that requires a minimum voltage of 23.6V for startup. The MAX5053 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 10.8V.
The 262kHz switching frequency is internally trimmed to ±12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5052A/MAX5053A are offered with a 50% maximum duty-cycle limit. The MAX5052B/MAX5053B are offered with a 75% maximum duty-cycle limit. These devices are available in 8-pin µMAX packages and operate over the -40°C to +85°C temperature range.
The MAX5052/MAX5053 contain an internal error amplifier that regulates the tertiary winding output voltage. This implements a primary-side regulated, isolated power supply, eliminating the need for an optocoupler. An input undervoltage lockout (UVLO) is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. The input-supply start voltage is externally programmable with a voltage-divider. To shutdown the device, the UVLO pin is pulled low. Internal digital soft-start reduces output voltage overshoot. The internal thermal shutdown circuit protects the device in the event the junction temperature exceeds +130°C.
The MAX5052 has an internal bootstrap UVLO with large hysteresis that requires a minimum voltage of 23.6V for startup. The MAX5053 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 10.8V.
The 262kHz switching frequency is internally trimmed to ±12% accuracy; this allows the optimization of the magnetic and filter components resulting in compact, cost-effective power supplies. The MAX5052A/MAX5053A are offered with a 50% maximum duty-cycle limit. The MAX5052B/MAX5053B are offered with a 75% maximum duty-cycle limit. These devices are available in 8-pin µMAX packages and operate over the -40°C to +85°C temperature range.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .
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