QuickView - MAX15000, MAX15001 Current-Mode PWM Controllers with Programmable Switching Frequency

Description

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The MAX15000/MAX15001 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX15000 is well suited for universal input (rectified 85VAC to 265VAC) or telecom (-36VDC to -72VDC) power supplies. The MAX15001 is well suited for low input voltage (9.5VDC to 24VDC) power supplies.

The MAX15000/MAX15001 contain an internal error amplifier that regulates the tertiary winding output voltage which is used in primary-side regulated isolated power supplies. Primary-side regulation eliminates 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. An open-drain UVLO flag output, with 210µs internal delay, allows the sequencing of a secondary-side controller. The input-supply start voltage is externally programmable with a voltage divider. A UVLO/EN input is used to shutdown the MAX15000/MAX15001. Internal digital soft-start eliminates output voltage overshoot.

The MAX15000 has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for startup. The MAX15001 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 9.5V.

The switching frequency for the MAX15000/MAX15001 is programmable with an external resistor. The MAX15000A/MAX15001A provide a 50% maximum duty-cycle limit, while the MAX15000B/MAX15001B provide a 75% maximum duty-cycle limit. These devices are available in 10-pin µMAX® packages and are rated for operation over the -40°C to +85°C temperature range.

An evaluation kit is available: MAX15000AEVKIT

Key Features

Applications/Uses

Current-Mode Control
Programmable Switching Frequency Up to 625kHz
Accurate UVLO Threshold (1%)
Open-Drain UVLO Flag Output with Internal Delay
36V to 72V Telecom Voltage Range
Universal Offline Input Voltage Range
- Rectified 85VAC to 265VAC (MAX15000)
9.5V to 24V Input (MAX15001)
Digital Soft-Start
Internal Bootstrap UVLO With Large Hysteresis (MAX15000)
Internal Error Amplifier with 1.5% Accurate Reference
50µA (typ) Startup Supply Current
50% Maximum Duty-Cycle Limit (MAX15000A/MAX15001A)
75% Maximum Duty-Cycle Limit (MAX15000B/MAX15001B)
60ns Cycle-by-Cycle Current-Limit Propagation Delay
Available in Tiny 10-Pin µMAX Packages

	1/2, 1/4, and 1/8th Brick Power Modules
	12V Boost and SEPIC Regulators
	High-Efficiency, Isolated Telecom Power Supplies
	Industrial Power Conversion
	Isolated and Nonisolated High-Brightness LED Power Supplies
	Isolated Keep-Alive Power Supplies
	Networking/Server

Key Specifications: Isolated Power Supplies

Part Number

V_IN
(V)

Topology

Features

Cntrl. Loop

Feedback

Freq.
(kHz)

Duty Cycle
(%)

I_STARTUP
(mA)

I_CC
(mA)

Gate Drive Current
(A)

Oper. Temp.
(°C)

Price

min

max

min

max

See Notes

MAX15000

Flyback

Single-Ended Forward

Adjustable Frequency

High Voltage Start-Up Circuit

Internal Error Amplifier

Thermal Shutdown

UVLO

Current Mode

Primary Side

625

0.09

-40 to +85

$0.93 @1k

MAX15001

9.5

$0.93 @1k

See All Isolated Power Supplies (31)

Diagram

Typical Operating Circuit

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Document Ref.: 19-3957; Rev 0; 2006-02-14
This page last modified: 2007-08-07