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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 248kB) Download   E-Mail

Description

The MAX8540/MAX8541 pulse-width-modulated (PWM) controllers for forward/flyback isolated DC-to-DC converters provide maximum flexibility to power-supply designers and reduce external component count. These controllers allow common PC board layout for current-mode (MAX8540) and voltage-mode (MAX8541) designs. Both controllers feature adjustable switching frequency and external synchronization from 200kHz to 1MHz. Active-high and active-low enable, undervoltage protection (UVP), and overvoltage protection (OVP) reduce external component count. Maximum duty cycle is adjustable, and the feed-forward function scales the maximum duty cycle with input voltage to limit the maximum volt-seconds applied to the transformer primary. The MAX8540 allows the user to select the value of slope compensation to further optimize magnetics design. The MAX8541 features user-adjustable ramp magnitude for the PWM comparator. A cycle-by-cycle current-limit function controls the peak primary current during overload and short circuit. Both controllers can be set to latch off or to hiccup when a short circuit is detected. The number of current-limited cycles to initiate the hiccup mode and number of cycles skipped are user selectable to allow startup with high-capacitance loads and protect the converter against sustained short circuits. The MAX8540/MAX8541 feature 9Ω internal gate drivers for low-power applications and are compatible with external gate drivers for high-power applications. Both devices are available in the space-saving 16-pin QSOP package. The MAX8541 EV kit evaluates the MAX8540 and the MAX8541 to speed designs. Design examples are also available in application notes: 50W Voltage-Mode Forward Converter Design with the MAX8541 and 50W Current-Mode Forward Converter Design with the MAX8540.

Key Features		Applications/Uses
200kHz to 1MHz Adjustable Switching Frequency Synchronization to External Clock Programmable, Constant Maximum Volt-Second Simplifies Transformer Design Programmable Hiccup/Skip Cycles or Latch-Mode Protection Clean Startups with High-Capacitance Loads Programmable Under/Overvoltage Protection Current-Mode, Adjustable Slope Compensation (MAX8540) Voltage-Mode, Adjustable Ramp Magnitude (MAX8541) 10mA, 5V Regulator 75mV to 1.25mV Adjustable Current Limit Reduces External Components Internal Gate Driver for Low-Power Applications External Gate Driver for High-Power Applications		Cell Phone Base Stations High-Performance Offline AC/DC Converters Isolated DC-to-DC Modules (Bricks) Telecom and Network Systems

Diagram

Typical Operating Circuit

Application Notes

Application Note 2039: 50W Voltage-Mode Forward Converter Design with the MAX8541 - MAX8541 Application Note 2040: 50W Current-Mode Forward Converter Design with the MAX8540 - MAX8540

Reliability Reports

Show FIT data for: MAX8540 MAX8541 Request Reliability Report for: MAX8540 MAX8541

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-6 of 6

MAX8540	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8540EEE+			Active	QSOP;16 pin;30.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16+1*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8540EEE+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8540EEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8540EEE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8541	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8541EEE			Active	QSOP;16 pin;30.9 mm² Outline Drawing: 21-0055 (PDF) Land Pattern: 90-0167 (PDF) Use pkgcode/variation: E16-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8541EEE-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet

More Information

New Product Press Release 2003-05-09

Related Products

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