MAX8540EEE+ Maxim Integrated Products, MAX8540EEE+ Datasheet

IC PWM CTRLR CURR-MODE 16-QSOP

MAX8540EEE+

Manufacturer Part Number
MAX8540EEE+
Description
IC PWM CTRLR CURR-MODE 16-QSOP
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX8540EEE.pdf (16 pages)

Specifications of MAX8540EEE+

Pwm Type
Current Mode
Number Of Outputs
1
Frequency - Max
1MHz
Duty Cycle
82%
Voltage - Supply
7.6 V ~ 18 V
Buck
No
Boost
No
Flyback
Yes
Inverting
No
Doubler
No
Divider
Yes
Cuk
No
Isolated
Yes
Operating Temperature
-40°C ~ 85°C
Package / Case
16-QSOP
Frequency-max
1MHz
Duty Cycle (max)
80 %
Mounting Style
SMD/SMT
Switching Frequency
200 KHz to 1000 KHz
Maximum Operating Temperature
+ 85 C
Fall Time
53 ns
Minimum Operating Temperature
- 40 C
Rise Time
57 ns
Synchronous Pin
Yes
Topology
Flyback, Forward
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX8540/MAX8541 pulse-width-modulated (PWM)
controllers for forward/flyback isolated DC-to-DC convert-
ers provide maximum flexibility to power-supply design-
ers 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 pro-
tection (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 volt-
age 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 opti-
mize 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 dri-
vers 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.
19-2830; Rev 0; 4/03
Functional Diagrams and Typical Operating Circuit appear
at end of data sheet.
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Voltage-Mode PWM Controllers for Isolated Supplies
Isolated DC-to-DC Modules (Bricks)
Cellular Base Stations
Telecom and Network Systems
High-Performance Off-Line AC/DC Converters
Synchronizable, High-Frequency Current- and
________________________________________________________________ Maxim Integrated Products
General Description
Applications
♦ 200kHz to 1MHz Adjustable Switching Frequency
♦ Synchronization to External Clock
♦ Programmable, Constant Maximum Volt-Second
♦ Programmable Hiccup/Skip Cycles or Latch-Mode
♦ Clean Startups with High-Capacitance Loads
♦ Programmable Under/Overvoltage Protection
♦ Current-Mode, Adjustable Slope Compensation
♦ Voltage-Mode, Adjustable Ramp Magnitude
♦ 10mA, 5V Regulator
♦ 75mV to 1.25mV Adjustable Current Limit
♦ Internal Gate Driver for Low-Power Applications
♦ External Gate Driver for High-Power Applications
Pin Configurations continued at end of data sheet.
MAX8540EEE
MAX8541EEE
Simplifies Transformer Design
Protection
(MAX8540)
(MAX8541)
Reduces External Components
TOP VIEW
PART
FREQ/SYNC
MAXDTY
SCOMP
REF
OV
UV
SS
EN
1
2
3
4
5
6
8
7
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
MAX8540EEE
QSOP
Pin Configurations
16
15
14
13
12
11
10
9
V
DRV
GND
SKTON
CS
SKTOFF
ILIM
OPTO
CC
PIN-PACKAGE
16 QSOP
16 QSOP
Features
1

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MAX8540EEE+ Summary of contents

Page 1

... Telecom and Network Systems High-Performance Off-Line AC/DC Converters Functional Diagrams and Typical Operating Circuit appear at end of data sheet. ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. ♦ 200kHz to 1MHz Adjustable Switching Frequency ♦ ...

Page 2

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies ABSOLUTE MAXIMUM RATINGS V to GND ............................................................-0.3V to +20V CC OPTO, UV, OV, EN, PRAMP, ILIM, REF to GND ......-0.3V to +6V SCOMP, FREQ, CS, SKTON, SKTOFF, SS, MAXDTY to ...

Page 3

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies ELECTRICAL CHARACTERISTICS (continued 12V 1µ VCC REF 68kΩ 25kΩ, C SCOMP PRAMP SKTON noted. Typical values are ...

Page 4

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies ELECTRICAL CHARACTERISTICS (continued 12V 1µ VCC REF 68kΩ 25kΩ, C SCOMP PRAMP SKTON noted. Typical values are ...

Page 5

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies ELECTRICAL CHARACTERISTICS (continued 12V 1µ VCC REF 25kΩ 0.01µF, C PRAMP SKTON SKTOFF unless otherwise noted.) (Note ...

Page 6

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies (V = 12V +25°C, unless otherwise specified NO-LOAD SWITCHING CURRENT CC vs. TEMPERATURE 6.0 5.8 5.6 5.4 5.2 5.0 4.8 4.6 4.4 4 ...

Page 7

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies (V = 12V +25°C, unless otherwise specified FREQUENCY vs. INPUT VOLTAGE 1000 800 R = 10kΩ FREQ 600 400 R = 20kΩ FREQ 200 R = ...

Page 8

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies PIN NAME MAX8540 MAX8541 5V Reference Voltage Output. Bypass to ground with a 1µF capacitor. REF is pulled to GND 1 1 REF during shutdown. System Input Overvoltage Monitoring. The ...

Page 9

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies Detailed Description Overvoltage Threshold The MAX8540/MAX8541 include an overvoltage protec- tion (OVP) feature that turns off the external MOSFET when the input voltage exceeds the user-set threshold. Connect a resistor-divider ...

Page 10

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies The MAX8540/MAX8541 also synchronize with an external oscillator. Drive FREQ/SYNC with a square wave through a series diode with a positive pulse width of at least 200ns and a minimum ...

Page 11

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies where kΩ. The ramp-voltage magnitude is PRAMP independent of frequency. The range of values for R is from 12.4kΩ to 42kΩ. PRAMP The soft-start feature allows converters ...

Page 12

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies Pull through a 10kΩ pullup resistor to SKTOFF REF enable the latch-off feature. In this mode, once the SKTON time has elapsed, the IC is latched off. ...

Page 13

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies V UVLO COMPARATOR 8V OVERVOLTAGE 3.02V COMPARATOR OV UV 1.25V EN 1.2V SKTOFF SHORT-CIRCUIT SKTON TIMER CS ILIM SS SS_RESET REF Figure 2. MAX8540 Functional Diagram ______________________________________________________________________________________ ...

Page 14

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies V UVLO COMPARATOR 8V OVERVOLTAGE 3.02V COMPARATOR OV UV 1.25V EN 1.2V SKTOFF SHORT-CIRCUIT SKTON TIMER CS ILIM SS SS_RESET REF Figure 3. MAX8541 Functional Diagram 14 ...

Page 15

Synchronizable, High-Frequency Current- and Voltage-Mode PWM Controllers for Isolated Supplies INPUT 36V TO 76V MAX8515 OPTIONAL OV SYNCHRONIZATION UV FREQ/SYNC U1 SS REF MAX8540 ILIM SCOMP OPTO OFF ON ______________________________________________________________________________________ OUT IN FB VIN PGND GND V CC DRV CS ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2003 Maxim Integrated Products PACKAGE OUTLINE, QSOP .150" ...

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