Rainbow Electronics MAX15001 - Manual

General Description
The MAX15000/MAX15001 current-mode PWM con-
trollers contain all the control circuitry required for the
design of wide-input-voltage isolated and nonisolated
power supplies. The MAX15000 is well suited for uni-
versal 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 volt-
age 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 volt-
age 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 start-
up. The MAX15001 does not have the internal bootstrap
UVLO and can be biased directly from a minimum volt-
age 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% maxi-
mum 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.
Applications
1/2, 1/4, and 1/8th Brick Power Modules
High-Efficiency, Isolated Telecom Power
Supplies
Networking/Servers
Isolated Keep-Alive Power Supplies
12V Boost and SEPIC Regulators
Isolated and Nonisolated High-Brightness LED
Power Supplies
Industrial Power Conversion
Features
♦ 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
MAX15000/MAX15001
Current-Mode PWM Controllers with
Programmable Switching Frequency
________________________________________________________________ Maxim Integrated Products 1
1
2
3
4
5
10
9
8
7
6
IN
V CC
NDRV
GND COMP
FB
UFLG
UVLO/EN
MAX15000
MAX15001
µMAX
TOP VIEW
RT CS
Pin Configuration
Ordering Information
19-3957; Rev 0; 1/06
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.
Warning: The MAX15000/MAX15001 are designed to work with
high voltages. Exercise caution.
+Denotes lead-free package.
Selector Guide appears at end of data sheet.
PART TEMP RANGE
PIN-
PACKAGE PKG
CODE
MAX15000AEUB+ -40°C to +85°C 10 µMAX U10-2
MAX15000BEUB+ -40°C to +85°C 10 µMAX U10-2
MAX15001AEUB+ -40°C to +85°C 10 µMAX U10-2
MAX15001BEUB+ -40°C to +85°C 10 µMAX U10-2
µMAX is a registered trademark of Maxim Integrated Products, Inc.