MAX17500AEVKIT+ Maxim Integrated Products, MAX17500AEVKIT+ Datasheet

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MAX17500AEVKIT+

Manufacturer Part Number
MAX17500AEVKIT+
Description
Power Management Modules & Development Tools MAX17500A EVAL KIT MAX17500A EVAL KIT
Manufacturer
Maxim Integrated Products
Datasheet
1.MAX17499AEUB.pdf (18 pages)

Specifications of MAX17500AEVKIT+

Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX17499/MAX17500 current-mode PWM con-
trollers contain all the control circuitry required for the
design of wide-input-voltage isolated and nonisolated
power supplies. The MAX17499 is well suited for low
input voltage (9.5V DC to 24V DC) power supplies. The
MAX17500 is well suited for universal input (rectified
85V AC to 265V AC) or telecom (-36V DC to -72V DC)
power supplies.
The ICs contain an internal error amplifier that regulates
the tertiary winding output voltage that is used in prima-
ry-side-regulated isolated power supplies. Primary-side
regulation eliminates the need for an optocoupler. An
input undervoltage lockout (UVLO) is provided for pro-
gramming 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 programma-
ble with a voltage-divider. A UVLO/EN input is used to
shut down the devices. Internal digital soft-start elimi-
nates output voltage overshoot.
The MAX17500 has an internal bootstrap UVLO with
large hysteresis that requires a minimum 23.6V for start-
up. The MAX17499 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 ICs is programmable
with an external resistor. The MAX17499A/MAX17500A
provide a 50% maximum duty-cycle limit, while the
MAX17499B/MAX17500B provide a 75% maximum
duty-cycle limit. These devices are available in 10-pin
μMAX
-40°C to +85°C temperature range.
19-5485; Rev 0; 9/10
Selector Guide appears at end of data sheet.
μMAX is a registered trademark of Maxim Integrated Products, Inc.
Warning: The ICs are designed to work with high voltages. Exercise caution.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
MAX17499AEUB+
MAX17499BEUB+
MAX17500AEUB+
MAX17500BEUB+
®
PART
packages and are rated for operation over the
________________________________________________________________ Maxim Integrated Products
General Description
D
Programmable Switching Frequency
MAX
Current-Mode PWM Controllers with
75
50
75
50
(%)
STARTUP VOLTAGE (V)
9.5
9.5
22
22
o Current-Mode Control
o Programmable Switching Frequency Up to 625kHz
o Accurate UVLO Threshold (1%)
o Open-Drain UVLO Flag Output with Internal Delay
o 36V to 72V Telecom Voltage Range
o Universal Offline Input Voltage Range
o 9.5V to 24V Input (MAX17499)
o Digital Soft-Start
o Internal Bootstrap UVLO with Large Hysteresis
o Internal Error Amplifier with 1.5% Accurate
o 50µA (typ) Startup Supply Current
o 50% Maximum Duty-Cycle Limit
o 75% Maximum Duty-Cycle Limit
o 60ns Cycle-by-Cycle Current-Limit Propagation
o Available in Tiny 10-Pin µMAX Packages
(MAX17500)
Reference
(MAX17499A/MAX17500A)
(MAX17499B/MAX17500B)
Delay
Rectified 85V AC to 265V AC (MAX17500)
1/2, 1/4, and 1/8 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
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
TEMP RANGE
Ordering Information
Applications
PIN-PACKAGE
Features
10 μMAX
10 μMAX
10 μMAX
10 μMAX
1

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MAX17500AEVKIT+ Summary of contents

Page 1

... MAX17499B/MAX17500B 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. Selector Guide appears at end of data sheet. μMAX is a registered trademark of Maxim Integrated Products, Inc. PART D (%) MAX MAX17499AEUB+ 50 ...

Page 2

Current-Mode PWM Controllers with Programmable Switching Frequency ABSOLUTE MAXIMUM RATINGS IN to GND ...............................................................-0.3V to +30V IN Clamp (internal shunt) Current .........................................5mA V to GND ............................................................-0.3V to +13V CC FB, COMP, UVLO/EN, RT GND .....................-0.3V to +6V UFLG ...

Page 3

Current-Mode PWM Controllers with Programmable Switching Frequency ELECTRICAL CHARACTERISTICS (continued +12V (for MAX17500, bring MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ 100nF (see the Typical Application Circuit ), NDRV = open, V ...

Page 4

Current-Mode PWM Controllers with Programmable Switching Frequency ELECTRICAL CHARACTERISTICS (continued +12V (for MAX17500, bring MAX17500A), R12 = 7.5kΩ (MAX17499B/MAX17500B), R15 = 1kΩ 100nF (see the Typical Application Circuit ), NDRV = open, V ...

Page 5

Current-Mode PWM Controllers with Programmable Switching Frequency (V = +1.4V +1V, COMP = open, V UVLO/EN FB UVLO/EN SHUTDOWN THRESHOLD vs. TEMPERATURE 1.180 UVLO/EN FALLING 1.175 1.170 1.165 1.160 1.155 1.150 -40 - TEMPERATURE ...

Page 6

Current-Mode PWM Controllers with Programmable Switching Frequency (V = +1.4V +1V, COMP = open, V UVLO/EN FB SWITCHING FREQUENCY vs. TIMING RESISTOR 1000 MAX17499A/MAX17500A 100 100 1000 TIMING RESISTOR (kΩ) UVLO/EN-TO-UFLG PROPAGATION DELAY vs. TEMPERATURE ...

Page 7

Current-Mode PWM Controllers with Programmable Switching Frequency (V = +1.4V +1V, COMP = open, V UVLO/EN FB NDRV HIGH-OUTPUT IMPEDANCE vs. TEMPERATURE 5.0 SOURCING 20mA 4.6 4.2 3.8 3.4 3.0 -40 - TEMPERATURE (°C) PIN NAME ...

Page 8

Current-Mode PWM Controllers with Programmable Switching Frequency PIN NAME 7 GND Ground Connection 8 NDRV External n-Channel MOSFET Gate Connection Gate-Drive Supply. Internally generated supply from IN. Decouple GND. IN Supply. Decouple with a 10nF ...

Page 9

Current-Mode PWM Controllers with Programmable Switching Frequency Power supplies designed with the MAX17500 use a high-value startup resistor, R1, that charges a reservoir capacitor, C1 (see Figure 1). During this initial period, while the voltage is less than the internal ...

Page 10

Current-Mode PWM Controllers with Programmable Switching Frequency MAX17499/MAX17500 fig02 100ms/div Figure 2. V and V During Startup When Using the IN CC MAX17500 in Bootstrapped Mode (Figure 1) For the MAX17500, the voltage normally derived from a ...

Page 11

Current-Mode PWM Controllers with Programmable Switching Frequency The devices’ soft-start feature allows the output voltage to ramp controlled manner, eliminating voltage overshoot. The devices’ reference generator that is internally connected to the error amplifier soft-starts to achieve ...

Page 12

Current-Mode PWM Controllers with Programmable Switching Frequency circuit in Figure 6, calculate the output voltage using the following equation: ⎡ ⎛ ⎞ ⎢ ⎝ ⎜ ⎠ ⎟ OUT REF N R ...

Page 13

Current-Mode PWM Controllers with Programmable Switching Frequency Choose a higher value for R1 than the one calculated in the previous equation if a longer startup time can be tolerated to minimize power loss on this resistor. The above startup method ...

Page 14

Current-Mode PWM Controllers with Programmable Switching Frequency FB_P IN D8 C16 C12 1μF 15μF R6 35V 35V +VIN 33kΩ 36V TO 72V +VIN C1 C2 -VIN 1μF 1μF 100V 100V FB_P R1 22.6kΩ +VIN ...

Page 15

Current-Mode PWM Controllers with Programmable Switching Frequency 12V Figure 8. 12V to 15V Output Boost Regulator Figure 8 shows the 12V to 15V output boost regulator. Layout Recommendations Typically, there are two sources of noise emission in ...

Page 16

Current-Mode PWM Controllers with Programmable Switching Frequency 36V TO 72V C5 R11 - ______________________________________________________________________________________ R5 UVLO/ UFLG MAX17500 NDRV COMP GND ...

Page 17

Current-Mode PWM Controllers with Programmable Switching Frequency IN IN CLAMP 26.1V DIGITAL SOFT-START UVLO/EN COMP FB ERROR AMP 1. Selector Guide BOOTSTRAP STARTUP PART* UVLO VOLTAGE (V) MAX17499A No MAX17499B No MAX17500A Yes MAX17500B Yes * ...

Page 18

... 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. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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