Rainbow Electronics MAX15001 User Manual

General Description

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 10­pin 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

GNDCOMP

FB

UFLG

UVLO/EN

MAX15000
MAX15001

µMAX

TOP VIEW

RTCS

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

PIN-

PKG

CODE

MAX15000AEUB+

10 µMAX U10-2

MAX15000BEUB+

10 µMAX U10-2

MAX15001AEUB+

10 µMAX U10-2

MAX15001BEUB+

10 µMAX U10-2

µMAX is a registered trademark of Maxim Integrated Products, Inc.

TEMP RANGE

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

-40°C to +85°C

PACKAGE

MAX15000/MAX15001

Current-Mode PWM Controllers with
Programmable Switching Frequency

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VIN= +12V (for MAX15000, bring VINup to 23.6V for startup), 10nF bypass capacitors at IN and VCC, R12 = 15kΩ (MAX1500_A), R12
= 7.5kΩ (MAX1500_B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit), NDRV = open, V

UVLO/EN

= +1.4V, VFB= +1.0V,

COMP = open, V

CS

= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.

IN to GND ...............................................................-0.3V to +30V

IN Clamp (Internal Shunt) Current ........................................5mA

V

CC

to GND............................................................-0.3V to +13V

FB, COMP, UVLO/EN, RT, CS to GND .....................-0.3V to +6V

UFLG to GND .........................................................-0.3V to +30V

NDRV to GND ............................................-0.3V to (VCC+ 0.3V)

Continuous Power Dissipation (T

A

= +70°C)

10-Pin µMAX (derate 5.6mW/°C above +70°C) ........444.4mW

Operating Temperature Range ...........................-40°C to +85°C

Storage Temperature Range ............................-65°C to +150°C

Junction Temperature......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

PARAMETER

CONDITIONS MIN TYP MAX

UNITS

UVLO/STARTUP

Bootstrap UVLO Wake-Up Level V

SUVR

VIN rising (MAX15000 only)

21.6

V

Bootstrap UVLO Shutdown Level

V

SUVF

VIN falling (MAX15000 only) 9.05 9.74

V

UVLO/EN Wake-Up Threshold V

ULR2

UVLO/EN rising

1.23

V

UVLO/EN Shutdown Threshold V

ULF2

UVLO/EN falling 1.14 1.17 1.20 V

UVLO/EN Input Current I

UVLO

V

UVLO/EN

≤ 2V -50 +50 nA

UVLO/EN Hysteresis 60 mV

IN Supply Current In UVLO I

START

VIN = 19V, MAX15000 only when in
bootstrap UVLO

50 90 µA

IN Input Voltage Range V

IN

MAX15001 only 9.5 24.0 V

UVLO/EN steps up from 1V to 1.4V 3

UVLO/EN to UFLG Propagation
Delay (Figure 3)

UVLO/EN steps down from 1.4V to 1V 0.6

µs

t

EXTR

UVLO/EN steps up from 1V to 1.4V 3 10 ms

UVLO/EN to NDRV Propagation
Delay (Figure 3)

t

EXTF

UVLO/EN steps down from 1.4V to 1V 150 210 300 µs

t

BUVR

VIN steps up from 9V to 24V (MAX15000
only)

5

Bootstrap UVLO Propagation
Delay

t

BUVF

VIN steps down from 24V to 9V
(MAX15000 only)

1

µs

UFLG Low Output Voltage V

UFLGIUFLG

= 5mA sinking 0.8 V

UFLG High Output Leakage
Current

V

UFLG

= 25V 0.1 1 µA

INTERNAL SUPPLY

VCC Regulator Set Point V

CCSP

VIN = 10.8V to 24V, sinking 1µA to 20mA
from V

CC

7.0 10.5 V

IN Supply Current After Startup I

IN

VIN = 24V 2 4 mA

Shutdown Supply Current UVLO/EN = low 50 90 µA

SYMBOL

19.68

1.218

23.60

10.43

1.242

MAX15000/MAX15001

Current-Mode PWM Controllers with

Programmable Switching Frequency

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +12V (for MAX15000, bring VINup to 23.6V for startup), 10nF bypass capacitors at IN and VCC, R12 = 15kΩ (MAX1500_A), R12
= 7.5kΩ (MAX1500_B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit), NDRV = open, V

UVLO/EN

= +1.4V, VFB= +1.0V,

COMP = open, V

CS

= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

PARAMETER

CONDITIONS MIN TYP MAX

UNITS

GATE DRIVER

)

Measured at NDRV sinking 100mA 2 4

Driver Output Impedance

)

Measured at NDRV sourcing 20mA 4 10

Ω

Driver Peak Sink Current 1A

Driver Peak Source Current 0.65 A

PWM COMPARATOR

Comparator Offset Voltage V

PWM

V

COMP

- V

CS

1.24 1.38 1.54 V

CS Input Bias Current I

CS

VCS = 0V -4 +4 µA

Comparator Propagation Delay t

PWM

Change in VCS = 0.1V 60 ns

CURRENT-LIMIT COMPARATOR

Current-Limit Trip Threshold V

CS

900

1100 mV

CS Input Bias Current I

CS

VCS = 0V -4 +4 µA

Propagation Delay From
Comparator Input to NDRV

t

PDCS

100mV overdrive 60 ns

IN CLAMP VOLTAGE

IN Clamp Voltage V

INC

2mA sink current (Note 2) 24.1 26.1 29.0 V

ERROR AMPLIFIER

Voltage Gain R

LOAD

= 100kΩ 80 dB

Unity-Gain Bandwidth R

LOAD

= 100kΩ, C

LOAD

= 200pF 2

MHz

Phase Margin R

LOAD

= 100kΩ, C

LOAD

= 200pF 65

degrees

FB Input Offset Voltage ±1 mV

COMP High Voltage I

COMP

= 0 2.8

COMP Low Voltage I

COMP

= 0 1.1

V

Source Current 0.5 mA

Sink Current 0.5 mA

Reference Voltage V

REF

(Note 3)

V

Reference Voltage Accuracy -1.5 +1.5 %

FB Input Bias Current -50 +50 nA

COMP Short-Circuit Current 8mA

DIGITAL SOFT-START

NDRV

cycles

Soft-Start Duration t

SS

fSW = 350kHz 5.6 ms

Reference Voltage Steps During
Soft-Start

31

steps

Reference Voltage Step

mV

SYMBOL

R

ON(LOW

R

ON(HIGH

1000

1.230

1984

39.67

MAX15000/MAX15001

Current-Mode PWM Controllers with
Programmable Switching Frequency

4 _______________________________________________________________________________________

Note 1: All devices are 100% tested at TA= +85°C. All limits over temperature are guaranteed by characterization.
Note 2: The MAX15000 is intended for use in universal input power supplies. The internal clamp circuit at IN is used to prevent the

bootstrap capacitor (C1 in Figure 1) from charging to a voltage beyond the absolute maximum rating of the device when
UVLO/EN is low (shutdown mode). Externally limit the maximum current to IN (hence to clamp) to 2mA maximum when
UVLO/EN is low. Clamp currents higher than 2mA may result in a clamp voltage higher than 30V, thus exceeding the
absolute maximum rating for IN. For the MAX15001, do not exceed the 24V maximum operating voltage of the device.

Note 3: V

REF

is measured with FB connected to COMP (see the Functional Diagram).

Note 4: The oscillator in the MAX1500_A is capable of operating up to 2500kHz. However, the NDRV switching frequency is limited

to operate up to 625kHz. Thus, the oscillator frequency for MAX1500_A must be limited to 1250kHz (maximum).

ELECTRICAL CHARACTERISTICS (continued)

(VIN= +12V (for MAX15000, bring VINup to 23.6V for startup), 10nF bypass capacitors at IN and VCC, R12 = 15kΩ (MAX1500_A), R12
= 7.5kΩ (MAX1500_B), R15 = 1kΩ, C6 = 100nF (see the Typical Application Circuit), NDRV = open, V

UVLO/EN

= +1.4V, VFB= +1.0V,

COMP = open, V

CS

= 0V, TA= -40°C to +85°C, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

BOOTSTRAP UVLO WAKE-UP LEVEL

vs. TEMPERATURE

MAX15000 toc01

TEMPERATURE (°C)

V

IN

(V)

603510-15

21.4

21.5

21.6

21.7

21.8

21.3

-40 85

MAX15000 VIN RISING

BOOTSTRAP UVLO SHUTDOWN LEVEL

vs. TEMPERATURE

MAX15000 toc02

TEMPERATURE (°C)

V

IN

(V)

603510-15

9.5

9.7

9.9

10.1

10.3

9.3

-40 85

MAX15000 VIN FALLING

UVLO/EN WAKE-UP THRESHOLD

vs. TEMPERATURE

MAX15000 toc03

TEMPERATURE (°C)

UVLO/EN (V)

603510-15

1.226

1.228

1.230

1.232

1.234

1.236

1.224

-40 85

UVLO/EN RISING

Typical Operating Characteristics

(V

UVLO/EN

= +1.4V, VFB= +1V, COMP = open, VCS= 0V, TA= +25°C, unless otherwise noted.)

PARAMETER

SYMBOL

CONDITIONS MIN TYP MAX

UNITS

OSCILLATOR

Oscillator Frequency Range f

OSC

50 2500 kHz

f

OSC

= 200kHz to 800kHz -10 +10

Oscillator Frequency Accuracy

f

OSC

= 50kHz to 2500kHz -20 +20

%

MAX1500_A, fSW = f

OSC

/2 25 625

NDRV Switching Frequency
(Note 4)

f

SW

MAX1500_B, fSW = f

OSC

/4 12.5

kHz

MAX1500_A 50

Maximum Duty Cycle D

MAX

MAX1500_B 75

%

625.0

MAX15000/MAX15001

Current-Mode PWM Controllers with

Programmable Switching Frequency

_______________________________________________________________________________________ 5

UVLO/EN SHUTDOWN THRESHOLD

vs. TEMPERATURE

MAX15000 toc04

TEMPERATURE (°C)

V

UVLO/EN

(V)

603510-15

1.155

1.160

1.165

1.170

1.175

1.180

1.150

-40 85

UVLO/EN FALLING

VIN SUPPLY CURRENT IN UVLO

vs. TEMPERATURE

MAX15000 toc05

TEMPERATURE (°C)

I

START

(µA)

603510-15

50

55

60

65

45

-40 85

VIN = 19V
MAX15000 WHEN IN
BOOTSTRAP UVLO

VIN SUPPLY CURRENT AFTER
STARTUP vs. TEMPERATURE

MAX15000 toc06

TEMPERATURE (°C)

I

IN

(mA)

603510-15

1.6

1.7

1.8

1.9

2.0

1.5

-40 85

VIN = 24V
f

SW

= 350kHz

VCC REGULATOR SET POINT

vs. TEMPERATURE

MAX15000 toc07

TEMPERATURE (°C)

V

CC

(V)

603510-15

9.2

9.4

9.6

9.8

9.0

-40 85

VIN = 19V

NDRV NOT SWITCHING

NDRV SWITCHING

f

SW

= 350kHz

VCC REGULATOR SET POINT

vs. TEMPERATURE

MAX15000 toc08

TEMPERATURE (°C)

V

CC

(V)

6040-20 0 20

8.2

8.3

8.4

8.5

8.6

8.7

8.8

8.9

8.1

-40 80

10mA LOAD

VIN = 19V

20mA LOAD

CURRENT-LIMIT TRIP THRESHOLD

vs. TEMPERATURE

MAX15000 toc09

TEMPERATURE (°C)

CURRENT-LIMIT TRIP THRESHOLD (V)

603510-15

0.97

0.98

0.99

1.00

1.01

1.02

0.96

-40 85

-3σ

MEAN

+3σ

TOTAL NUMBER OF DEVICES = 140

CURRENT-LIMIT TRIP THRESHOLD

MAX15000 toc10

CURRENT-LIMIT TRIP THRESHOLD (V)

PERCENTAGE OF UNITS (%)

1.0220.993 1.0070.978

10

20

30

40

50

60

0

0.964 1.036

TOTAL NUMBER
OF DEVICES = 140

SWITCHING FREQUENCY

vs. TEMPERATURE

MAX15000 toc11

TEMPERATURE (°C)

SWITCHING FREQUENCY (kHz)

603510-15

330

335

340

345

350

355

325

-40 85

-3σ

MEAN

+3σ

TOTAL NUMBER OF DEVICES = 140

SWITCHING FREQUENCY

MAX15000 toc12

SWITCHING FREQUENCY (kHz)

PERCENTAGE OF UNITS (%)

354.0340.3 347.2333.5

10

20

30

40

50

60

0

326.7 360.8

TOTAL NUMBER
OF DEVICES = 140

Typical Operating Characteristics (continued)

(V

UVLO/EN

= +1.4V, VFB= +1V, COMP = open, VCS= 0V, TA= +25°C, unless otherwise noted.)

MAX15000/MAX15001

Current-Mode PWM Controllers with
Programmable Switching Frequency

6 _______________________________________________________________________________________

SWITCHING FREQUENCY

vs. TIMING RESISTOR

MAX15000 toc13

TIMING RESISTOR (kΩ)

SWITCHING FREQUENCY (kHz)

10010

100

10001

1000

10

MAX15000A

PROPAGATION DELAY FROM

CURRENT-LIMIT COMPARATOR

INPUT TO NDRV vs. TEMPERATURE

MAX15000 toc14

TEMPERATURE (°C)

t

PDCS

(ns)

603510-15

45

50

55

60

40

-40 85

UVLO/EN TO NDRV PROPAGATION DELAY

vs. TEMPERATURE

MAX15000 toc15

TEMPERATURE (°C)

UVLO DELAY (ms)

603510-15

1

2

3

4

5

6

0

-40 85

UVLO/EN RISING

UVLO/EN FALLING

206µs

UVLO/EN TO UFLG PROPAGATION DELAY

vs. TEMPERATURE

MAX15000 toc16

TEMPERATURE (°C)

UVLO DELAY (µs)

603510-15

1

2

3

4

5

6

0

-40 85

UVLO/EN RISING

UVLO/EN FALLING

REFERENCE VOLTAGE

vs. TEMPERATURE

MAX15000 toc17

TEMPERATURE (°C)

REFERENCE VOLTAGE (V)

603510-15

1.229

1.230

1.231

1.232

1.228

-40 85

VIN = 12V

INPUT CURRENT

vs. IN VOLTAGE

MAX15000 toc18

IN VOLTAGE (V)

INPUT CURRENT (mA)

1817161514131211

1.64

1.68

1.72

1.76

1.80

1.60
10 19

UVLO/EN = 1.4V
NDRV SWITCHING AT 350kHz

INPUT CLAMP VOLTAGE

vs. TEMPERATURE

MAX15000 toc19

TEMPERATURE (°C)

INPUT CLAMP VOLTAGE (V)

6040200-20

25.2

25.4

25.6

25.8

26.0

26.2

26.4

26.6

26.8

27.0

25.0

-40 80

IIN = 2mA

NDRV LOW OUTPUT IMPEDANCE

vs. TEMPERATURE

MAX15000 toc20

TEMPERATURE (°C)

R

ON

(Ω)

603510-15

1.4

1.6

1.8

2.0

2.2

2.4

1.2

-40 85

VIN = 24V
SINKING 100mA

Typical Operating Characteristics (continued)

(V

UVLO/EN

= +1.4V, VFB= +1V, COMP = open, VCS= 0V, TA= +25°C, unless otherwise noted.)