MAXIM MAX5014, MAX5015 User Manual

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General Description

The MAX5014/MAX5015 integrate all the building
blocks necessary for implementing DC-DC fixed-fre­quency isolated power supplies. These devices are
current-mode controllers with an integrated high-volt­age startup circuit suitable for isolated telecom/industri­al voltage range power supplies. Current-mode control
with leading-edge blanking simplifies control-loop
design and internal ramp compensation circuitry stabi­lizes the current loop when operating at duty cycles
above 50% (MAX5014). The MAX5014 allows 85%
operating duty cycle and could be used to implement
flyback converters, whereas the MAX5015 limits the
operating duty cycle to less than 50% and can be used
in single-ended forward converters. A high-voltage
startup circuit allows these devices to draw power
directly from the 18V to 110V input supply during start­up. The switching frequency is internally trimmed to
275kHz ±10%, thus reducing magnetics and filter com­ponent costs.

The MAX5014/MAX5015 are available in 8-pin SO
packages. An evaluation kit (MAX5015EVKIT) is also
available.

Warning: The MAX5014/MAX5015 are designed to
operate with high voltages. Exercise caution.

Applications

Telecom Power Supplies

Industrial Power Supplies

Networking Power Supplies

Isolated Power Supplies

Features

♦ Wide Input Range: (18V to 110V) or (13V to 36V)

♦ Current-Mode Control

♦ Leading-Edge Blanking

♦ Internally Trimmed 275kHz ±10% Oscillator

♦ Low External Component Count

♦ Soft-Start

♦ High-Voltage Startup Circuit

♦ Pulse-by-Pulse Current Limiting

♦ Thermal Shutdown

♦ SO-8 Package

MAX5014/MAX5015

Current-Mode PWM Controllers with Integrated

Startup Circuit for Isolated Power Supplies

________________________________________________________________ Maxim Integrated Products 1

Pin Configuration

Ordering Information

MAX5015

V

DD

V+

SS_SHDN

NDRV

CS

GND

V

CC

OPTO

V

IN

V

OUT

OPTOCOUPLER

Typical Operating Circuit

19-2082; Rev 0; 7/01

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.

EVALUATION KIT

AVAILABLE

*See Selector Guide at end of data sheet.

PART TEMP. RANGE PIN-PACKAGE

MAX5014CSA* 0°C to +70°C8-SO

MAX5014ESA* -40°C to +85°C8-SO
MAX5015CSA* 0°C to +70°C8-SO
MAX5015ESA* -40°C to +85°C8-SO

TOP VIEW

V+

1

2

DD

OPTO

SS_SHDN

MAX5014/

MAX5015

3

4

8-SO

87V

6

5

CC

NDRVV

GND

CS

MAX5014/MAX5015

Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(VDD= 13V, a 10µF capacitor connects VCCto GND, VCS= 0, V+ = 48V, 0.1µF capacitor connected to SS_SHDN, NDRV = open cir­cuit, OPTO = GND, T

A

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

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.

V+ to GND……………………………………...……-0.3V to +120V
V

DD

to GND.………………………………….……….-0.3V to +40V

V

CC

to GND.………………….……………………-0.3V to +12.5V

OPTO, NDRV, SS_SHDN, CS to GND .……-0.3V to V

CC

+ 0.3V

V

DD

and VCCCurrent …………………...…………………..20mA
NDRV Current Continuous...………………………………….25mA
NDRV Current for Less than 1µs..………….…………….……±1A

Continuous Power Dissipation (T

A

= +70°C)

8-Pin SO (derate 5.88mW/°C above +70°C) .………....471mW

Operating Temperature Range…………..……...-40°C to +85°C
Storage Temperature Range……………..…….-65°C to +150°C
Lead Temperature (soldering, 10s) ………………………+300°C

)

)

)

SUPPLY CURRENT

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

V+ Supply Current

V+ Supply Current After Startup V+ = 110V, VDD = 13V, V

V

S up p l y C ur r ent

D D

V+ Shutdown Current V

VDD Shutdown Current V

PREREGULATOR/STARTUP

V+ Input Voltage 18 110 V

V

Supply Voltage 13 36 V

DD

INTERNAL REGULATORS (VCC)

VCC Output Voltage

VCC Undervoltage Lockout V

OUTPUT DRIVER

Peak Source Current VCC = 11V, (externally forced) 570 mA

Peak Sink Current VCC = 11V, (externally forced) 1000 mA

NRDV High-Side Driver
Resistance

I

V+(NS

I

V+(S)

I

VDD(NS

I

VDD(S

CC_UVLOVCC

R

OH

VDD = 0, V+ = 110V, driver not switching 0.85 1.3

V+ = 110V, VDD = 0, V
driver switching

VDD = 36V, driver not switching 0.9 1.3

VDD = 36V, driver switching, V

SS_SHDN

SS_SHDN

Powered from V+, ICC = 7.5mA, VDD = 0 7.5 9.8 12 V

Powered from V

VCC = 11V, externally forced,
NDRV sourcing 50mA

= 0, V+ = 110V 190 290 µA

= 0 8 20 µA

, ICC = 7.5mA 9.0 10.0 11.0 V

DD

falling 6.6 V

= 4V,

OPTO

= 4V 11 µA

OPTO

= 4V 1.9 2.7

OPTO

1.4 2.6

412Ω

mA

mA

NDRV Low Side Driver
Resistance

PWM COMPARATOR

OPTO Input Bias C ur r ent V

OPTO Control Range 23V

Slope Compensation V

R

OL

SCOMP

VCC = 11V, externally forced,
NDRV sinking 50mA

OPTO = VSS_SHDN

MAX5014 26 mV/µs

-1.00 1.00 µA

1.6 4 Ω

MAX5014/MAX5015

Current-Mode PWM Controllers with Integrated

Startup Circuit for Isolated Power Supplies

_______________________________________________________________________________________ 3

ELECTRICAL CHARACTERISTICS (continued)

(VDD= 13V, a 10µF capacitor connects VCCto GND, VCS= 0, V+ = 48V, 0.1µF capacitor connected to SS_SHDN, NDRV = open cir­cuit, OPTO = GND, T

A

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

Typical Operating Characteristics

(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)

0.999

1.000

1.001

1.002

1.003

-40 0-20 20 40 60 80

V

SS_SHDN

vs. TEMPERATURE

(AT THE END OF SOFT-START)

MAX5014 toc01

TEMPERATURE (°C)

OPTO = CS = GND

V

SS_SHDN

(V) (NORMALIZED TO V

REF

= 2.4V)

273

274

276

275

277

278

-40 0-20 20 40 60 80

NDRV FREQUENCY vs.

TEMPERATURE

MAX5014 toc02

TEMPERATURE (°C)

NDRV FREQUENCY (kHz)

V

OPTO

= 4V, CS = GND

80.4

80.6

80.5

80.8

80.7

80.9

81.0

-40 20 40-20 0 60 80

MAX5014 MAXIMUM DUTY CYCLE

vs. TEMPERATURE

MAX5014 toc03

TEMPERATURE (°C)

MAXIMUM DUTY CYCLE (%)

V

OPTO

= 4V, CS = GND

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

THERMAL SHUTDOWN

Thermal Shutdown Temperature 150 ° C
Thermal Hysteresis 25 °C

CURRENT LIMIT

CS Threshold Voltage V
CS Input Bias Current 0 ≤ VCS ≤ 2V, V

Current Limit Comparator
Propagation Delay

CS Blanking Time V

OSCILLATOR

Clock Frequency Range V

Max Duty Cycle

SOFT-START

SS Source Current I

SS Sink Current 1.0 mA

Peak Soft-Start Voltage Clamp No external load 2.331 2.420 2.500 V

Shutdown Threshold

V

ILIM

SSO

= 4V 419 465 510 mV

OPTO

= 4V -1 1 µA

OPTO

25mV overdrive on CS, V

= 4V 70 ns

OPTO

= 4V 247 275 302 kHz

OPTO

MAX5014, V

MAX5015, V

V

SS_SHDN

V

SS_SHDN

V

SS_SHDN

= 4V 75 85

OPTO

= 4V 44 50

OPTO

= 0 2.0 4.6 6.5 µA

falling 0.25 0.37 0.41

rising 0.53 0.59 0.65

= 4V 180 ns

OPTO

%

V

MAX5014/MAX5015

Current-Mode PWM Controllers with Integrated
Startup Circuit for Isolated Power Supplies

4 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)

MAX5015 MAXIMUM DUTY CYCLE

vs. TEMPERATURE

48.0

47.8

V

= 4V, CS = GND

OPTO

47.6

47.4

47.2

MAX DUTY CYCLE (%)

47.0

46.8

-40 20 40-20 0 60 80
TEMPERATURE (°C)

MAX5014 toc04

V+ INPUT CURRENT (mA)

V+ INPUT CURRENT vs.

TEMPERATURE (AFTER STARTUP)

11.25

11.20

11.15

11.10

V+ INPUT CURRENT (µA)

11.05

11.00

-40 0-20 20 40 60 80

V+ = 110V, V
CS = GND, V

TEMPERATURE (°C)

OPTO
DD

= 4V,

= 13V

MAX5014 toc07

V+ SHUTDOWN CURRENT (µA)

1.46

1.45

1.44

1.43

1.42

1.41

1.40

1.39

1.38

-40 0 20-20

195

194

193

192

191

190

189

188

187

186

185

-40 -20 0 20 40 60 80

V+ SUPPLY CURRENT

vs. TEMPERATURE

V

= 4V, VDD = CS = GND

OPTO

40

TEMPERATURE (°C)

V+ SHUTDOWN CURRENT

vs. TEMPERATURE

V+ = 110V, OPTO = SS_SHDN =
CS = GND, V

= 13V

DD

TEMPERATURE (°C)

60 80

5.00

4.95

MAX5014 toc05

4.90

4.85

4.80

4.75

4.70

4.65

4.60

SOFT-START SOURCE CURRENT (µA)

4.55

4.50

-40-200 20406080

0.488

MAX5014 toc08

0.487

0.486

0.485

CS THRESHOLD VOLTAGE (V)

0.484

0.483

-40 0-20 20 40 60 80

SOFT-START SOURCE CURRENT

vs. TEMPERATURE

VDD = 0, V+ = 110V, OPTO =
CS = SS_SHDN = GND

TEMPERATURE (°C)

CS THRESHOLD VOLTAGE

vs. TEMPERATURE

V

= 4V, V+ = 110V

OPTO

TEMPERATURE (°C)

MAX5014 toc06

MAX5014 toc09

NDRV RESISTANCE (Ω)

5.0

4.5

4.0

3.5

3.0

2.5

2.0

1.5

1.0

-40 0 20-20

NDRV RESISTANCE
vs. TEMPERATURE

HIGH-SIDE DRIVER

LOW-SIDE DRIVER

40

TEMPERATURE (°C)

60 80

190

188

MAX5014 toc10

186

184

182

180

178

176

CURRENT LIMIT DELAY (ns)

174

172

170

CURRENT-LIMIT DELAY

vs. TEMPERATURE

V

= 4V, 100mV OVERDRIVE ON CS

OPTO

-40 -20 0 20 40 60 80

TEMPERATURE (°C)

MAX5014 toc11

V

2.410

2.408

(V)

2.406

SS_SHDN

V

2.404

2.402

2.400
010155 2025303540

SS_SHDN

VDD (V)

vs. V

DD

MAX5014 toc12

_______________________________________________________________________________________ 5

MAX5014/MAX5015

Current-Mode PWM Controllers with Integrated

Startup Circuit for Isolated Power Supplies

Typical Operating Characteristics (continued)

(V+ = 48V, VDD= 13V, NRDV is open circuit, TA= +25°C, unless otherwise noted.)

267.0

268.0

267.5

269.0

268.5

269.5

270.0

270.5

271.0

010155 2025303540

NDRV FREQUENCY vs. V

DD

MAX5014 toc13

VDD (V)

NDRV FREQUENCY (kHz)

V

OPTO

= 4V, CS = GND

47.0

47.2

47.1

47.4

47.3

47.6

47.5

47.7

47.9

47.8

48.0

010155 2025303540

MAX5015 MAXIMUM DUTY

CYCLE vs. V

DD

MAX5014 toc14

VDD (V)

MAXIMUM DUTY CYCLE (%)

V

OPTO

= 4V, CS = GND

DRIVER POWERED
FROM V+

DRIVER POWERED
FROM V

DD

9.5

9.6

9.8

9.7

10.0

10.1

9.9

10.2

010155 2025303540

VCC vs. V

DD

MAX5014 toc15

VDD (V)

V

CC

(V)

DEVICE POWERED FROM V

DD

DEVICE POWERED
FROM V+

1.31

1.33

1.32

1.36

1.35

1.34

1.39

1.38

1.37

1.40

04020 60 80 100

V+ SUPPLY CURRENT vs.

V+ VOLTAGE

MAX5014 toc16

V+ VOLTAGE (V)

V+ SUPPLY CURRENT (mA)

V

OPTO

= 4V, CS = GND, VDD = 0

0

6

4

2

8

10

12

0403010 20 50 60 70 80 90 110

V+ INPUT CURRENT vs. VOLTAGE

(AFTER STARTUP)

MAX5014 toc17

V+ VOLTAGE (V)

V+ INPUT CURRENT (µA)

100

V

OPTO

= 4V, CS = GND, VDD = 13V

9.0

9.4

9.2

9.8

9.6

10.2

10.0

10.4

VCC VOLTAGE vs. VCC CURRENT

MAX5014 toc18

VCC CURRENT (mA)

V

CC

VOLTAGE (V)

0 5.0 10.0 15.0 20.0

V+ = 110V, OPTO = CS = GND

VDD = 36V

VDD = 13V

9.0

9.3

9.2

9.1

9.4

9.5

9.6

9.7

9.8

9.9

10.0

0 5.0 10.0 15.0 20.0

VCC VOLTAGE vs. VCC CURRENT

MAX5014 toc19

VCC CURRENT (mA)

V

CC

VOLTAGE (V)

VDD = OPTO = CS = GND

V+ = 110V

V+ = 90V

V+ = 72V

V+ = 48V

V+ = 36V

V+ = 24V