Rainbow Electronics MAX5069 User Manual

General Description

The MAX5069 is a high-frequency, current-mode,
pulse-width modulation (PWM) controller (with dual
MOSFET drivers) that integrates all the building blocks
necessary for implementing AC-DC or DC-DC fixed-fre­quency power supplies. Isolated or nonisolated push­pull and half/full-bridge power supplies are easily
constructed using either primary- or secondary-side
regulation. Current-mode control with leading-edge
blanking simplifies control-loop design and a program­mable internal slope-compensation circuit stabilizes the
current loop when operating at duty cycles above 50%.

An input undervoltage lockout (UVLO) programs the
input-supply startup voltage and ensures proper opera­tion during brownout conditions.

A single external resistor programs the oscillator frequen­cy from 50kHz to 2.5MHz. The MAX5069A/D provide a
SYNC input for synchronization to an external clock. The
maximum FET-driver duty cycle for the MAX5069 is 50%.
Programmable dead time allows additional flexibility in
optimizing magnetic design and overcoming parasitic
effects. Programmable hiccup current limit provides
additional protection under severe faults.

The MAX5069 is specified over the -40°C to +125°C auto­motive temperature range and is available in a
16-pin thermally enhanced TSSOP-EP package. Refer to
the MAX5068 data sheet for single FET-driver applications.

Warning: The MAX5069 is designed to work with high
voltages. Exercise caution.

Applications

Universal-Input AC Power Supplies
Isolated Telecom Power Supplies
Networking System Power Supplies
Server Power Supplies
Industrial Power Conversion

Features

♦ Current-Mode Control with 47µA (typ) Startup

Current

♦ Oscillator Frequency Programmable to 2.5MHz
♦ Resistor-Programmable ±4.5% Accurate

Switching Frequency

♦ Dual Gate-Drive Output for Half/Full-Bridge or

Push-Pull Applications

♦ Rectified 85VAC to 265VAC, or 36VDC to 72VDC

Input (MAX5069A/B)

♦ Input Directly Driven from 10.8V to 24V

(MAX5069C/D)

♦ Programmable Dead Time and Slope

Compensation

♦ Programmable Startup Voltage (UVLO)
♦ Programmable UVLO Hysteresis (MAX5069B/C)
♦ Frequency Synchronization Input (MAX5069A/D)
♦ -40°C to +125°C Automotive Temperature Range
♦ 16-Pin Thermally Enhanced TSSOP-EP Package

MAX5069

High-Frequency, Current-Mode PWM Controller

with Accurate Oscillator and Dual FET Drivers

________________________________________________________________ Maxim Integrated Products 1

16

15

14

13

12

11

10

9

1

2

3

4

5

6

7

8

RT

REG5

IN

V

CC

NDRVA

NDRVB

PGND

AGND

CS

TOP VIEW

MAX5069

TSSOP-EP

SYNC(HYST*)

SCOMP

FB

DT

UVLO/EN

COMP

FLTINT

*MAX5069B/C.

Pin Configuration

Ordering Information

19-3175; Rev 0; 2/04

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.

*Future product—contact factory for availability.
**EP = Exposed pad.

PART TEMP RANGE PIN-PACKAGE

MAX5069AAUE*

16 TSSOP-EP**

MAX5069BAUE

16 TSSOP-EP**

MAX5069CAUE

16 TSSOP-EP**

MAX5069DAUE*

16 TSSOP-EP**

Selector Guide appears at end of data sheet.

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

-40°C to +125°C

MAX5069

High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

(V

IN

= +12V for the MAX5069C/D, VIN= +23.6V for the MAX5069A/B at startup, then reduces to +12V, CIN= C

REG5

= 0.1µF,

C

VCC

= 1µF, RRT= 100kΩ, NDRV_ = floating, TA= T

MIN

to T

MAX

, 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 PGND ............................................................-0.3V to +30V

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

V

CC

to PGND..........................................................-0.3V to +13V

V

CC

to AGND..........................................................-0.3V to +13V

FB, COMP, CS, HYST, SYNC, REG5 to AGND ........-0.3V to +6V

UVLO/EN, RT, DT, SCOMP, FLTINT to AGND .........-0.3V to +6V

NDRVA, NDRVB to PGND..........................-0.3V to (V

CC

+ 0.3V)

AGND to PGND.....................................................-0.3V to +0.3V

Continuous Power Dissipation (T

A

= +70°C)

16-Pin TSSOP-EP (derate 21.3mW/°C above +70°C)...1702mW

Operating Temperature Range..........................-40°C to +125°C

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

Storage Temperature Range .............................-60°C to +150°C

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

PARAMETER

CONDITIONS

UNITS

UNDERVOLTAGE LOCKOUT/STARTUP

Bootstrap UVLO Wake-Up Level

V

SUVR

VIN rising, MAX5069A/B

V

Bootstrap UVLO Shutdown Level

V

SUVF

VIN falling, MAX5069A/B

V

UVLO/EN Wake-Up Threshold V

ULR2

UVLO/EN rising

V

UVLO/EN Shutdown Threshold V

ULF2

UVLO/EN falling

V

HYST FET On-Resistance

MAX5069B/C only, sinking 50mA,
V

UVLO/EN

= 0V

Ω

HYST FET Leakage Current I

LEAK_H

V

UVLO/EN

= 2V, V

HYST

= 5V 3 nA

IN Supply Current In
Undervoltage Lockout

I

START

VIN = +19V, V

UVLO/EN

< V

ULF2

90 µA

IN Range V

IN

V

INTERNAL SUPPLIES (VCC and REG5)

VCC Regulator Set Point V

CCSP

V

REG5 Output Voltage V

REG5IREG5

= 0 to 1mA

V

REG5 Short-Circuit Current Limit

mA

f

SW

= 1.25MHz 7

IN Supply Current After Startup I

IN

VIN = +24V

f

SW

= 100kHz 3

mA

Shutdown Supply Current I

VIN_SD

90 µA

GATE DRIVER (NDRVA, NDRVB)

)

NDRVA/NDRVB sinking 100mA 2 4

Driver Output Impedance

)

NDRVA/NDRVB sourcing 25mA 3 6

Ω

Sinking

Driver Peak Output Current I

NDRV

Sourcing

mA

PWM COMPARATOR

Comparator Offset Voltage

V

COMP

> V

CS

V

Comparator Propagation Delay

VCS = 0.1V

ns

Minimum On-Time

)

Includes t

CS_BLANK

ns

CURRENT-LIMIT COMPARATOR

Current-Limit Trip Threshold V

CS

mV

SYMBOL

R

D S ( ON ) _H

I

REG5_SC

Z

OUT(LOW

Z

OUT(HIGH

V

OS_PWM

t

PD_PWM

t

ON(MIN

V

MIN TYP MAX

19.68 21.6 23.60

9.05 9.74 10.43

1.205 1.230 1.255

10.8 24.0

= + 10.8V to + 24V , V

IN

sour ci ng 1µA to 25m A 7.0 10.5

C C

4.85 5.00 5.15

1.30 1.60 2.00

298 314 330

1.18

10

47

18

1000

650

40

110

MAX5069

High-Frequency, Current-Mode PWM Controller

with Accurate Oscillator and Dual FET Drivers

_______________________________________________________________________________________ 3

PARAMETER

CONDITIONS

UNITS

CS Input Bias Current I

B_CL

VCS = 0V 0

µA

CS Blanking Time

ns

Propagation Delay from
Comparator Input to NDRV_

t

PD_CL

50mV overdrive

ns

IN CLAMP VOLTAGE

IN Clamp Voltage

IN sinking 2mA (Note 2)

V

ERROR AMPLIFIER (FB, COMP)

Voltage Gain A

V

R

COMP

= 100kΩ to AGND

dB

Unity-Gain Bandwidth BW

R

COMP

= 100kΩ to AGND,

C

LOAD

= 100pF to AGND

5

MHz

Phase Margin PM

R

COMP

= 100kΩ to AGND,

C

LOAD

= 100pF to AGND

D eg r ees

FB Input Offset Voltage V

OS_FB

3mV

High

COMP Clamp Voltage V

COMP

Low

V

Error-Amplifier Output Current I

COMP

Sinking or sourcing

mA

+25°C ≤ TA ≤ +125°C (Note 3)

Reference Voltage V

REF

-40°C ≤ TA ≤ +125°C (Note 3)

V

Input Bias Current I

B_EA

nA

COMP Short-Circuit Current

mA

THERMAL SHUTDOWN

Thermal-Shutdown Temperature

T

SD

°C

Thermal Hysteresis T

HYST

°C

OSCILLATOR SYNC INPUT (MAX5069A/D only)

SYNC High-Level Voltage

V

SYNC Low-Level Voltage

V

SYNC Input Bias Current

nA

Maximum SYNC Frequency f

SYNC

f

OSC

= 2.5MHz (Note 4)

MHz

SYNC High-Level Pulse Width

ns

SYNC Low-Level Pulse Width

ns

DIGITAL SOFT-START

Soft-Start Duration t

SS

(Note 5)

Cycles

Reference-Voltage Step V

STEP

mV

Reference-Voltage Steps During
Soft-Start

Steps

OSCILLATOR

Oscillator Frequency Range f

OSC

f

OSC

= (1011 / RRT)

kHz

ELECTRICAL CHARACTERISTICS (continued)

(V

IN

= +12V for the MAX5069C/D, VIN= +23.6V for the MAX5069A/B at startup, then reduces to +12V, CIN= C

REG5

= 0.1µF,

C

VCC

= 1µF, RRT= 100kΩ, NDRV_ = floating, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

SYMBOL

t

CS_BLANK

V

IN_CLAMP

I

COMP_SC

V
V

I

t

SYNC_HI

t

SYNC_LO

IH_SYNC

IL_SYNC

B_SYNC

MIN TYP MAX

24.0 26.0 29.0

2.6 3.8

0.4 1.1

0.5

1.215 1.230 1.245

1.205 1.230 1.242

2.4

3.125
30
30

50 2500

70

40

80

65

100 300

12

+170

25

10

2047

9.7

127

+2

0.4

MAX5069

High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers

4 _______________________________________________________________________________________

Note 1: The MAX5069 is 100% tested at TA= +25°C. All limits over temperature are guaranteed by design.
Note 2: The MAX5069A/B are intended for use in universal-input power supplies. The internal clamp circuit 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. The maximum current to V

IN

(hence to clamp) when UVLO is low (device is in shutdown) must be external­ly limited to 2mA. Clamp currents higher than 2mA may result in clamp voltages higher than 30V, thus exceeding the
absolute maximum rating for V

IN

. For the MAX5069C/D, do not exceed the 24V maximum operating voltage of the device.

Note 3: Reference voltage (V

REF

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

Note 4: The SYNC frequency must be at least 25% higher than the programmed oscillator frequency.
Note 5: The internal oscillator clock cycle.

PARAMETER

CONDITIONS

UNITS

NDRV_ Switching Frequency f

SW

fSW = 1011 / (2 x RRT)25

kHz

RT Voltage V

RT

40kΩ < R

RT

< 500kΩ 2.0 V

TA = +25°C

-4 +4

Oscillator Accuracy

T

A

= -40°C to +125°C

-6 +6

%

Maximum Duty Cycle D

MAX

DT connected to REG5

%

DEAD-TIME CONTROL (DT)

Dead Time t

DT

RDT = 24.9kΩ 60 ns

Dead-Time Disable Voltage

V

REG5

­V

Dead-Time Regulation Voltage V

DT

V

INTEGRATING FAULT PROTECTION (FLTINT)

FLTINT Source Current I

FLTINT

V

FLTINT

= 0V 60 µA

FLTINT Shutdown Threshold

V

FLTINT

rising 2.8 V

FLTINT Restart Threshold

V

FLTINT

falling 1.6 V

SLOPE COMPENSATION

Slope Compensation V

SLOPE

C

SLOPE

= 100pf, RT = 110kΩ 15

mV/µs

Slope-Compensation Range

090

mV/µs

Slope-Compensation Voltage
Range

V

SCOMP

0 2.7 V

ELECTRICAL CHARACTERISTICS (continued)

(V

IN

= +12V for the MAX5069C/D, VIN= +23.6V for the MAX5069A/B at startup, then reduces to +12V, CIN= C

REG5

= 0.1µF,

C

VCC

= 1µF, RRT= 100kΩ, NDRV_ = floating, TA= T

MIN

to T

MAX

, unless otherwise noted. Typical values are at TA= +25°C.) (Note 1)

SYMBOL

V

DT_DISABLE

V

FLTINT_SD

V

FLTINT_RS

MIN TYP MAX

f

≤ 500kHz -2.5 +2.5

OSC

f

> 500kHz

OSC

f

≤ 500kHz -4.5 +4.5

OSC

f

> 500kHz

OSC

100

0.5V

1.23

1250

V

SLOPER

MAX5069

High-Frequency, Current-Mode PWM Controller

with Accurate Oscillator and Dual FET Drivers

_______________________________________________________________________________________ 5

21.0

21.2

21.1

21.4

21.3

21.5

21.6

-40 35 60-15 10 85 110

BOOTSTRAP UVLO WAKE-UP LEVEL

vs. TEMPERATURE

MAX5069 toc01

TEMPERATURE (°C)

V

IN

(V)

MAX5069A/B

9.5

9.6

9.8

9.7

9.9

10.0

-40 35 60-15 10 85 110

BOOTSTRAP UVLO SHUTDOWN LEVEL

vs. TEMPERATURE

MAX5069 toc02

TEMPERATURE (°C)

V

IN

(V)

MAX5069A/B

1.220

1.225

1.235

1.230

1.240

1.245

-40 35 60-15 10 85 110

UVLO/EN WAKE-UP THRESHOLD

vs. TEMPERATURE

MAX5069 toc03

TEMPERATURE (°C)

UVLO/EN

(V)

UVLO/EN RISING

1.10

1.19

1.18

1.17

1.16

1.15

1.14

1.13

1.12

1.11

1.20

-40 35 60-15 10 85 110

UVLO/EN SHUTDOWN THRESHOLD

vs. TEMPERATURE

MAX5069 toc04

TEMPERATURE (°C)

UVLO/EN

(V)

UVLO/EN FALLING

40

44

52

48

56

60

-40 35 60-15 10 85 110

V

IN

SUPPLY CURRENT IN UNDERVOLTAGE

LOCKOUT vs. TEMPERATURE

MAX5069 toc05

TEMPERATURE (°C)

I

START

(µA)

V

IN

= 19V

WHEN IN BOOTSTRAP UVLO (MAX5069A/B)
UVLO/EN (MAX5069C/D) IS LOW

VIN SUPPLY CURRENT AFTER STARTUP

vs. TEMPERATURE

MAX5069 toc06

TEMPERATURE (°C)

I

IN

(mA)

85603510-15

3

2

4

6

5

7

8

1

-40 110

VIN = 24V

fSW = 1.25MHz

fSW = 50kHz

fSW = 500kHz

fSW = 100kHz

fSW = 250kHz

VCC vs. TEMPERATURE

MAX5069 toc07

TEMPERATURE (°C)

V

CC

(V)

85603510-15

7.6

7.3

8.2

7.9

8.8

8.5

9.4

9.1

9.7

10.0

7.0

-40 110

VIN = 19V, IIN = 25mA

VIN = 19V, IIN = 10mA

VIN = 10.8V, IIN = 10mA

VIN = 10.8V, IIN = 25mA

REG5 OUTPUT VOLTAGE

vs. OUTPUT CURRENT

MAX5069 toc08

OUTPUT CURRENT (mA)

REG5 (V)

1.81.61.41.21.00.80.60.40.2

4.955

4.960

4.965

4.970

4.975

4.980

4.950

02.0

RRT = 100kΩ

4.90

4.99

4.98

4.97

4.96

4.95

4.94

4.93

4.92

4.91

5.00

-40 35 60-15 10 85 110

REG5 vs. TEMPERATURE

MAX5069 toc09

TEMPERATURE (°C)

REG5 (V)

V

IN

= 10.8V

100µA LOAD

1mA LOAD

Typical Operating Characteristics

(VIN= +23.6V for MAX5069A/B at startup, then reduces to +12V, V

IN

= +12V for the MAX5069C/D, CIN= C

REG5

= 0.1µF, C

VCC

= 1µF,

RRT= 100kΩ, NDRV_ = floating, VFB= 0V, V

COMP

= floating, VCS= 0V, TA= +25°C, unless otherwise noted.)

MAX5069

High-Frequency, Current-Mode PWM Controller
with Accurate Oscillator and Dual FET Drivers

6 _______________________________________________________________________________________

Typical Operating Characteristics (continued)

(VIN= +23.6V for MAX5069A/B at startup, then reduces to +12V, V

IN

= +12V for the MAX5069C/D, CIN= C

REG5

= 0.1µF, C

VCC

= 1µF,

RRT= 100kΩ, NDRV_ = floating, VFB= 0V, V

COMP

= floating, VCS= 0V, TA= +25°C, unless otherwise noted.)

REG5 OUTPUT VOLTAGE vs. V

IN

MAX5069 toc10

VIN (V)

REG5 (V)

222016 18141210 24

4.976

4.977

4.978

4.979

4.980

4.981

4.982

4.983

4.984

4.985

4.975

I

REG5

= 100µA

CS TRIP THRESHOLD

vs. TEMPERATURE

MAX5069 toc11

TEMPERATURE (°C)

CS TRIP THRESHOLD (mV)

110

85603510-15

306
303

309

315
312

321
318

327
324

330

300

-40

SWITCHING FREQUENCY

vs. TEMPERATURE

MAX5069 toc12

TEMPERATURE (°C)

SWITCHING FREQUENCY (kHz)

110

856035-15

10

490
485

495

505
500

515
510

525
520

530

480

-40

fSW = 500kHz

TOTAL NUMBER OF
DEVICES = 200

MEAN

-3σ

+3σ

PROPAGATION DELAY FROM CS COMPARATOR

INPUT TO NDRV vs. TEMPERATURE

MAX5069 toc13

TEMPERATURE (°C)

PROPAGATION DELAY (ns)

1108535 6010-15

32

34

36

38

40

42

44

46

48

50

30

-40

INPUT CURRENT

vs. INPUT CLAMP VOLTAGE

MAX5069 toc14

INPUT CLAMP VOLTAGE (V)

INPUT CURRENT (mA)

27.525.022.520.017.515.012.5

2

4

6

8

10

12

14

0

10.0 30.0

INPUT CLAMP VOLTAGE

vs. TEMPERATURE

MAX5069 toc15

TEMPERATURE (°C)

INPUT CLAMP VOLTAGE (V)

1108535 6010-15

25.2

25.4

25.6

25.8

26.0

26.2

26.4

26.6

26.8

27.0

25.0

-40

I

SINK

= 2mA

1.0

2.8

2.6

2.4

2.2

2.0

1.8

1.6

1.4

1.2

3.0

-40 35 60-15 10 85 110

NDRVA/NDRVB OUTPUT IMPEDANCE

vs. TEMPERATURE

MAX5069 toc16

TEMPERATURE (°C)

R

ON

(Ω)

V

IN

= 24V

SINKING 100mA

2.0

3.8

3.6

3.4

3.2

3.0

2.8

2.6

2.4

2.2

4.0

-40 35 60-15 10 85 110

NDRVA/NDRVB OUTPUT IMPEDANCE

vs. TEMPERATURE

MAX5069 toc17

TEMPERATURE (°C)

R

ON

(Ω)

V

IN

= 24V

SOURCING 25mA

ERROR AMPLIFIER OPEN-LOOP GAIN

AND PHASE vs. FREQUENCY

MAX5069 toc18

FREQUENCY (Hz)

GAIN (dB)

PHASE (DEGREES)

10M10 100k1k

-20

0

20

40

60

80

100

120

-40

-180

-150

-120

-90

-60

-30

0

30

-210

0.1

GAIN

PHASE