MOTOROLA NCP1560HDR2 Datasheet

NCP1560

Full Featured Voltage Mode PWM Controller

The NCP1560 PWM controller contains all the features and flexibility needed to implement voltage-mode control in high performance single ended DC/DC converters. This device cost effectively reduces system part count with the inclusion of a high voltage start-up regulator that operates over a wide input range of

21.5 V to 150 V. The NCP1560 provides two control outputs, OUT1 which controls the main PWM switch and OUT2 with adjustable over-lap delay, which can control a synchronous rectifier switch or an active clamp/reset switch. Other distinctive features include: two mode over current protection, line under/over voltage lockout, fast line feedforward, soft start and a maximum duty cycle limit.

Features

• Minimum Operating Voltage of 21.5 V

• Internal High Voltage Start-up Regulator

• Dual Control Outputs with Adjustable Overlap Delay

• Single Resistor Oscillator Frequency Setting

• Fast Line Feedforward

• Line Under/Over Voltage Lockout

• Dual Mode Over Current Protection

• Programmable Maximum Duty Cycle Control

• Maximum Duty Cycle Proportional to Line Voltage

• Programmable Soft Start

• Precision 5.0 V Reference

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MARKING DIAGRAM

16

SO-16

16

1

ORDERING INFORMATION

Device Package Shipping

NCP1560HDR2 SO-16 2500/Tape & Reel

D SUFFIX

CASE 751B

NCP1560 = Device Code A = Assembly Location WL = Wafer Lot Y = Year WW = Work Week

NCP1560

AWLYWW

1

T ypical Applications

• Telecommunication Power Converters

• Industrial Power Converters

• High Voltage Power Modules

• +42 V Automotive Systems

• Control Driven Synchronous Rectifier Power Converters

 Semiconductor Components Industries, LLC, 2003

January, 2003 - Rev. 5

1 Publication Order Number

NCP1560/D

NCP1560

UV/OV

CSKIP

DC

MAX

V

CS

R

FF

High Voltage

in

Start-up

Regulator

5.0 V

Reference

UV

Fault

Detection

T

Modulator

Delay

Logic

Output Drivers

Oscillator

V

AUX

V

REF

OUT1

OUT2

t

D

V

EA

SS

GND

Figure 1. Simplified Block Diagram

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2

V

in

V

in

V

AUX

C

AUX

GND

UV/OV

CSKIP

C

CSKIP

CS

C

SS

R

T

R

FF

V

16

14

2

5

SS

R

FF

1

6

9

4

in

7

T

1.49 V

11 A

V

+

1.3 V*

-

I

FF

13.8 mA

+

11 V/7 V

-

+

-

+

3.6 V

-

V

REF

Disable

One Shot

Pulse

(600 ns)

+

-

+

0.6 V

-

+

0.5 V

-

REF

Disable_ss

STOP

* Trimmed during manufacturing to obtain

1.3 V with RT = 101 k

5.3 k

6.7 k

NCP1560

Disable

One Shot

Pulse

(250 ns)

Disable_V

REF

S

Monotonic

Dominant)

Start

Latch

(Reset

Q

R

+

STOP

Disable_ss

-

+

Clock

-

+ + 2 V

-

+

-

Soft Start

Comparator

S

Output

Latch

(Reset

Dominant)

R

Q

Delay

Logic

CURRENT MIRROR

Oscillator Ramp

I

2 V

1

2

10 pF

One Shot

Pulse

FF Ramp (Adjustable)

+

2 V

+

-

I

1

+

-

Clock

V

I 

125 k

+ + V

-

10 pF

C

FF

V

AUX

5.0 V Reference DIS

Disable_V

V

AUX

Comparator

+

-

20 k

Max DC

+

Comparator

-

2 V

+

V

DC(inv)

-

REF

V

AUX

DIS

PWM

40 k

32 k

27 k

DIS

2 k

10

V

12 t

15

13

11

D

V

REF

R

OUT2

V

REF

8

D

OUT1

EA

R

MDP

DC

MAX

R

P

Figure 2. NCP1560 Functional Block Diagram

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NCP1560

PIN DESCRIPTION

Pin Name Application Information

1 V

in

2 UV/OV Input supply voltage is scaled down and sampled by means of a resistor divider. The supply voltage must

3 NC Not Connected. 4 FF An external resistor between Vin and this pin adjusts the amplitude of the FF Ramp in proportion to Vin. By

5 CS Over current sense input. If the CS voltage exceeds 0.48 V or 0.57 V, the converter enters the Cycle by

This pin is connected to the bulk DC input voltage supply. A constant current source supplies current from this pin to the capacitor connected on the V range is 21.5 V to 150 V.

pin. The charge current is typically 13.8 mA. Input voltage

AUX

be scaled down between 1.52 V and 3.61 V within the specified input voltage range.

varying the feedforward ramp amplitude in proportion to the input voltage, changes in loop bandwidth are eliminated.

Cycle or Cycle Skip current limit mode, respectively.

6 CSKIP The capacitor connected between this pin and ground sets the Cycle Skip period. A soft start sequence

follows at the conclusion of the fault period. 7 R 8 DC

T

MAX

A single external resistor between this pin and GND sets the oscillator fixed frequency.

An external resistor between this pin and GND sets the voltage on the Max DC Comparator inverting in-

put. The duty cycle is limited by comparing the voltage on the Max DC Comparator inverting input to the

Feedforward Ramp. 9 SS An internal 6.2 A current source charges the external capacitor connected to this pin. The duty cycle is

limited during start-up by comparing the voltage on this pin to the Oscillator Ramp.

10 V

EA

The error signal from an external error amplifier is fed into this input and compared to the Feedforward

Ramp. A series diode and resistor offset the voltage on this pin before it is applied to the PWM Compara-

tor inverting input.

11 V 12 t

REF

D

Precision 5.0 V reference output. Maximum output current is 6 mA.

An external resistor between V

tions.

and this pin sets the overlap delay between OUT1 and OUT2 transi-

REF

13 OUT2 Output of the PWM controller with leading and trailing edge overlap delay. OUT2 can be used to drive a

synchronous rectifier topology, an active clamp/reset switch, or both.

14 GND Control circuit ground. 15 OUT1 Main output of the PWM controller. 16 V

AUX

Positive input supply voltage. This pin is connected to an external capacitor for energy storage. An inter-

nal current supplies current from Vin to this pin. Once the voltage on V

source turns OFF. It turns ON again once V

the IC via this pin, by means of an auxiliary winding.

falls to 7 V. During normal operation, power is supplied to

AUX

reaches 11 V, the current

AUX

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NCP1560

MAXIMUM RATINGS (Note 1)

Rating

Input Line Voltage V Auxiliary Supply Voltage V Auxiliary Supply Input Current I OUT1 and OUT2 Voltage V OUT1 and OUT2 Output Current I

5.0 V Reference Voltage V

5.0 V Reference Output Current I All Other Inputs/Outputs Voltage V All Other Inputs/Outputs Current I Operating Junction Temperature T Storage Temperature Range T Power Dissipation at TA = 25°C P Thermal Resistance, Junction to Ambient R

1. Maximum Ratings are those values beyond which damage to the device may occur. Exposure to these conditions or conditions beyond those indicated may adversely affect device reliability. Functional operation under absolute maximum-rated conditions is not implied. Functional operation should be restricted to the Recommended Operating Conditions. A.This device series contains ESD protection and exceeds the following tests:

Pin 1 is the HV start-up of the device and is rated to the max rating of the part, or 150 V.

Machine Model Method 150 V.

Pins 2-16: Human Body Model 4000 V per MIL-STD-883, Method 3015.

Machine Model Method 200 V.

Symbol Value Unit

in

AUX

OUT

REF

IO

stg

D



J

JA

-0.3 to 150 V

-0.3 to 16 V 35 mA

-0.3 to (V

+ 0.3 V) V

AUX

10 mA

-0.3 to 6.0 V

6.0 mA

-0.3 to V

REF

10 mA

-40 to 125 °C

-55 to 150 °C

0.77 W 130 °C/W

V

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NCP1560

ELECTRICAL CHARACTERISTICS (V

R

= 60.4 k, RFF = 432 k, for typical values TJ = 25°C, for min/max values, TJ = -40°C to 125°C, unless otherwise noted)

D

Characteristic

START-UP CONTROL AND V

Regulation

V

AUX

Start-up Threshold/V Minimum Operating V Hysteresis

AUX

Minimum Start-up Voltage (Pin 1) I

START

= 1.0 mA, V

AUX

= V

Start-up Circuit Output Current

V

= 0 V

AUX

T

= 25°C

J

T

= -40°C to 125°C

J

= V

V

AUX

TJ = 25°C T

= -40°C to 125°C

J

AUX(on)

- 0.2 V

Start-up Circuit Off-State Leakage Current (Vin = 150 V)

TJ = 25°C T

= -40°C to 125°C

J

Start-up Circuit Breakdown Voltage (Note 2)

I

START(off)

= 50A, TJ = 25°C

Auxiliary Supply Current After V

Outputs Disabled

V

= 0 V

EA

= 0.7 V

V

UV/OV

Outputs Enabled

REGULATOR

AUX

Regulation Peak (V

Valley Voltage After Turn-On

- 0.2 V

AUX(on)

Turn-On

AUX

= 48 V, V

in

AUX

= 12 V, VEA = 2 V, RT = 101 k, C

AUX

Symbol Min Typ Max Unit

increasing)

V V

V

START(min)

I

START(off)

AUX(on) AUX(off)

V

I

START

V

(BR)DS

I

AUX1

I

AUX2

I

AUX3

= 6800 pF,

CSKIP

10.5

6.6

H

-

11.0

7.0

4.0

- 19.3 21.5

13 10

10

8

-

17.5

-

13.8

-

23

-

150 - - V

-

2.7

1.3

4.6

LINE UNDER/OVERVOLTAGE DETECTOR

Undervoltage Threshold (V

Increasing) V

in

Undervoltage Hysteresis V Overvoltage Threshold (Vin Increasing) V Overvoltage Hysteresis V

Undervoltage Propagation Delay to Output t Overvoltage Propagation Delay to Output t

UV

UV(H)

OV

OV(H)

UV

OV

1.40 1.52 1.64 V

0.080 0.098 0.120 V

3.47 3.61 3.75 V

- 0.145 - V

- 250 - ns

- 160 - ns

CURRENT LIMIT

Cycle by Cycle Threshold Voltage Propagation Delay to Output (VEA = 2.0 V)

VCS = I

to 2.0 V, measured when V

LIM1

reaches 0.5 V

OUT

OH

Cycle Skip Threshold Voltage I Cycle Skip Charge Current (V

= 0 V) I

CSKIP

I

LIM1

t

ILIM

LIM2

CSKIP

0.44 0.48 0.52 V

- 90 150 ns

0.54 0.57 0.62 V

8.0 12.3 15 A

2. Guaranteed by design only.

11.5

V

7.4

V

mA

21 25

17 19

A

50

100

mA

5.0

2.5

6.5

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