ON Semiconductor NCP1030, NCP1031 Technical data

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NCP1030, NCP1031

Low Power PWM Controller with On−Chip Power Switch and Startup Circuits for 48V Telecom Systems

The NCP1030 and NCP1031 are a family of miniature high−voltage monolithic switching regulators with on−chip Power Switch and Startup Circuits. The NCP103x family incorporates in a single IC all the active power, control logic and protection circuitry required to implement, with minimal external components, several switching regulator applications, such as a secondary side bias supply or a low power dc−dc converter. This controller family is i deally s uited f or 4 8 V t elecom, 4 2 V a utomotive and 12 V input applications. The NCP103x can be configured in any single−ended topology such as forward or flyback. The NCP1030 is targeted for applications requiring up to 3 W, and the NCP1031 is targeted for applications requiring up to 6 W.

The internal error amplifier allows the NCP103x family to be easily configured for secondary or primary side regulation operation in isolated and non−isolated configurations. The fixed frequency o scillator is optimized for operation up to 1 MHz and is capable of external frequency synchronization, providing additional design flexibility. In addition, the NCP103x incorporates individual line undervoltage and overvoltage detectors, cycle by cycle current limit and thermal shutdown to protect the controller under fault conditions. The preset current limit thresholds eliminate the need for external sensing components.

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1030/N1031 = Specific Device Code A = Assembly Location L = Wafer Lot Y = Year W = Work Week

Micro8 DM SUFFIX CASE 846A

SO−8 D SUFFIX CASE 751

MARKING

DIAGRAMS

1030 AYW

N1031

ALYW

Features

• On Chip High 200 V Power Switch Circuit and Startup Circuit

• Internal Startup Regulator with Auxiliary Winding Override

• Operation up to 1 MHz

• External Frequency Synchronization Capability

• Frequency Fold−down Under Fault Conditions

• Trimmed ± 2% Internal Reference

• Line Undervoltage and Overvoltage Detectors

• Cycle by Cycle Current Limit Using SENSEFET

• Active LEB Circuit

• Overtemperature Protection

• Internal Error Amplifier

T ypical Applications

• Secondary Side Bias Supply for Isolated dc−dc Converters

• Stand Alone Low Power dc−dc Converter

• Low Power Bias Supply

• Low Power Boost Converter

PIN CONNECTIONS

GND

COMP

Device Package Shipping

NCP1030DMR2 Micro8 4000/Tape & Reel NCP1031DR2 SO−8

†For information on tape and reel specifications,

including part orientation and tape sizes, please refer to our Tape and Reel Packaging Specification Brochure, BRD8011/D.

(Top View)

ORDERING INFORMATION

DRAIN

†

2500/Tape & Reel

 Semiconductor Components Industries, LLC, 2004

August, 2004 − Rev. 4

1 Publication Order Number:

NCP1030/D

NCP1030, NCP1031

GND

VFB

COMP

Internal Bias

10 V

Error Amplifier

10 V

I2 = 3I

− +

2.5 V

−

2 k

Current Limit

Comparator

CT Ramp

3.0 V/3.5 V

One Shot

−

Pulse

− +

PWM Comparator

4.5 V

SENSE

LEB

− +

50 mV

−

Reset

Dominant

Latch

PWM Latch

7.5 V/10 V

Thermal

Shutdown

−

Reset

Dominant

Latch

− +

Disable

2.5 V

−

10 V

−

− +

−

10 V

6.5 V

−

START

16 V

DRAIN

Figure 1. NCP1030/31 Functional Block Diagram

FUNCTIONAL PIN DESCRIPTION

Pin Name Function Description

1 GND Ground Ground reference pin for the circuit. 2 C

3 V

4 COMP Error Amplifier Compensation Requires external compensation network between COMP and VFB pins. This pin is

5 OV Line Overvoltage Shutdown Line voltage (Vin) is scaled down using an external resistor divider such that the OV

6 UV Line Undervoltage Shutdown Line voltage is scaled down using an external resistor divider such that the UV

7 V

8 V

DRAIN

Oscillator Frequency

Selection

An external capacitor connected to this pin sets the oscillator frequency up to 1 MHz. The oscillator can be synchronized to a higher frequency by charging or discharging C

to trip the internal 3.0 V/3.5 V comparator. If a fault condition exists, the power

switch is disabled and the frequency is reduced by a factor of 7.

Feedback Input The regulated voltage is scaled down to 2.5 V by means of a resistor divider.

Regulation is achieved by comparing the scaled voltage to an internal 2.5 V reference.

effectively grounded if faults are present.

voltage reaches 2.5 V when line voltage reaches its maximum operating voltage.

voltage reaches 2.5 V when line voltage reaches its minimum operating voltage.

Supply Voltage This pin is connected to an external capacitor for energy storage. During Turn−On, the

startup circuit sources current to charge the capacitor connected to this pin. When the

, the startup circuit turns OFF and the power switch is

CC(on)

should not exceed 16 V.

should not exceed 200 V.

DRAIN

Power Switch and

Startup Circuits

supply voltage reaches V enabled if no faults are present. An external winding is used to supply power after initial startup to reduce power dissipation. V

This pin directly connects the Power Switch and Startup Circuits to one of the transformer windings. The internal High Voltage Power Switch Circuit is connected between this pin and ground. V

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NCP1030, NCP1031

CT Ramp

Charge

Signal

PWM

Comparator

Output

PWM Latch

Output

Power Switch

Circuit Gate Drive

Leading Edge

Blanking Output

COMP Voltage

Current Limit Propagation Delay

Current Limit Threshold

Normal PWM Operating Range Output Overload

Figure 2. Pulse Width Modulation Timing Diagram

CC(on)

CC(off)

CC(reset)

START

0 mA

3.0 V

2.5 V

DRAIN

0 V

Power−up &

Normal Operation

Output Overload

standby Operation

Figure 3. Auxiliary Winding Operation with Output Overload Timing Diagram

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NCP1030, NCP1031

MAXIMUM RATINGS

Rating Symbol Value Unit

Power Switch and Startup Circuits Voltage V Power Switch and Startup Circuits Input Current

− NCP1030

DRAIN

− NCP1031 VCC Voltage Range V All Other Inputs/Outputs Voltage Range V VCC and All Other Inputs/Outputs Current I Operating Junction Temperature T Storage Temperature T

stg

Power Dissipation (TJ = 25°C, 2.0 Oz., 1.0 Sq Inch Printed Circuit Copper Clad)

DM Suffix, Plastic Package Case 846A D Suffix, Plastic Package Case 751

Thermal Resistance, Junction to Air (2.0 Oz. Printed Circuit Copper Clad)

DM Suffix, Plastic Package Case 846A



0.36 Sq. Inch

1.0 Sq. Inch

D Suffix, Plastic Package Case 751

0.36 Sq. Inch

1.0 Sq. Inch

Maximum ratings are those values beyond which device damage can occur. Maximum ratings applied to the device are individual stress limit values (not normal operating conditions) and are not valid simultaneously . If these limits are exceeded, device functional operation is not implied, damage may occur and reliability may be affected.

A.This device contains ESD protection circuitry and exceeds the following tests:

Pins 1−7: Human Body Model 2000V per MIL−STD−883, Method 3015.

Pins 1−7: Machine Model Method 200 V.

Pin 8 is connected to t he H igh Voltage Startup and Power Switch Circuits a nd rated only to the maximum voltage rating o f t he p art, or 2 00V.

B.This device contains Latchup protection and exceeds 100 mA per JEDEC Standard JESD78.

−0.3 to 200 V A

1.0

2.0

−0.3 to 16 V

−0.3 to 10 V 100 mA

−40 to 125 °C

−55 to 150 °C W

0.69

0.93 °C/W

181 162

135 117

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NCP1030, NCP1031

DC ELECTRICAL CHARACTERISTICS (V

= 2.5 V, TJ = −40°C to 125°C, typical values shown are for TJ = 25°C unless otherwise noted.) (Note 1)

COMP

Characteristics

= 48 V, VCC = 12 V, CT = 560 pF, VUV = 3 V, VOV = 2 V, VFB = 2.3 V,

DRAIN

Symbol Min Typ Max Unit

STARTUP CONTROL

Startup Circuit Output Current (VFB = V

NCP1030

= 25°C

= −40°C to 125°C

= 0 V

= V

= 0 V

= V

CC(on)

− 0.2 V

COMP

)

START

6.0

8.0

2.0

12.5

8.6

−

15 12

16 13

NCP1031

= 25°C

= 0 V

= V

= −40°C to 125°C

= 0 V

= V

CC(on)

− 0.2 V

8.0 11

4.0

16 12

19 16

−

21 18

VCC Supply Monitor (VFB = 2.7 V)

Startup Threshold Voltage (V Minimum Operating V Hysteresis Voltage

Undervoltage Lockout Threshold Voltage, VCC Decreasing (VFB = V Minimum Startup Voltage (Pin 8)

= 0.5 mA, VCC =V

START

Increasing)

After Turn−on (VCC Increasing)

− 0.2 V

CC(on)

COMP

) V

CC(on)

CC(off)

CC(hys)

CC(reset)

START(min)

9.6

7.0

10.2

7.6

−

2.6

10.6

8.0

−

6.0 6.6 7.0 V

− 16.8 18.5

ERROR AMPLIFIER

Reference Voltage (V

TJ = 25°C T

= −40°C to 125°C

Line Regulation (VCC = 8 V to 16 V, TJ = 25°C) REG Input Bias Current (VFB = 2.3 V) I COMP Source Current I COMP Sink Current (VFB = 2.7 V) I COMP Maximum Voltage (I COMP Minimum Voltage (I Open Loop Voltage Gain A

= VFB, Follower Mode)

COMP

= 0 A) V

SRC

= 0 A, VFB = 2.7 V) V

SNK

REF

LINE VFB SRC SNK

C(max)

C(min)

VOL

2.45

2.40

2.5

2.55

2.60

− 1.0 5.0 mV

− 0.1 1.0 A

80 110 140 A

200 550 900 A

4.5 − − V

− − 1.0 V

− 80 − dB

Gain Bandwidth Product GBW − 1.0 − MHz

LINE UNDER/OVERVOLTAGE DETECTOR

Undervoltage Lockout (V

Voltage Threshold (Vin Increasing)

= V

Voltage Hysteresis Input Bias Current

Overvoltage Lockout (VFB = V

Voltage Threshold (Vin Increasing) Voltage Hysteresis Input Bias Current

COMP

)

UV(hys)

2.400

0.075

−

2.550

0.175 0

2.700

0.275

1.0

)

OV(hys)

2.400

0.075

−

2.550

0.175 0

2.700

0.275

1.0

1. Production testing for NCP1030DMR2 is performed at 25°C only; limits at −40°C and 125°C are guaranteed by design.

V V

A

V V

A

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NCP1030, NCP1031

DC ELECTRICAL CHARACTERISTICS (V

= 2.5 V, TJ = −40°C to 125°C, typical values shown are for TJ = 25°C unless otherwise noted.) (Note 2)

COMP

Characteristics

= 48 V, VCC = 12 V, CT = 560 pF, VUV = 3 V, VOV = 2 V, VFB = 2.3 V,

DRAIN

Symbol Min Typ Max Unit

OSCILLATOR

Frequency (CT = 560 pF, Note 3)

TJ = 25°C T

= −40°C to 125°C

Frequency (CT = 100 pF) f Charge Current (VCT = 3.25 V) I Discharge Current (VCT = 3.25 V) I

OSC1

OSC2 CT(C) − CT(D) −

275 260

300

−

− 800 − kHz 215 − A 645 − A

Oscillator Ramp

Peak Valley

Vrpk V

rvly

−

3.5

3.0

PWM COMPARATOR

Maximum Duty Cycle

MAX

70 75 80 %

POWER SWITCH CIRCUIT

Power Switch Circuit On−State Resistance (I NCP1030

= 25°C

= 125°C

NCP1031

= 25°C

= 125°C

Power Switch Circuit and Startup Circuit Breakdown Voltage

(ID = 100 A, TJ = 25°C)

Power Switch Circuit and Startup Circuit Off−State Leakage Current (V

= 200 V, VUV = 2.0 V)

DRAIN

= 25°C

= −40 to 125°C

= 100 mA)

DS(on)

(BR)DS

DS(off)

−

4.1

6.0

2.1

3.5

200 − −

−

Switching Characteristics (VDS = 48 V, RL = 100 )

Rise Time Fall Time

−

22 24

CURRENT LIMIT AND OVER TEMPERATURE PROTECTION

Current Limit Threshold (T

NCP1030 (di/dt = 0.5 A/s)

= 25°C)

NCP1031 (di/dt = 1.0 A/s)

Propagation Delay, Current Limit Threshold to Power Switch Circuit Output

(Leading Edge Blanking plus Current Limit Delay)

LIM

PLH

350 700

515

1050

− 100 −

Thermal Protection (Note 4)

Shutdown Threshold (TJ Increasing) Hysteresis

SHDN

HYS

125

−

150

TOTAL DEVICE

Supply Current After UV Turn−On

Power Switch Enabled Power Switch Disabled

Non−Fault condition (V Fault Condition (V

= 2.7 V, V

= 2.7 V)

= 2.0 V)

I I

CC1

CC2 CC3

2.0

−

3.0

1.5

0.65

2. Production testing for NCP1030DMR2 is performed at 25°C only; limits at −40°C and 125°C are guaranteed by design.

3. Oscillator frequency can be externally synchronized to the maximum frequency of the device.

4. Guaranteed by design only.

325

kHz

325

−



7.0 12

3.0

6.0

A

25 50

−

680

1360

°C

−

4.0

2.0

1.2

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