ON Semiconductor NCP1337 Technical data

NCP1337

PWM Current−Mode Controller for Free Running Quasi−Resonant Operation

The NCP1337 combines a true current mode modulator and a demagnetization detector which ensures full Borderline/Critical Conduction Mode in any load/line conditions together with minimum drain voltage switching (Quasi−Resonant operation). The transformer core reset detection is done internally, without using any external signal, due to the Soxyless concept. The frequency is internally limited to 130 kHz, preventing the controller to operate above the 150 kHz CISPR−22 EMI starting limit.

By monitoring the feedback pin activity, the controller enters ripple mode as soon as the power demand falls below a predetermined level. As each restart is softened by an internal soft−start, and as the frequency cannot go below 25 kHz, no audible noise can be heard.

The NCP1337 also features an efficient protective circuitry which, in presence of an overcurrent condition, disables the output pulses and enters a safe burst mode, trying to restart. Once the default has gone, the device auto−recovers. Also included is a bulk voltage monitoring function (known as brown−out protection), an adjustable overpower compensation, and a VCC OVP. Finally, an internal 4.0 ms soft−start eliminates the traditional startup stress.

Features

• Free−Running Borderline/Critical Mode Quasi−Resonant Operation

• Current−Mode

• Soft Ripple Mode with Minimum Switching Frequency for Standby

• Auto−Recovery Short−Circuit Protection Independent of Auxiliary

Voltage

• Overvoltage Protection

• Brown−Out Protection

• Two Externally Triggerable Fault Comparators (one for a disable

function, and the other for a permanent latch)

• Internal 4.0 ms Soft−Start

• 500 mA Peak Current Drive Sink Capability

• 130 kHz Max Frequency

• Internal Leading Edge Blanking

• Internal Temperature Shutdown

• Direct Optocoupler Connection

• Dynamic Self−Supply with Levels of 12 V (On) and 10 V (Off)

• SPICE Models Available for TRANsient and AC Analysis

• These are Pb−Free Devices*

T ypical Applications

• AC−DC Adapters for Notebooks, etc.

• Offline Battery Chargers

• Consumer Electronics (DVD Players, Set−Top Boxes, TVs, etc.)

• Auxiliary Power Supplies (USB, Appliances, TVs, etc.)

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MARKING DIAGRAM

PDIP−7

P SUFFIX

CASE 626B

SOIC−7

D SUFFIX

CASE 751U

A = Assembly Location WL = Wafer Lot Y, YY = Y ear WW = Work Week G = Pb−Free Package G = Pb−Free Package

PIN CONNECTIONS

GND DRV

(Top V iew)

ORDERING INFORMATION

Device Package Shipping†

NCP1337PG PDIP−7

(Pb−Free)

NCP1337DR2G SOIC−7

(Pb−Free)

†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.

NCP1337P AWL

YYWWG

P1337

AYWW

VCC

50 Units/Tube

2500 Tape & Ree

July, 2006 − Rev . 2

*For additional information on our Pb−Free strategy

and soldering details, please download the ON Semiconductor Soldering and Mounting Techniques Reference Manual, SOLDERRM/D.

1 Publication Order Number:

NCP1337/D

NCP1337

PIN FUNCTION DESCRIPTION

Pin No. Symbol Function Description

1 BO Brown−out and external

triggering

• By connecting this pin to the input voltage through a resistor divider, the

controller ensures operation at a safe mains level.

• If an external event brings this pin above 3.0 V, the controller’s output is

disabled.

• If an external event brings this pin above 5.0 V, the controller is

permanently latched−off.

2 FB Sets the peak current

setpoint

• By connecting an optocoupler or an auxiliary winding to this pin, the peak

current setpoint is adjusted accordingly to the output power demand.

• When the requested peak current setpoint is below the internal standby

level, the device enters soft ripple mode.

3 CS Current sense input and

overpower compensation adjustment

4 GND IC ground 5 DRV Output driver

6 VCC IC supply

8 HV High−voltage pin

• This pin senses the primary current and routes it to the internal comparator

via an L.E.B.

• Inserting a resistor in series with the pin allows to control the overpower

compensation level.

• To be connected to an external MOSFET.

• Connected to a tank capacitor (and possibly an auxiliary winding).

• When V

reaches 18.6 V , an internal OVP stops the output pulses.

• Connected to the high−voltage rail, this pin injects a constant current into

the VCC bulk capacitor and ensures a clean lossless startup sequence.

OUT

bulk

NCP1337

1 8 2 3 4

6 5

Rcomp

Figure 1. Typical Application Schematic

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NCP1337

GND

5 V

500 mV

3 V

Ton

4 k

Vdd

−

3 V

−

100 mV 130 mV

20 kHz

Low−pass

filter

Vdd

activated

70 mA x VBO − 35 mA

2 p

−

10 mA

500 mV

FAULT

if Zener

350 ns

LEB

DISABLE

Vdd

BOK

OVP

Skip

−

Setpoint

SSkip

PERM. LATCH

Vdd

VCC < 4 V

TSD

Startup

Ton

Soxyless

Ton

SStart

67 ms

max Ton

−

CS comp.

300 ms

Soft−Skipt

4 ms

soft−start

PERM. LATCH

SSkip

SStart

(*If FAULT duration > 80 ms = > STOP Restart when 2nd time VCC = VCCon)

timeout

TSD

7.5 ms min period

Management*

FAULT

8 ms

TSD

FAULT

35 ms

max Toff

Toff

Clk

Ton

Q Q

Toff

12 V 10 V

5 V

OVP

5.5 ms

blanking

Inhib

Soxyless

demag

detection

Soxyless

−

9.5 mA or 600 mA

−

18.6 V

Figure 2. Internal Circuit Architecture

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NCP1337

MAXIMUM RATINGS

Rating Symbol Value Unit

Voltage on Pin 8 (HV) when Pin 6 (VCC) is Decoupled to Ground with 10 mF V

Maximum Current in Pin 8 (HV) − 20 mA Power Supply Voltage, Pin 6 (VCC) and Pin 5 (DRV) V

CCmax

Maximum Current in Pin 6 (VCC) − "30 mA Maximum Voltage on all Pins except Pin 8 (HV), Pin 6 (VCC) and Pin 5 (DRV) − −0.3 to 10 V Maximum Current into all Pins except Pin 8 (HV), Pin 6 (VCC) and Pin 5 (DRV) − "10 mA Maximum Current into Pin 6 (DRV) during ON Time and T Maximum Current into Pin 6 (DRV) after T

during OFF Time − "15 mA

BLANK

Thermal Resistance, Junction−to−Case R Thermal Resistance, Junction−to−Air, SOIC Version R Thermal Resistance, Junction−to−Air, DIP Version R Maximum Junction Temperature TJ

− "1.0 A

MAX

Operating Temperature Range − −40 to +125 °C Storage Temperature Range − −60 to +150 °C ESD Capability, HBM Model per Mil−std−883, Method 3015 (All Pins except HV) − 2.0 kV ESD Capability, Machine Model − 200 V

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.

1. This device contains latchup protection and exceeds 100 mA per JEDEC standard JESD78.

−0.3 to 500 V

−0.3 to 20 V

57 °C/W 178 °C/W 100 °C/W 150 °C

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NCP1337

ELECTRICAL CHARACTERISTICS (For typical values T

= 25°C, for min/max values TJ = 0°C to +125°C, Max TJ = 150°C,

VCC = 11 V, unless otherwise noted.)

Characteristic Pin Symbol Min Typ Max Unit

SUPPLY SECTION

VCC Increasing Level at which the Controller Starts 6 VCC VCC Decreasing Level at which the Controller Stops 6 VCC Protection Mode is Activated if VCC reaches this Level whereas the HV

6 VCC

ON MIN OFF

11 12 13 V

9.0 10 11 V

− 9.0 − V

Current Source is ON VCC Decreasing Level at which the Latch−Off Phase Ends 6 VCC Margin between VCC Level at which Latch Fault is Released and

VCC

LATCH

− V

MARGIN

VCC Increasing Level at which the Controller Enters Protection Mode 6 VCC VCC Level below which HV Current Source is Reduced 6 VCC Internal IC Consumption, No Output Load on Pin 5, F Internal IC Consumption, 1.0 nF Output Load on Pin 5, F

= 60 kHz 6 ICC1 − 1.2 − mA

= 60 kHz 6 ICC2 − 2.0 − mA

LATCH

OVP

INHIB

3.6 5.0 6.0 V

0.3 − − V

17.6 18.6 19.6 V

− 1.5 − V

Internal IC Consumption, Latch−Off Phase, VCC = 8.0 V 6 ICC3 − 600 − mA Internal IC Consumption in Skip 6 ICC

LOW

− 600 − mA

INTERNAL STARTUP CURRENT SOURCE

Minimum Guaranteed Startup Voltage on HV Pin 8 V High−Voltage Current Source when VCC > VCC

INHIB

8 IC1 5.5 9.5 15 mA

HVmin

− − 55 V

(VCC = 10.5 V , VHV = 60 V) High−Voltage Current Source when VCC < VCC

INHIB

8 IC2 0.3 0.6 1.1 mA

(VCC = 0 V , VHV = 60 V) Leakage Current Flowing when the HV Current Source is OFF

8 I

HVLeak

− − 90 mA

(VCC = 17 V , VHV = 500 V)

DRIVE OUTPUT

Output Voltage Rise−T ime @ CL = 1.0 nF, 10−90% of Output Signal 5 T Output Voltage Fall−T ime @ CL = 1.0 nF, 10−90% of Output Signal 5 T Source Resistance 5 R Sink Resistance 5 R

F OH OL

− 50 − ns

− 20 − ns

− 20 − W

− 8.0 − W

TEMPERATURE SHUTDOWN

Temperature Shutdown − TSD 130 − − °C Hysteresis on Temperature Shutdown − − − 30 − °C

CURRENT COMPARATOR

Maximum Internal Current Setpoint (@ I

Minimum Internal Current Setpoint (@ I

Internal Current Setpoint for IFB = I

Propagation Delay from Current Detection to Gate OFF State 3 T

Leading Edge Blanking Duration 3 T

Internal Current Offset Injected on the CS Pin during ON Time

= I

FBrippleOUT

) 3 V

FB100%

) 3 V

FBrippleIN

3 V

CSrippleOUT

3 I

CSLimit

CSrippleIN

DEL

LEB

OPC

475 500 525 mV

− 100 − mV

− 130 − mV

− 120 150 ns

− 350 − ns

(Over Power Compensation)

@ 1.0 V on Pin 1 and Vpin3 = 0.5 V @ 2.0 V on Pin 1 and Vpin3 = 0.5 V

Maximum ON Time 5 MaxT

−

105

−

52 67 82 ms

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