MOTOROLA MC44605P Datasheet

MC44605

Product Preview

High Safety, Latched Mode, GreenLine



PWM Controller for (Multi)Synchronized Applications

The MC44605 is a high performance current mode controller that is specifically designed for off–line converters. This circuit has several distinguishing features that make it particularly suitable for multisynchronized monitor applications.

The MC44605 synchronization arrangement enables operation from 16 kHz up to 130 kHz. This product was optimized to operate with universal mains voltage, i.e., from 80 V to 280 V, and its high current totem pole output makes it ideally suited for driving a power MOSFET.

The MC44605 protections enable a well–controlled and safe power management. Four major faults while detected, activate the analogic counter of a disabling block designed to perform a latched circuit output inhibition.

Current Mode Controller

• Current Mode Operation up to 250 kHz Output Switching Frequency

• Inherent Feed Forward Compensation

• Latching PWM for Cycle–by–Cycle Current Limiting

• Oscillator with Precise Frequency Control

• Externally Programmable Reference Current

• Secondary or Primary Sensing (Availability of Error Amplifier Output)

• Synchronization Facility

• High Current Totem Pole Output

• V

Undervoltage Lockout with Hysteresis

• Low Output dV/dT for Low EMI Radiations

• Low Start–Up and Operating Current

Safety/Protection Features

• Soft–Start Feature

• Demagnetization (Zero Current Detection) Protection

• Overvoltage Protection Facility against Open Loop

• EHT Overvoltage Protection (E.H.T.OVP): Detection of too High

Synchronization Pulses

• Winding Short Circuit Detection (W.S.C.D.)

• Limitation of the Maximum Input Power (M.P.L.): Calculation of

Input Power for Overload Protection

• Overheating Detection (O.H.D.): to Prevent the Power Switch from

an Excessive Heating

Latched Disabling Mode

• When one of the following faults is detected: EHT overvoltage,

Winding Short Circuit (WSCD), a too high input power (M.P.L.), power switch overheating (O.H.D.), an analogic counter is activated

• If the counter is activated for a time that is long enough, the circuit

gets definitively disabled. The latch can only be reset by making decrease the Vcc down to about 3 V, i.e., practically by unplugging or turning off the SMPS.

This document contains information on a product under development. ON Semiconductor reserves the right to change or discontinue this product without notice.

http://onsemi.com

MARKING DIAGRAM

PDIP–16

P SUFFIX

Max Power Limitation

Overheating

Detection

Current Sense Input

Demagnetization

Detection Input

ORDERING INFORMATION

Device Package Shipping

MC44605P PDIP–16 25 Units/Rail

CASE 648

A = Assembly Location WL, L = Wafer Lot YY, Y = Year WW, W= Work Week

PIN CONNECTIONS

116

Output

Gnd

4 5 6 7 8

(Top View)

* Winding Short Circuit Detection

MC44605P

AWLYYWW

ref

WSCD* Program

Voltage Feedback Input

Error Amp Output

Disabling Block (C

Soft–Start Input

Osc Capacitor (CT)

Sync and

EHTOVP Input

)

ext

 Semiconductor Components Industries, LLC, 2000

May, 2000 – Rev. 2

1 Publication Order Number:

MC44605/D

MC44605

Block Diagram

Demagnetization

Detection Input

Synchronization

and EHTOVP

Input

Voltage

Feedback

Input

E/A Output

*W.S.C.D. = Winding Short Circuit Detection

ext

Demagnetization

Output

E.H.T.OVP

Block

ref

Management

WSCD

Disabling

Block

Error AMP

–

Oscillator

W.S.C.D*

Comparator

dis

MPL

dis

OHD

Dis

out

demag out

ref

sense

Sense

Input

ref

Reference

Block

Current

Sense

shift

dis

MPL

sense

7 6

MPL

block

Maximum

Power

Limitation

O.H.D.

block

Heating

Detection

Vccenable

Supply

Initialization

Block

Dis

out

Set

PWM Latch

Reset

Thermal

Shutdown

Level

shift

Programmation

dis

OHD

Soft–Start

115

OverCurrent Soft–Start

Input

UVLO1 UVLO2

ref

UVLO2

CC 1

18 V

Buffer

ref

Over Voltage Management

enable

UVLO1

VCCenable

MC44605

Output

Gnd

WSCD

Programmation

http://onsemi.com

MC44605

Sink

0.1

1.0

MAXIMUM RATINGS

Rating Pin # Symbol Value Unit

Total Power Supply and Zener Current (ICC + IZ) 40 mA Output Supply Voltage with Respect to Ground 2

Output Current* 3 mA

Source I

Sink I Output Energy (Capacitive Load per Cycle) W 5.0 µJ Soft–Start V Current Sense, Voltage Feedback, E/A Output, CT, R

WSCD

E.H.T.OVP, Sync Input Current mA

Source 9

Sink 9

Demagnetization Detection Input Current 8 mA

Source I

Sink I Error Amplifier Output Sink Current 13 I Power Dissipation and Thermal Characteristics

Maximum Power Dissipation at TA = 85°C P Thermal Resistance, Junction–to–Air R

Operating Junction Temperature T Operating Ambient Temperature T

*Maximum package power dissipation must be observed.

, MPL, OHD, C

ref

ext

O(Source)

O(Sink)

sync (Source)

(Source)

EHT

sync (Sink)

EHT (Sink)

demag–ib (Source)

demag–ib (Sink)

E/A (Sink)

θJA

J A

18 V

–750

750

–0.3 to 2.2 V V –0.3 to 5.5 V V

–4.0

10 20 mA

0.6 W

100 °C/W 150 °C

–25 to +85 °C

ELECTRICAL CHARACTERISTICS (V

values TA = –25° to +85°C unless otherwise noted.) (Note 1.)

Characteristic

OUTPUT SECTION (Note 2.)

Output Voltage* 3 V

Low Level Drop Voltage (I

High Level Drop Voltage(I

Output Voltage During Initialization Phase 3 V

VCC = 0 to 1.0 V, I

= 1.0 to 5.0 V,

= 5.0 to 13 V,

Output Voltage Rising Edge Slew–Rate (CL = 1.0 nF, TJ = 25°C) dVo/dT – 300 – V/µs Output Voltage Falling Edge Slew–Rate (CL = 1.0 nF, TJ = 25°C) dVo/dT – –300 – V/µs

*VC must be greater than 5.0 V .

1. Adjust VCC above the start–up threshold before setting to 12 V . Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

2. No output signal when the Error Amplifier output is in Low State, i.e., when for instance, VFB = 2.7 V.

Sink

Sink Source

Source

= 10 µA

= 100 µ

= 1.0

= 100 mA) = 500 mA)

= 200 mA) = 500 mA)

and VC = 12 V, R

= 10 kΩ, CT = 2.2 nF, for typical values TA = 25°C, for min/max

ref

Pin # Symbol Min Typ Max Unit

– –

– – – –

1.0

1.4

1.5

2.0

0.1

1.2

2.0

2.7

1.0

http://onsemi.com

MC44605

ELECTRICAL CHARACTERISTICS (V

values TA = –25° to +85°C unless otherwise noted.) (Note 1.)

Characteristic

ERROR AMPLIFIER SECTION

Voltage Feedback Input (V Input Bias Current (VFB = 2.5 V) 14 I Open Loop Voltage Gain (V Unity Gain Bandwidth BW MHz

TJ = 25°C – – –

TA = –25° to +85°C – – 5.5 Voltage Feedback Input Line Regulation (VCC = 10 V to 15 V) V Output Current 13 mA

Sink (V

TA = –25° to +85°C

Source (V

TA = –25° to +85°C

Output Voltage Swing 13 V

High State (I

Low State (I

CURRENT SENSE SECTION

Maximum Current Sense Input Threshold

Feedback (pin14)

Input Bias Current 7 I Propagation Delay (Current Sense Input to Output at VTH of

MOS transistor = 3.0 V)

OSCILLATOR AND SYNCHRONIZATION SECTION

Frequency (TA = –25° to +85°C) Frequency Change with Voltage (VCC = 10 V to 15 V) ∆F Frequency Change with Temperature (TA = –25° to +85°C) ∆F Ratio Charge Current/Reference Current (TA = –25° to +85°C) I Free Mode Oscillator Ratio = I Synchronization Input Threshold Voltage 9 V Negative Clamp Level (I

UNDERVOLTAGE LOCKOUT SECTION

Start–up Threshold 1 V Disable Voltage After Threshold T urn–On (UVLO 1)

(TA = –25° to +85°C)

Disable Voltage After Threshold T urn–On (UVLO 2)

(TA = –25° to +85°C)

1. Adjust VCC above the start–up threshold before setting to 12 V . Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

= 1.5 V, VFB = 2.7 V)

E/A out

= 5.0 V, VFB = 2.3 V)

E/A out

E/A out (source)

E/A out (sink)

= 2.3 V and V

syncth–in

= 2.5 V) 14 V

E/A out

= 2.0 V to 4.0 V) A

E/A out

= 0.5 mA, VFB = 2.3 V) V

= 0.33 mA, VFB = 2.7 V) V

Soft–Start (pin11)

discharge

= 2.0 mA) NEG–SYNC –0.65 –0.5 –0.34 V

and VC = 12 V, R

/(I

discharge

= 1.2 V)

+ I

charge

= 10 kΩ, CT = 2.2 nF, for typical values TA = 25°C, for min/max

ref

Pin # Symbol Min Typ Max Unit

FB–ib

VOL

FBline–reg

Sink

Source

OH OL

7 V

) D 72 75 78 %

1 V

cs–th

cs–ib

PLH(In/Out)

OSC

/∆V – 0.05 – %/V

OSC

/∆T – 0.05 – %/°C

OSC

charge/Iref

syncth

stup–th

disable1

disable2

2.4 2.5 2.6 V

–2.0 –0.6 – µA

65 70 – dB

–10 – 10 mV

2.0 12 –

–2.0 – –0.2

5.5 6.5 7.5 – 1.0 1.1

0.96 1.0 1.04 V

–10 –2.0 – µA

– 120 200 ns

16 – 20 kHz

0.39 – 0.48 –

–250 –200 –150 mV

13.6 14.5 15.4 V

8.3 – 9.6 V

7.0 7.5 8.0 V

http://onsemi.com

MC44605

ELECTRICAL CHARACTERISTICS (V

values TA = –25° to +85°C unless otherwise noted.) (Note 1.)

Characteristic

REFERENCE SECTION

Reference Output Voltage (VCC = 10 V to 15 V) 16 V Reference Current Range (I Reference Voltage Over I

DEMAGNETIZATION DETECTION SECTION (Note 2.)

Demagnetization Detect Input 8

Demagnetization Comparator Threshold (V Propagation Delay (Input to Output, Low to High) t

Input Bias Current (V Minimum Off–Time when the pin 8 is grounded T Negative Clamp Level (I Positive Clamp Level (I

SOFT–START SECTION (Note 3.)

Ratio Charge Current/I Discharge Current (V Clamp Level V Circuit Inhibition Threshold* V VCS Soft–Start Clamp Level (R

*The circuit is shutdown if the Soft–Start pin voltage is lower than this level.

1. Adjust VCC above the start–up threshold before setting to 12 V . Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

2. This function can be inhibited by connecting pin 8 to GND. In this case, there is a minimum off–time equal to T

3. The MC44605 can be shut down by connecting Soft–Start pin (pin 11) to Ground.

soft–start

= V

ref

ref/Rref

Range ∆V

ref

= 65 mV) I

demag

= –2.0 mA) CLVL–neg –0.50 –0.38 –0.25 V

demag

= +2.0 mA) CLVL–pos 0.50 0.72 0.85 V

demag

(TA = –25° to +85°C) I

ref

= 1.0 V) I

soft–start

and VC = 12 V, R

, R = 5.0 k to 25 kΩ) 16 I

Decreasing) V

pin9

= 5 kΩ) V

= 10 kΩ, CT = 2.2 nF, for typical values TA = 25°C, for min/max

ref

Pin # Symbol Min Typ Max Unit

PLH(In/Out)

ref

demag–th

demag–lb

DEM–GND

ss–ch/Iref discharge

SS–CLVL

SSinhi

CSsoft–start

2.4 2.5 2.6 V

–500 – –100 µA

–40 – 40 mV

50 65 80 mV

– 0.5 – µs

–0.5 – – µA

1.5 3.0 4.5 µs

0.37 – 0.43 –

1.5 5.0 – mA

2.2 2.4 2.6 V 30 – 150 mV

0.45 0.5 0.55 V

DEM–GND

http://onsemi.com

MC44605

ELECTRICAL CHARACTERISTICS (V

values TA = –25° to +85°C unless otherwise noted.) (Note 1.)

Characteristic

OVERVOLTAGE SECTION

Propagation Delay (VCC > 18.1 V to V Protection Level on VCC (TA = –25° to +85°C) VCC

EHT OVP SECTION (Note 2.)

Negative Clamp Level (I EHT OVP Input Threshold V EHT OVP Input Bias Current (V

WINDING SHORT CIRCUIT DETECTION SECTION

WSCD Threshold with I

MPL & OHD SECTION

MPL Parameter* Γ MPL Comparator Threshold** V OHD Parameter*** Γ OHD Comparator Threshold**** V

*This parameter is defined in the MPL §. This parameter is obtained by measuring the MPL pin average current and dividing this result by the

corresponding squared VCS, the measured frequency value and the CT value deducted from the measured frequency value. Measurement conditions: V is typically equal to 18 kHz – R

**The MPL comparator output is Dis

***This parameter is defined in the OHD §. This parameter is obtained by measuring the OHD pin average current and dividing this result by

the corresponding squared VCS value and multiplying it by the R Measurement conditions: V is typically equal to 18 kHz – R

****The OHD comparator output is Dis

DISABLING BLOCK SECTION

Delay Pulse Width Ratio (EHTOVP and WSCD Disabling Capacitor Charge

Current)I Ratio (MPL and OHD Disabling Capacitor Charge Current)I Minimum VCC Value Enabling the Disabling Block Latch* V

*Once a fault detection activated it, the Disabling Block Latch gets reset when the VCC becomes lower than this threshold.

TOTAL DEVICE

Power Supply Current

Power Supply Zener Voltage (ICC = 35 mA) V Thermal Shutdown – – 155 – °C

*Refer to Note 1.

**This consumption is measured while the circuit is inhibited by the Definitive Latch.

1. Adjust VCC above the start–up threshold before setting to 12 V . Low duty cycle pulse techniques are used during test to maintain junction temperature as close to ambient as possible.

2. This function can be inhibited by connecting pin 9 to GND. In this case, the synchronization block is inhibited too and the MC44605 works in free mode.

ref

Startup–Up (VCC = 5.0 V with VCC increasing) – 0.35 0.55 Startup–Up (VCC = 9.0 V with VCC increasing) – 0.35 0.55 Startup–Up (VCC = 12 V with VCC increasing) – 0.35 0.55 Operating TA = –25°C to +85°C* – 20 25 Disabling Mode (VCC = 6.0 V)** – – 0.55

synch–in

= 200 µA Vshift 70 100 120 mV

pin15

Feedback(pin 14)

out

= –2.0 mA) NEG–SYNC –0.65 –0.5 –0.35 V

EHT OVP(pin 9)

= 10 kΩ "1%, CT = 2.2 nF).

ref

MPL

= 10 kΩ "1%, CT = 2.2 nF).

ref

OHD

and VC = 12 V, R

Low)

= 0 V) 9 I

= 2.3 V , V

soft–start(pin 11)

ref

= 10 kΩ, CT = 2.2 nF, for typical values TA = 25°C, for min/max

ref

Pin # Symbol Min Typ Max Unit

PHL(In/Out)

prot

ref

EHTOVP

MPL

MPL–th

OHD

OHD–th

= 0.5 V and pins 7, 8, and 9 connected to GND (the working frequency

value.

ref

= 0.5 V and pins 7, 8, and 9 connected to GND (the working frequency

WSCD

Dis–H/Iref

Dis–L/Iref

CCDis

1.0 – 4.0 µs

15.9 – 18.1 V

7.0 7.4 7.8 V

–5.0 – 0 µA

0.185 0.240 0.295 V

2.4 2.5 2.6 V

1.15 1.50 1.85 V

2.4 2.5 2.6 V

– 4.0 – µs

90 100 110 %

2.7 3.1 3.5 %

1.0 – 5.0 V

18.5 – – V

–1

http://onsemi.com

+ 14 hidden pages