INFINEON ICE3AS02, ICE3BS02, ICE3AS02G, ICE3BS02G User Manual

Datasheet, V1.1, 21 May 2004

ICE3AS02 / ICE3BS02 ICE3AS02G / ICE3BS02G

Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell

Power Management & Supply

Never stop thinking.

F3 Revision History: 2004-05-21 Datasheet

Previous Version: Page Subjects (major changes since last revision)

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Edition 2004-05-21 Published by Infineon Technologies AG,

St.-Martin-Strasse 53, D-81541 München

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circuits, descriptions and charts stated herein. Infineon Technologies is an approved CECC manufacturer.

Information

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Infineon Technologies Components may only be used in life-support devices or systems with the express written approval of Infineon Technologies, if a fa ilure of such components can r easonably be e xpected to cause the f ailure of that life-support device or system, or to aff ect the safety or effectiveness of that device or system. Life support devices or systems are intended to be implanted in the human body, or to support and/or maintain and sustain and/or protect human life. If they fail, it is reasonable to assume that the health of the user or other persons may be endangered.

ICE3AS02 / ICE3BS02

Off-Line SMPS Current Mode Controller with integrated 500V Startup Cell

Product Highlights

ICE3AS02G / ICE3BS02G

• Leadfree DIP package

• Active Burst Mode to reach the lowest Standby Power Requirements < 100mW

• Protection features (Auto Restart Mode) to increase robustness and safety of the system

• Adjustable Blanking Window for high load jumps to increase system reliability

Features

• Active Burst Mode for lowest Standby Power @ light load controlled by Feedback Signal

• Fast load jump response in Active Burst Mode

• 500V Startup Cell switched off after Start Up

• 100/67kHz internally fixed switching frequency

• Auto Restart Mode for Overtemperature Detection

• Auto Restart Mode for VCC Overvoltage Detection

• Auto Restart Mode for Overload and Open Loop

• Auto Restart Mode for VCC Undervoltage

• Blanking Window for short duration high current

• User defined Soft Start

• Minimum of external components required

• Max Duty Cycle 72%

• Overall tolerance of Current Limiting < ±5%

• Internal PWM Leading Edge Blanking

• Soft switching for low EMI

Description

The F3 Controller provides Active Burst Mode to reach the lowest Standby Power Requirements <100mW at no load. As the controller is always active during Active Burst Mode, there is an immediate response on load jumps without any black out in the SMPS. In Active Burst Mode the ripple of the output voltage can be reduced <1%. Furthermore, to increase the robustness and safety of the system, the device enters into Auto Restart Mode in the cases of Overtemperature, VCC Overvoltage, Output Open Loop or Overload and VCC Undervoltage. By means of the internal precise peak current limitation, the dimension of the transformer and the secondary diode can be lowered which leads to more cost efficiency. An adjustable blanking window prevents the IC from entering Auto Restart Mode or Active Burst Mode unintentionally in case of high load jumps.

Typical Appl icati on

85 ... 270 VAC

GND

Bulk

Start up Cell

Power

Management

ICE3AS02/G ICE3BS02/G

VCC

PWM Controller

Curr ent Mode

Precise Lo w

Tolerance Peak

Current Limitation

Control Unit

Active Burst Mode

Auto Restart Mode

VCC

Snubber

Gate

Soft S

PG-DIP-8-6

test

P-DSO-8-8

Converter

DC Output

Sense

SoftS

Type Ordering Code F

OSC

Package

ICE3AS02 Q67040-S4661-A101 100kHz PG-DIP-8-6 ICE3BS02 Q67040-S4637-A101 67kHz PG-DIP-8-6 ICE3AS02G 100kHz P-DSO-8-8 ICE3BS02G 67kHz P-DSO-8-8

Version 1.1 3 21 May 2004

ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G

Table of Contents Page

1 Pin Configuration and Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.1 Pin Configuration with PG-DIP-8-6 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.2 Pin Configuration with P-DSO-8-8 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5

1.3 Pin Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6

2 Representative Blockdiagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7

3 Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

3.1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

3.2 Power Management . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

3.3 Startup Phase . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9

3.4 PWM Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.4.1 Oscillator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.4.2 PWM-Latch FF1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.4.3 Gate Driver . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10

3.5 Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.5.1 Leading Edge Blanking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.5.2 Propagation Delay Compensation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

3.6 Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.6.1 Adjustable Blanking Window . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12

3.6.2 Active Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.6.2.1 Entering Active Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.6.2.2 Working in Active Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.6.2.3 Leaving Active Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13

3.6.3 Protection Mode(Auto Restart Mode). . . . . . . . . . . . . . . . . . . . . . . . . . . .14

4 Electrical Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

4.1 Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

4.2 Operating Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .16

4.3 Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.3.1 Supply Section 1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.3.2 Supply Section 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.3.3 Internal Voltage Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17

4.3.4 PWM Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

4.3.5 Control Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

4.3.6 Current Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19

4.3.7 Driver Section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .20

5 Typical Performance Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . .21

6 Outline Dimension . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22

Version 1.1 4 21 May 2004

ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G

Pin Configuration and Functionality

1 Pin Configuration and Functionality

1.1 Pin Configuration with PG-DIP-8-6

1.2 Pin Configuration with P-DSO-8-8

Pin Symbol Function

1 SoftS Soft-Start

2 FB Feedback

3 CS Current Sense

4 HV High Voltage Input

5 HV High Voltage Input

6 Gate Driver Stage Output

7 VCC Controller Supply Voltage

8 GND Controller Ground

Package PG-DIP-8-6

GNDSoftS

VCC

Gate

Pin Symbol Function

1 SoftS Soft-Start

2 FB Feedback

3 CS Current Sense

4 Gate Driver Stage Output

5 HV High Voltage Input

6 N.C. Not connected

7 VCC Controller Supply Voltage

8 GND Controller Ground

Package P-DSO-8-8

Gate

GNDSoftS

VCC

N.C.

Figure 1 Pin Configuration PG-DIP-8-6(top view)

Note: Pin 4 and 5 are shorted within the DIP

package.

Version 1.1 5 21 May 2004

Figure 2 Pin Configuration P-DSO-8-8(top view)

ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G

1.3 Pin Functionality

SoftS (Soft Start & Auto Restart Control)

The SoftS pin combines the functions of Soft Start during Start Up and error detection for Auto Restart Mode. These functions are implemented and can be adjusted by means of an external capacitor at SoftS to ground. This capacitor also provides an adjustable blanking window for high load jumps, before the IC enters into Auto Restart Mode.

FB (Feedback)

The information about the regulation is provided by the FB Pin to the internal Protection Unit and to the internal PWM-Comparator to control the duty cycle. The FBSignal controls in case of light load the Active Burst Mode of the controller.

CS (Current Sense)

The Current Sense pin senses the voltage developed on the series resistor inserted in the source of the external PowerMOS. If CS reaches the internal threshold of the Current Limit Comparator, the Driver output is immediately switched off. Furthermore the current information is provided for the PWMComparator to realize the Current Mode.

Gate

The Gate pin is the output of the internal driver stage connected to the Gate of an external PowerMOS.

Pin Configuration and Functionality

HV (High Voltage)

The HV pin is connected to the rectified DC input voltage. It is the input for the integrated 500V Startup Cell.

VCC (Power supply)

The VCC pin is the positive supply of the IC. The operating range is between 8.5V and 21V.

GND (Ground)

The GND pin is the ground of the controller.

Version 1.1 6 21 May 2004

ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G

2 Representative Blockdiagram

OUT

Converter

DC Output

Snubber

GND

VCC

Startup Cell

PWM Section

0.72

Duty Cycle Max

max

Duty Cycle

Oscillator

6.5V

15V

Voltage

8.5V

Reference

Undervoltage Lockout

Gate

Driver

FF1

Clock

Soft-Start

Comparator

Soft Start

PWM

Comparator

Representative Blockdiagram

Sense

10k

1pF

Current Limiting

Edge

220ns

Leading

Blanking

csth

0.257V

C10

C12

Compensation

Propagation-Delay

G10

ICE3BS02/G

x3.7

0.85V

PWM OP

Current Mode

100kHz 67kHz

ICE3AS02/G

Mode

Bulk

85 ... 270 VAC

Power Management

6.5V

Reset

Internal Bias

Power-Down

8.0us

Spike

Blanking

>140°C

3.25k

SoftS

Thermal Shutdown

C11

VCC

SoftS

17V

4.0V

4.4V

Auto Restart

4.8V

5.4V

6.5V

Mode

G11

Active Burst

C6a

C6b

3.4V

4.0V

1.32V

10pF

Control Unit

ICE3AS02/G ICE3BS02/G

OSC

Figure 3 Representative Blockdiagram

Version 1.1 7 21 May 2004

ICE3AS02 / ICE3AS02G / ICE3BS02 / ICE3BS02G

3 Functional Description

All values which are used in the functional description are typical values. For calculating the worst cases the min/max values which can be found in section 4 Electrical Characteristics have to be considered.

3.1 Introduction

The F3 is the further development of the F2 to meet the requirements for the lowest Standby Power at minimum load and no load conditions. A new fully integrated Standby Power concept is implemented into the IC in order to keep the application design easy. Compared to F2 no further external parts are needed to achieve the lowest Standby Power. An intelligent Active Burst Mode is used for this Standby Mode. After entering this mode there is still a full control of the power conversion by the secondary side via the same optocoupler that is used for the normal PWM control. The response on load jumps is optimized. The voltage ripple on V controlled in this mode.

The usually external connected RC-filter in the feedback line after the optocoupler is integrated in the IC to reduce the external part count.

Furthermore a high voltage startup cell is integrated into the IC which is switched off once the Undervoltage Lockout on-threshold of 15V is exceeded. The external startup resistor is no longer necessary. Power losses are therefore reduced. This increases the efficiency under light load conditions drastically.

The Soft-Start capacitor is also used for providing an adjustable blanking window for high load jumps. During this time window the overload detection is disabled. With this concept no further external components are necessary to adjust the blanking window.

An Auto Restart Mode is implemented in the IC to reduce the average power conversion in the event of malfunction or unsafe operating condition in the SMPS system. This feature increases the system’s robustness and safety which would otherwise lead to a destruction of the SMPS. Once the malfunction is removed, normal operation is automatically initiated after the next Start Up Phase.

The internal precise peak current limitation reduces the costs for the transformer and the secondary diode. The influence of the change in the input voltage on the power limitation can be avoided together with the integrated Propagation Delay Compensation. Therefore the maximum power is nearly independent on the input voltage which is required for wide range SMPS. There is no need for an extra over-sizing of the SMPS, e.g. the transformer or PowerMOS.

is minimized. V

out

is further on well

out

Functional Description

3.2 Power Management

6.5V

which is

VCC

=8.5V the

CCoff

SoftS

VCC

Start up Cell

Undervoltage Lockout

15V

8.5V

SoftS

Power Management

Internal Bias

Voltage

Reference

Auto Restart Mode

Active Bur st Mode

Figure 4 Power Management

The Undervoltage Lockout monitors the external supply voltage V main line the internal Startup Cell is biased and starts to charge the external capacitor C connected to the VCC pin. This VCC charge current which is provided by the Startup Cell from the HV pin is

1.05mA. When V =15V the internal voltage reference and bias

CCon

circuit are switched on. Then the Startup Cell is switched off by the Undervoltage Lockout and therefo re no power losses present due to the connection of the Startup Cell to the bus voltage (HV). To avoid uncontrolled ringing at switch-on a hysteresis is implemented. The switch-off of the controller can only take place after Active Mode was entered and V falls below 8.5V.

The maximum current consumption before the controller is activated is about 160µA.

When V

VCC

internal reference is switched off and the Power Down reset let T1 discharging the soft-start capaci tor C pin SoftS. Thus it is ensured that at every startup cycle the voltage ramp at pin SoftS starts at zero.

The internal Voltage Reference is switched off if Auto Restart Mode is entered. The current consumption is then reduced to 300µA.

. When the SMPS is plugged to the

VCC

exceeds the on-threshold

VCC

falls below the off-threshold V

Version 1.1 8 21 May 2004

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