Philips ne5562, se5562 DATASHEETS

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1

1994 Aug 31 853-0811 13721

DESCRIPTION

The NE/SE5562 is a single-output control circuit for switched-mode power supplies. This single monolithic IC contains all control and protection features needed for full-featured switched-mode power supplies.

The 100mA source/sink output is designed to drive power FETs directly. The associated output logic is designed to prevent double pulsing or cross-conduction current spiking on the output.

All of the control and protect features work cycle-by-cycle up to the maximum operating frequency of 600kHz.

For ease of interface, all digital inputs are TTL or CMOS compatible. The NE5562 is supplied in 20-pin glass/ceramic (Cerdip), plastic

DIP, and plastic SO packages. The NE grade part is characterized and guaranteed over the commercial ambient temperature range of 0°C to +70°C and junction temperature range of 0°C to +85°C. The SE5562 is supplied in the glass/ceramic (Cerdip) package. The SE grade part is characterized and guaranteed over the ambient temperature range of -55 to +125°C and junction temperature range of -55 to +135°C.

FEATURES

•Stabilized power supply

•Temperature-compensated reference source

•Sawtooth generator

•Pulse width modulator

•Remote on/off switching

•Current limiting (2 levels)

PIN CONFIGURATION

1 2 3 4 5 6 7 8 9

10

11

12

13

14

20 19 18 17 16 15

D, F, N Packages

TOP VIEW

FEED FORWARD

EXTERNAL MOD IN

DUTY CYCLE CONTROL

REMOTE ON/OFF

FEEDBACK VOLTAGE

ERROR AMP OUT

C

T

R

T

V

I

V

Z

GROUND OUTPUT DEMAG OVERVOLT IN

C DELAY

AUX COMP INPUT

CURRENT SENSE

OUT INVERT CONTROL

AUX COMP HYSTERESIS

V

S

EXTERNAL SYNC IN

SL00388

Figure 1. Pin Configuration

•Auxiliary comparator, with adjustable hysteresis

•Loop fault protection

•Demagnetization/overvoltage protection

•Duty cycle adjust and clamp

•Feed-forward control

•External synchronization

•Total shutdown after adjustable number of overcurrent faults

•Soft-start

ORDERING INFORMATION

DESCRIPTION TEMPERATURE RANGE ORDER CODE DWG #

20-Pin Plastic Small Outline (SO) Package 0 to +70°C NE5562D 1021B 20-Pin Plastic Dual In-Line Package (DIP) 0 to +70°C NE5562N SOT146-1 20-Pin Ceramic Dual In-Line Package (CERDIP) -55°C to +125°C SE5562F SOT146-1

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

2

BLOCK DIAGRAM

FEEDFORWARD

1

11

EXTERNAL SYNC IN

+ +

– +

S

R

Q

OSC LATCH

OSCILLATOR

3 2

OFF

ON

CLOCK

TIME DELAY

OFF

ON

1.5V

REMOTE ON/OFF

6

ERROR AMP OUT

10

FEEDBACK VOLTAGE

8

EXTERNAL MOD IN

4

DUTY CYCLE CONTROL

5

CLOCK

LOOP FAULT COMP

0.955V

3.80V

PWM COMP

ON/OFF COMP

2k

OC1

0C2

0.955V SLOW

START COMP

OC2

NORM

–

+

0.528V

OVERCURRENT 1 COMP

OVERCURRENT 2 COMP

OC CHARGE PUMPS

NORM

LV STOP

START/ STOP LATCH

R

S

Q

0.645V

OUTPUT LATCH

OC1

NORM

LOW BULK

BULK SENSE COMP

1:1

16

POWER SUPPLY CKTS

3.80V

SHUT DOWN LATCH

3.80V

OC ACCUM COMP

TRIP

NORM

S

R

Q

– +

+V

OC1 OC2

AUXILIARY COMP HYSTERESIS

AUXILIARY COMP INPUT

12

ERROR AMP

DEMAG/OV IN

18

3.80V

DEMAG/OV COMP

0V

NORM

OUTPUT

19

OUTPUT INVERT CONTROL

15

POWR OUTPUT NOR

CURRENT SENSE

GND

14

20

9

0.955V

0.528V

0.645V

DELAYED CLOCK

S

R

– +

–

+

–

+

–

+

–

+

13 3.80V

3.80V –

+

–

+

C

DELAY

1µA

11µA 80µA

V

I

V

Z

V

S

17

Q

OC1-2 LATCHES

7

SL00389

Figure 2. Block Diagram

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

3

ABSOLUTE MAXIMUM RATINGS

SYMBOL PARAMETER RATING UNIT

Supply

V

S

voltage-fed mode (Pin 17) 16 V

I

CC

current-fed mode (Pin 7) 30 mA

Output transistor 100 mA

output current

Sync (Pin 11) V

S

V

Duty cycle control (Pin 5) V

Z

V

Remote on/off (Pin 6) V

S

V

Output invert control (Pin 15) V

S

V

Feedback pin (Pin 8) V

Z

V

C

DELAY

(Pin 16) V

Z

V

External mod in (Pin 4) V

S

V

FF Feed-forward (Pin 1) V

S

V

Demag/overvoltage in (Pin 18) V

Z

V

Current sense (Pin 14) V

S

V

80Low supply sense and hysteresis (Pins 12, 13)

V

S

V

T

J

Operating junction temperature 135 °C

T

STG

Storage temperature range -65 to +150 °C

T

SOLD

Lead soldering temperature (10sec) 300 °C

NOTES:

1. Ground Pin 20 must always be the most negative pin.

2. For power dissipation, see the application section which follows.

RECOMMENDED OPERATING CONDITIONS

SYMBOL PARAMETER RATING UNIT

Supply

voltage-fed 10 to 16 V current-fed 15 mA

T

A

Ambient temperature range

NE grade 0 to +70 °C SE grade -55 to +125 °C

T

J

Junction temperature range

NE grade 0 to +85 °C SE grade -55 to +135 °C

DC AND AC ELECTRICAL CHARACTERISTICS

V

CC

= 12V, specifications apply over temperature, unless otherwise specified.

TEST

SE5562 NE5562

SYMBOL

PARAMETER

TEST

PINS

TEST CONDITIONS

Min Typ Max Min Typ Max

UNIT

Internal reference

V

REF

Reference voltage Internal TA=25°C 3.76 3.80 3.84 3.76 3.80 3.84 V

V

REF

Reference voltage Internal Over temp. 3.72 3.8 3.90 3.725 3.8 3.870 V Temperature stability Internal 30 30 ppm/°C

Long-term stability Internal 0.5 0.5

µV/1000

hrs

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

4

DC AND AC ELECTRICAL CHARACTERISTICS (Continued)

V

CC

= 12V, specifications apply over temperature, unless otherwise specified.

TEST

SE5562 NE5562

SYMBOL

PARAMETER

TEST

PINS

TEST CONDITIONS

Min Typ Max Min Typ Max

UNIT

Reference

V

Z

Zener voltage 9

IL=7mA,

T

A

=25°C

7.35 7.60 7.75 7.35 7.6 7.75 V

V

Z

Zener voltage 9

IL=7mA,

Over temp.

7.25 7.80 7.20 7.78 V

∆VZ/ ∆T Temperature stability 9 IL<1mA 50 50 ppm/°C

Low supply shutdown

Comparator threshold voltage

Internal TA=25°C 8.30 8.45 8.75 8.30 8.45 8.75 V

Comparator threshold voltage

Internal Over temp. 8.00 8.45 8.90 8.00 8.45 8.90 V

Hysteresis Internal 25 50 8.00 25 50 800 mV

Oscillator

f

MIN

Frequency range, minimum

1, 2,

3, 11

RT=42.7kΩ,

C

T

=0.47µF

60 80 60 80 Hz

f

MAX

Frequency range, maximum

1, 2,

3, 11

RT=2.87kΩ,

C

T

=380pF

600 600 kHz

Initial accuracy

1, 2,

3, 11

fO=52kHz,

R

T

=16kΩ

and C

T

=0.0015µF,

T

A

=25°C

48.6 54 59.4 48.6 54 59.4 kHz

Voltage stability

1, 2, 3,

11, 17

10V<VS<18V -215 -215 ppm/V

Temperature stability

1, 2,

3, 11

300 500 300 500 ppm/°C

Sawtooth peak voltage 2, 3 TA=25°C

1

5.00 5.25 5.40 5.00 5.25 5.40 V

2, 3 Over temp. 4.80 5.25 5.60 4.80 5.25 5.60 V

Sawtooth valley voltage 2, 3 TA=25°C 1.25 1.70 2.00 1.25 1.70 2.00 V

2, 3 Over temp. 1.0 1.7 2.1 1.25 1.7 2.0 V

Sync. in high level 11 2.0 V

Z

2.0 V

Z

V

Sync. in low level 11 0.0 0.8 0.0 0.8 V Sync. in bias current 11

(Sourced),

V

11

<0.8V

0.50 10.0 0.50 10.0 µA

Feed-forward ratio, maximum

1 2 2

Feed-forward duty cycle reduction

1

VFF=2VZ,

T

A

=25°C

11 13.5 19 11 13.5 19 %

1 Over temp. 6 13.5 22 8 22 %

Feed-forward reference voltage

9 V

Z

V

S

V

Z

V

S

V

Feed-forward bias current 1 2.5 50.0 2.5 50.0 µA

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

5

DC AND AC ELECTRICAL CHARACTERISTICS (Continued)

V

CC

= 12V, specifications apply over temperature, unless otherwise specified.

TEST

SE5562 NE5562

SYMBOL

PARAMETER

TEST

PINS

TEST CONDITIONS

Min Typ Max Min Typ Max

UNIT

Error amp

I

BIAS

Input bias current 8 1.0 5.0 1.0 5.0 µA

A

VOL

DC open-loop gain 8, 10 RL>100kΩ 60 86 60 86 dB

V

OH

High output voltage 10 I

SOURCE

=1mA 5 5 V

V

OL

Low output voltage 10 I

SINK

=1mA 2.0 2.0 V

PSRR from VZ and V

S

Internal fO<300kHz -40 -40 dB

BW

Small-signal gain bandwidth product

8 8 MHz

Feedback resistor range 1 240 1 240 kΩ

I

SINK

Output sink current V8=V10=5V 10 10 mA

I

SOURCE

Output source current

V8=3V,

V10=1V

5 5 mA

Sawtooth feedthrough

AV=100,

0% duty cycle

200 200 mV

PWM comparator and modulator

Minimum duty cycle 19

@V

COMP

<,

f=300kHz

0 0 %

Maximum duty cycle 19

@V

COMP

>,

f=300kHz,

V15=0V

95 98 95 98 %

A

CC

Duty cycle 10, 19

f=15kHz to

200kHz,

V

IN

=0.472 V

Z

41 49 55 41 49 55 %

t

PD

Propagation delay to output

2, 19 V15=0 400 400 ns

I

BIAS

Bias current, external modulator input

4 (Sourced) 0.20 20 0.20 20 µA

I

BIAS

Bias current, duty cycle control

5 (Sourced) 0.20 20 0.20 20 µA

Soft-start trip voltage 5 .910 0.955 0.990 0.922 0.955 0.988 V

Remote on/off (shutdown)

Output enabled 6 0 0.80 0 0.80 V Output disabled 6 2 V

Z

2 V

Z

V

I

BIAS

Bias current 6 1 10 1 10 µA

V

IN

Maximum input voltage 6 V

Z

V

Z

V

Delay to output(s) 6, 19 400 400 ns

Current limit comparator(s)

Shutdown, OC2 14 .593 0.645 .697 0.593 0.645 0.697 V Minimum duty cycle, OC1 14 .486 0.528 .570 0.486 0.528 0.570 V

I

BIAS

Bias current 14 (Sourced) 0.5 50 0.5 50 µA

OC

1

C

DELAY

charge current 16 -18.2 -13 -6.5 -18.2 -13 -7.8 µA

OC2 C

DELAY

charge current 16 -770 -550 -250 -770 -550 -330 µA

C

DELAY

Discharge current 16 V12=V

Z

0.4 1.4 4.0 0.8 1.4 2.0 µA

C

DELAY

Shut off trip level 16 TA=25°C 3.75 3.86 3.97 3.75 3.86 3.97 V

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

6

DC AND AC ELECTRICAL CHARACTERISTICS (Continued)

V

CC

= 12V, specifications apply over temperature, unless otherwise specified.

TEST

SE5562 NE5562

SYMBOL

PARAMETER

TEST

PINS

TEST CONDITIONS

Min Typ Max Min Typ Max

UNIT

Auxiliary comparator with shutdown

I

BIAS

Bias current 12 (Sourced) 1 10 1 10 µA Threshold voltage 12 3.69 3.80 3.91 3.69 3.80 3.91 V

C

DELAY

Discharge current 12 VIN=3V 5 10 5 10 mA Hysteresis 12, 13 10 10 mV

Demagnetization overvoltage comparator

I

BIAS

Bias current 18 2 10 2 10 µA Threshold voltage 18 3.62 3.80 3.91 3.69 3.80 3.91 V Hysteresis 18 10 10 mV

Output stage

V

OH

High output voltage 19 I

SOURCE

=100mA VS-2.5 VS-1.9 VS-2.5 VS-1.9 V

19 I

SINK

=2mA 0.16 0.4 0.16 0.4 V

19

I

SINK

=100mA,

T

A

=25°C

1.4 2.0 1.4 2.0 V

OL

19

I

SINK

=100mA,

over temp.

2.25 2.25 V

I

SINK

max 19 100 100 mA

I

SOURCE

max 19 100 100 mA

t

R

Rise time 19 CL=2000pF 160 160 ns

t

F

Fall time 19 CL=2000pF 80 80 ns

Supply current/voltage

I

CC

Supply current 17

10V<VS<16V

(Voltage-fed mode),

V

I<VS

9 15 9 15 mA

V

S

Input voltage 7, 17

II=15mA,

(Current-fed mode)

V

S

=meter

14.2 15.3 16.7 14.2 15.3 16.7 V

Operating frequency range for all functions but feed-forward working cycle-by-cycle

f

MIN

Minimum frequency All

RT=42.7kΩ,

C

T

=0.47µF

60 80 60 80 Hz

f

MAX

Maximum frequency All

RT=2.87kΩ,

C

T

=380pF

600 1000 600 1000 kHz

FREQUENCY (kHz)

10

3

10

2

10

1

10

0

10

2

5 x 1021035 x 10

3

10

4

CT (pF)

TA = 25°C

RT = 2.5kΩ RT = 5kΩ

RT = 10kΩ RT = 20kΩ

RT = 40kΩ

SL00390

Figure 3. Frequency vs RT, CT NE/SE5562

V

OL

Low output voltage

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

7

40 30 20 10

0

100

1k 10k 100k 1M

10M

GAIN (dB)

0 –30 –60 –90 –120 –150 –180

PHASE (DEG)

FREQUENCY

TA = 25°C

CLOSED-LOOP GAIN

PHASE

SL00391

Figure 4. Error Amplifier Closed-Loop Response

PWM INPUT VOLTAGE (V)

100

90 80 70 60 50 40 30 20 10

0

1 2 3 4 5 6 7 8 9 10

DUTY CYCLE (%)

VCC = 12V TA = 25°C

SL00392

Figure 5. Duty Cycle vs PWM Input Voltage

FEED-FORWARD VOLTAGE (V)

TA = 25°C

DUTY CYCLE (%)

100

90 80 70 60 50 40 30 20 10

0

5 6 7 8 9 10 11 12 13 14 15

SL00393

Figure 6. Duty Cycle vs Feed-forward Voltage

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

8

SUPPLY VOLTAGE (PIN 17)(V)

SUPPLY CURRENT (PIN 17) (mA)

22 20 18 16 14 12 10

8 6 4 2 0

0 2 4 6 8 10 12 14 16 18 20 22 24

TA = 25°C

SL00394

Figure 7. Current-Feed Characteristics

SUPPLY VOLTAGE (PIN 17)(V)

SUPPLY CURRENT (PIN 17) (mA)

22 20 18 16 14 12 10

8 6 4 2 0

0 2 4 6 8 10 12 14 16 18 20 22 24

TA = 25°C

SL00395

Figure 8. Voltage-Feed Characteristics

Philips Semiconductors Product specification

NE/SE5562Switched-mode power supply control circuit

1994 Aug 31

9

THE NE/SE5562 THEORY OF OPERATION INTRODUCTION

Switched-mode power conversion relies on the principle of pulsed energy storage in an inductive or capacitive element. Capacitive switched converters are typically used with low power systems for which only tens of milliamperes are required. Medium and high power converters tend to use inductive storage elements as shown in Figures 9-11 with which a single switch may be moved around to create step-up (flyback) positive or negative polarity and step-down (forward or buck) conversion from a fixed-voltage source. The relationship between input and output voltage in each case is controlled by the switching on-to-off ratios, which is termed duty cycle. Duty cycle modulation is the common factor in this basic type of power control mechanism. By adding a high-gain operational amplifier, having one input tied to a stable DC reference voltage, configured in a negative feedback loop to maintain a constant output voltage as shown in Figure 12, the switched-mode controller becomes a dynamic voltage regulator. It is this single-switch topology that is most readily adapted to the NE/SE5562 SMPS Control IC.

The ability to switch inductor currents at rates up to 600kHz with state-of-the-art power FETs makes the design of small, efficient switching power converters an attainable reality. Protective features such as programmable slow-start and cycle-by-cycle current limiting allow safe, maintenance-free power supplies to be mass-produced at reduced cost to the manufacturer. Integrated technology makes long-term reliability a predictably achievable goal.

V

OUT



 V

IN

1  

R

L

D

O

SW

V

IN

L

C

O

δ

–

+

COM

SL00396

Figure 9. Negative Output Flyback Converter

V

OUT



V

IN

1  

R

L

D

O

SW

V

IN

L

C

O

δ

–

+

COM

+

SL00397

Figure 10. Positive Output Flyback Converter

WHERE  

tSWON

T

PERIOD

V

OUT

 V

IN

R

L

D

B

SW

V

IN

L

C

O

δ

–

+

COM

+

SL00398

Figure 11. Forward Converter (Single Inductor) Step Down

PWM

L

C

REGULATED OUTPUT

A

+

–

V

IN

UNREGULATED

DC

V

REF

I

SW

I

L

R

L

R

F

R

2

R

1

+

–

+

–

SL00399

Figure 12. The Forward (Buck) Converter (V

OUT

= VIN(δ))

i t



E L

SWITCH

CURRENT

DIODE

CURRENT

TOTAL

INDUCTOR

CURRENT

MAGNETIZATION CURRENT

LOAD CURRENT

AVERAGE INDUCTOR CURRENT

SL00400

Figure 13. PWM Switching Waveforms