SGS Thomson Microelectronics L5993D, L5993 Datasheet

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L5993

CONSTANT POWER CONTROLLER

CURRENT-MODECONTROLPWM SWITCHINGFREQUENCYUP TO 1MHz LOW START-UPCURRENT (< 120µA) CONSTANT OUTPUT POWER VS. SWITCH-

ING FREQUENCY HIGH-CURRENT OUTPUT DRIVE SUITABLE

FOR POWERMOSFET (1A) FULLY LATCHED PWM LOGIC WITH DOU-

BLE PULSE SUPPRESSION PROGRAMMABLEDUTYCYCLE 100%AND50%MAXIMUMDUTYCYCLELIMIT PROGRAMMABLE SOFT START PRIMARY OVERCURRENT FAULT DETEC-

TION WITH RE-START DELAY PWMUVLOWITH HYSTERESIS IN/OUTSYNCHRONIZATION LATCHEDDISABLE INTERNAL 100ns LEADING EDGE BLANK-

ING OF CURRENT SENSE PACKAGE:DIP16 ANDSO16N

DESCRIPTION

This primary controllerI.C., developed in BCD60II technology, has been designed to implement off

BLOCK DIAGRAM

MULTIPOWER BCD TECHNOLOGY

DIP16 SO16N

ORDERING NUMBERS: L5993 (DIP16)

L5993D (SO16)

line or DC-DC power supply applications using a fixedfrequencycurrentmode control. Based on a standard current mode PWM controller this device includes some features such as programmablesoft start, IN/OUT synchronization, disable (to be usedfor over voltage protection and for power management), precise maximum Duty Cycle Control, 100ns leading edge blanking on current sense, pulse by pulse current limit, overcurrent protection with soft start intervention and ”constantpower” functionfor cotrolling throughput powerin multisyncmonitorSMPS.

July 1999

RCT

DIS

C-POWER

ISEN

SYNC DC-LIM

2

+

3

14

2.5V

13

1.2V

-

+

-16

OVER CURRENT

+

-

1V R

DC

SS

DIS

TIMING

BLANKING

PWM

T

FAULT

SOFT-START

2R

V

CC

25V

15V/10V

+

-

SQ R

VREF OK

CLK

DIS

12

SGND COMP

PWM UVLO

6

Vref

+

E/A

-

13V

2.5V7

D97IN765

VREF

48151

9

V

C

10

OUT

11

PGND

5

VFB

1/22

L5993

ABSOLUTEMAXIMUM RATINGS

Symbol Parameter Value Unit

V

CC Supply Voltage (I

I

OUT

Output Peak Pulse Current 1.5 A Analog Inputs & Outputs (6,7) -0.3 to 8 V Analog Inputs & Outputs (1,2,3,4,5,15,14,13, 16) -0.3 to 6 V

P

tot

T

j

T

stg

(*) maximum package power dissipation limits must be observed

Power Dissipation @ T

Junction Temperature, Operating Range -40 to 150 °C Storage Temperature, Operating Range -55 to 150 °C

PIN CONNECTION

< 50mA) (*) selflimit V

CC

@T

=70°C (DIP16)

amb

=50°C (SO16)

amb

1

0.83

W W

SYNC

RCT

DC

VREF

VFB

COMP

SS

V

CC

1 2 3 4 5 6 7 OUT

15 14 13 12 11 10

8V

D97IN783

C-POWER16 DC-LIM DIS ISEN SGND PGND

9

C

THERMAL DATA

Symbol Parameter Value Unit

R

th j-amb

Thermal Resistance Junction -Ambient(DIP16) Thermal Resistance Junction -Ambient(SO16)

80

120

PIN FUNCTIONS

N. Name Function

1 SYNC Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct 2 RCT Oscillator pin for external C 3 DC Duty Cycle control 4 VREF 5.0V +/-1.5% reference voltage at 25°C 5 VFB Error Amplifier Inverting input 6 COMP Error Amplifier Output 7 SS Soft start pin for external capacitor Css 8V 9V

CC Supply for internal ”Signal” circuitry

C

Supply for Power section 10 OUT High current totem pole output 11 PGND Power ground 12 SGND Signal ground 13 ISEN Current sense 14 DIS Disable. It must never be left floating. Tie to SGND if not used. 15 DC-LIM Connecting this pin to Vref, DC is limited to 50%. If it is left floating or grounded no limitation is

imposed 16 C-POWER Constant Power vs. Switching Frequency. Connect a capacitor to SGND. The pin must be

connected toVREF if not used.

components

t,Rt

C/W

° °C/W

2/22

L5993

ELECTRICALCHARACTERISTICS

CC

=15V; Tj= 0 to 105°C; RT=13.3kΩ;CT= 1nF

(V

unless otherwisespecified.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

REFERENCE SECTION

V

Ref

T

S

I

OS

OSCILLATOR SECTION

ERROR AMPLIFIER SECTION

V

I

G

OPL

SVR Supply Voltage Rejection V

V

OL

V

OH

O Output Source Current VCOMP > 4V, V

I

S

R

PWM CURRENT SENSE SECTION

I

b

I

S

SOFT START

I

SSC

I

SSD

V

SSSAT

V

SSCLAMP

LEADING EDGE BLANKING

OUTPUT SECTION

V

OL

V

OH

V

OUT CLAMP

Output Voltage Tj=25°C; IO= 1mA 4.925 5.0 5.075 V Line Regulation V Load Regulation I

= 12 to 20V; Tj =25°C 2.0 10 mV

CC

= 1 to 10mA; Tj =25°C 2.0 10 mV

O

Temperature Stability 0.4 mV/°C Total Variation Line, Load, Temperature 4.80 5.0 5.130 V Short Circuit Current Vref = 0V 30 150 mA Power Down/UVLO V

= 8.5V; I

CC

Initial Accuracy pin 15 = Vref T

Duty Cycle pin 3 = 0,7V, pin 15 = Vref

pin 3 = 0.7V, pin 15 = OPEN

Duty Cycle pin 3 = 3.2V, pin 15 = Vref

pin 3 = 3.2V, pin 15 = OPEN

= 0.5mA 0.2 0.5 V

sink

=25°C

V

j

= 12 to 20V9593

CC

100 100

105 107

0 0

47

93 Duty Cycle Accuracy pin 3 = 2.79V, pin 15 = OPEN 75 80 85 % Oscillator Ramp Peak 2.8 3.0 3.2 V Oscillator Ramp Valley 0.75 0.9 1.05 V

Input Bias Current V Input Voltage V Open Loop Gain V

Output Low Voltage I Output High Voltage I

Output Sink Current V

to GND 0.2 3.0

FB COMP=VFB

= 2 to 4V 60 90 dB

COMP

= 12 to 20V 85 dB

CC

= 2mA, VFB= 2.7V 1.1 V

sink

= 0.5mA, VFB= 2.3V 5 6 V

source

= 2.3V 0.5 1.3 2.5 mA

FB

COMP > 1.1V, V

= 2.7V 2 6 mA

FB

2.42 2.5 2.58 V

Unit Gain Bandwidth 1.7 4 MHz Slew Rate 8 V/µs

Input Bias Current I Maximum Input Signal V

=0 3 15

sen

= 5V 0.92 1.0 1.08 V

COMP

Delay to Output 70 100 ns Gain 2.85 3 3.15 V/V

SS Charge Current 14 20 26 µA SS Discharge Current VSS = 0.6V, Tj =25°C 5 10 15 µA SS Saturation Voltage DC = 0% 0.6 V SS Clamp Voltage 7 V

Internal Masking Time 100 ns

Output Low Voltage IO= 250mA 1.0 V Output High Voltage IO= 20mA; VCC = 12V 10 10.5 V

= 200mA; VCC = 12V 9 10 V

I

O

Output Clamp Voltage IO= 5mA; VCC = 20V 13 V

kHz kHz

% %

µ

A

3/22

L5993

ELECTRICALCHARACTERISTICS

(continued.)

Symbol Parameter Test Condition Min. Typ. Max. Unit

OUTPUT SECTION

Collector Leakage V Fall Time C

Rise Time C

UVLO Saturation V

= 20V VC= 24V 2 20 µA

CC

O

C

O O

C

O

CC

= 1nF = 2.5nF

=0VtoV

CCON;Isink

= 10mA 1.0 V

20 35

50 70

60 ns

100 ns

SUPPLY SECTION

V

CCON

V

CCOFF

hys ULVOHysteresis 4.5 5 V

V

I

S

I

op

Startup voltage 14 15 16 V Minimum Operating Voltage 9 10 11 V

Start Up Current Before Turn-on at:

V

CC

=V

CCON

- 0.5V

Operating Current CT = 1nF,RT= 13.3kΩ,C

O

40 75 120 µA

913mA

=1nF

I

q

V

Z

Quiescent Current (After turn on), CT = 1nF,

R

= 13.3kΩ,CO= 0nF

T

7.0 10 mA

Zener Voltage I8= 20mA 21 25 30 V

SYNCHRONIZATION SECTION

Master Operation

V

1

I

1

Clock Amplitude I Clock Source Current Vclock = 3.5V 3 7 mA

= 0.8mA 4 V

SOURCE

Slave Operation

V

1

Sync Pulse Low Level 1 V

High Level 3.5 V

I

1

Sync Pulse Current VSYNC = 3.5V 0.5 mA

OVER CURRENT PROTECTION

V

t

Fault Threshold Voltage 1.1 1.2 1.3 V

DISABLE SECTION

Shutdown threshold 2.4 2.5 2.6 V

I

SH

Shutdown Current VCC= 15V 330 µA

CONSTANT POWER

ns

Figure 1. Quiescentcurrentvs. input voltage.

Iq [mA]

30 20

8 6

4

0.2

0.15

0.1

0.05 0

04 8

4/22

V14 = 0, Pin2 = open

Tj = 25°C

12 16 20 24

Vcc [V]

28

Figure2. Quiescent current vs.input voltage

(afterdisable).

Iq [µA]

350 300 250 200 150 100

50

0

0 4 8 12162024

Vcc [V]

V14 = Vref

Tj = 25 °C

L5993

Figure 3. Quiescentcurrentvs. input voltage.

Iq [ mA]

9.0

V14= 0, V5 = Vref

8.5

8.0

7.5

7.0 8 1012141618202224

Rt = 4 .5Kohm,T j = 25°C

1Mhz

100Khz

Vcc [V]

500Khz

300Khz

Figure 5. Quiescentcurrentvs. input voltage

and switchingfrequency.

Iq [mA]

36

Co = 1nF, Tj = 2 5°C

30

24

18

12

DC = 1 00%

1MHz

500KHz 300KHz

100KHz

Figure4. Quiescentcurrent vs. input voltage

and switchingfrequency.

Iq [m A]

36

30

24

18

12

6

0

8 10121416182022

C o = 1nF, T j = 25 °C

DC = 0%

1M Hz

50 0KH z 30 0KH z

100KHz

Vcc [V]

Figure6. Reference voltage vs. load current.

Vref [V]

5.1

5.05

5

4.95

Vcc=15V Tj= 25°C

6 0

8 10121416182022

Vcc [V]

Figure 7. Vref vs. junctiontemperature.

Vref [V])

5.1

5.05

5

4.95

4.9

-50 -25 0 25 50 75 100 125 150

Vcc = 15V Iref = 1mA

Tj (°C)

4.9 0 5 10 15 20 25

Iref [mA]

Figure8. Vref vs. junction temperature.

Vref [V]

5.1

Vcc = 15V

5.05

5

4.95

4.9

-50 -25 0 25 50 75 100 125 150

Iref= 20mA

Tj (°C)

5/22

L5993

Figure 9. Vref SVRR vs. switchingfrequency.

SVRR (dB)

120

80

40

0

1 10 100 1000 10000

fsw (Hz)

Vcc=15V Vp-p=1V

Figure 11. Output saturation.

Vsat = V [V]

2.5

2

1.5

10

Vcc = Vc = 15V

Tj = 25°C

Figure10. Output saturation.

Vsat = V [V]

16

14

12

10

8

6

0 0.2 0.4 0.6 0.8 1 1.2

10

Vcc = Vc = 15V

Tj = 25°C

Isource [A]

Figure12. UVLO Saturation

Ipin10 [mA] 50

40

30

Vcc < Vccon

beforeturn-on

1

0.5

0

0 0.2 0.4 0.6 0.8 1 1.2

Isink [A]

Figure 13. Timing resistorvs. switching fre-

quency.

fsw (KHz)

5000

2000 1000

500

200 100

50

20 10

5.6nF

10 20 30 40

Vcc = 15V, V15 =0V Tj = 25°C

2.2nF

Rt (kohm)

100pF

220pF

470pF

1nF

20

10

0

0 200 400 600 800 1,000 1,200 1,400

Vpin10 [mV]

Figure14. Switchingfrequencyvs. tempera-

ture

fsw (KHz) 320

Rt= 4.5Kohm, Ct = 1nF

310

300

290

280

-50 -25 0 25 50 75 100 125 150

Vcc = 15V,V15=Vref

Tj (°C)

6/22

L5993

Figure15.Switchingfrequencyvs.temperature.

fsw (KHz) 320

Rt= 4.5Kohm, Ct = 1nF

310

300

290

280

-50 -25 0 25 50 75 100 125 150

Vcc = 15V,V15= 0

Tj (°C)

Figure 17. Maximum Duty Cycle vs Vpin3.

DC Control Voltage Vpin3 [V]

3.5

V15 = Vref

3

V15 = 0V

Figure16. Dead time vs Ct.

Deadtime [ns]

1,500

1,200

900

600

300

Rt =4.5Kohm

V15= 0V

V15= Vref

246810

TimingcapacitorCt [nF]

Figure18. Delay to output vs junctiontem-

perature.

Delay to output (ns)

42

40

2.5

2

Rt = 4.5Kohm,

1.5

Ct = 1nF

1

0 102030405060708090100

Duty Cycle [%]

Figure 19. E/A frequency response.

G [dB]

150

100

50

0

Phase

140

120

100

80

60

40

38

36

34

32

30

28

-50 -25 0 25 50 75 100 125 150 Tj (°C)

PIN10 = OPEN

1V pulse on PIN13

0.01 0.1 1 10 100 1000 10000 100000

20

f(KHz)

7/22