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L5991AD13TR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23
L5991
L5991A
PRIMARY CONTROLLER WITH STANDBY
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UP CURRENT (< 120
µ
A)
HIGH-CURRENT OUTPUT DRIVE SUITABLE
FOR POWER MOSFET (1A)
FULLY LATCHED PWM LOGIC WITH DOU-
BLE PULSE SUPPRESSION
PROGRAMMABLE DUTY CYCLE
100% AND 50% MAXIMUM DUTY CYCLE LIMIT
STANDBY FUNCTION
PROGRAMMABLE SOFT START
PRIMARY OVERCURRENT FAULT DETEC-
TION WITH RE-START DELAY
PWM UVLO WITH HYSTERESIS
IN/OUT SYNCHRONIZATION
LATCHED DISABLE
INTERNAL 100ns LEADING EDGE BLANK-
ING OF CURRENT SENSE
PACKAGE: DIP16 AND SO16
DESCRIPTION
This primary controller I.C., developed in BCD60II
technology, has been designed to implement off
line or DC-DC power supply applications using a
fixed frequency current mode control.
Based on a standard current mode PWM control-
ler this device includes some features such as
programmable soft start, IN/OUT synchronization,
disable (to be used for over voltage protection and
for power management), precise maximum Duty
Cycle Control, 100ns leading edge blanking on
current sense, pulse by pulse current limit, over-
current protection with soft start intervention, and
Standby function for oscillator frequency reduction
when the converter is lightly loaded.
August 2001
®
+
-
+
-
TIMING
2
3
+
-
14
T
Vref
CLK
2.5V
+
-
1.2V
13
BLANKING
PWM
FAULT
SOFT-START
R
SQ
25V
15V/10V
VREF OK
DIS
+
-
E/A
1V R
2R
DIS
2.5V
7
6
5
11
10
9
48151
13V
PWM UVLO
12
SGND COMP
SS
ISEN
DIS
DC
RCT
SYNC DC-LIM
V
CC
VREF
D97IN725A
VFB
PGND
OUT
V
C
OVER CURRENT
STAND-BY
ST-BY
VREF
16
BLOCK DIAGRAM
ORDERING NUMBERS:
L5991/L5991A (DIP16)
L5991D/L5991AD (SO16)
MULTIPOWER BCD TECHNOLOGY
DIP16 SO16
1/23
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
CC
Supply Voltage (I
CC
< 50mA) (*) selflimit V
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
Power Dissipation @ T
amb
= 70°C (DIP16)
@ T
amb
= 50°C (SO16)
1
0.83
W
W
T
j
Junction Temperature, Operating Range -40 to 150 °C
T
stg
Storage Temperature, Operating Range -55 to 150 °C
(*) maximum package power dissipation limits must be observed
THERMAL DATA
Symbol Parameter Value Unit
R
th j-amb
Thermal Resistance Junction -Ambient
(DIP16)
80 °C/W
Thermal Resistance Junction -Ambient
(SO16)
120 °C/W
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
T
, R
A
, R
B
components
3 DC Duty Cycle control
4 VREF 5.0V +/-1.5% reference voltage @ 25°C
5 VFB Error Amplifier Inverting input
6 COMP Error Amplifier Output
7 SS Soft start pin for external capacitor Css
8V
CC
Supply for internal "Signal" circuitry
9V
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 ST-BY Standby. Connect a resistor to RCT. Connect to VREF or floating if not used.
SYNC
RCT
DC
VREF
VFB
SS
COMP
1
3
2
4
5
6
7OUT
SGND
PGND
ISEN
DIS
DC-LIM
ST-BY16
15
14
13
12
10
11
V
CC
8V
C
9
PIN CONNECTION
L5991 - L5991A
2/23
ELECTRICAL CHARACTERISTICS
(V
CC
= 15V; T
j
= 0 to 105
°
C; R
T
= 13.3k
Ω
(*) C
T
= 1nF;
unless otherwise specified.)
Symbol Parameter Test Condition Min. Typ. Max. Unit
REFERENCE SECTION
V
REF
Output Voltage T
j
= 25°C; I
O
= 1mA 4.925 5.0 5.075 V
Line Regulation V
CC
= 12 to 20V; T
j
= 25°C 2.0 10 mV
Load Regulation I
O
= 1 to 10mA; T
j
= 25°C 2.0 10 mV
T
S
Temperature Stability 0.4 mV/°C
Total Variation Line, Load, Temperature 4.80 5.0 5.130 V
I
OS
Short Circuit Current Vref = 0V 30 150 mA
Power Down/UVLO V
CC
= 6V; I
sink
= 0.5mA 0.2 0.5 V
OSCILLATOR SECTION
Initial Accuracy pin 15 = Vref; T
j
= 25°C; V
comp
= 4.5V 95 100 105 kHz
pin 15 = Vref; V
CC
= 12 to 20V
V
comp
= 4.5V
93 100 107 kHz
pin 15 = Vref; V
CC
= 12 to 20V
V
comp
= 2V
46.5 50 53.5 kHz
Duty Cycle pin 3 = 0,7V, pin 15 = V
REF
pin 3 = 0.7V, pin 15 = OPEN
0
0
%
%
pin 3 = 3.2V, pin 15 = V
REF
pin 3 = 3.2V, pin 15 = OPEN
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
ERROR AMPLIFIER SECTION
Input Bias Current V
FB
to GND 0.2 3.0 µA
V
I
Input Voltage V
COMP
= V
FB
2.42 2.5 2.58 V
G
OPL
Open Loop Gain V
COMP
= 2 to 4V 60 90 dB
SVR Supply Voltage Rejection V
CC
= 12 to 20V 85 dB
V
OL
Output Low Voltage I
sink
= 2mA 1.1 V
V
OH
Output High Voltage I
source
= 0.5mA, V
FB
= 2.3V 5 6 V
I
O
Output Source Current V
COMP
> 4V, V
FB
= 2.3V 0.5 1.3 2.5 mA
Output Sink Current V
COMP
= 1.1V, V
FB
= 2.7V 2 6 mA
Unit Gain Bandwidth 1.7 4 MHz
S
R
Slew Rate 8 V/µs
PWM CURRENT SENSE SECTION
I
b
Input Bias Current I
sen
= 0 3 15 µA
I
S
Maximum Input Signal V
COMP
= 5V 0.92 1.0 1.08 V
Delay to Output 70 100 ns
Gain 2.85 3 3.15 V/V
V
t
Fault Threshold Voltage 1.1 1.2 1.3 V
SOFT START SECTION
I
SSC
SS Charge Current T
j
= 25°C 142026µA
I
SSD
SS Discharge Current VSS = 0.6V T
j
= 25°C 5 10 15 µA
V
SSSAT
SS Saturation Voltage DC = 0% 0.6 V
V
SSCLAMP
SS Clamp Voltage 7 V
LEADING EDGE BLANKING
Internal Masking Time 100 ns
OUTPUT SECTION
V
OL
Output Low Voltage I
O
= 250mA 1.0 V
V
OH
Output High Voltage I
O
= 20mA; V
CC
= 12V 10 10.5 V
I
O
= 200mA; V
CC
= 12V 9 10 V
V
OUT CLAMP
Output Clamp Voltage I
O
= 5mA; V
CC
= 20V 13 V
Collector Leakage V
CC
= 20V V
C
= 24V 2 20 µA
(*) R
T
= R
A
//R
B
, R
A
= R
B
= 27k
Ω
, see Fig. 23.
L5991 - L5991A
3/23
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P23

L5991AD13TR

Mfr. #:
Buy L5991AD13TR
Manufacturer:
STMicroelectronics
Description:
Switching Controllers Prog Current Mode
Lifecycle:
New from this manufacturer.
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