http://www.www.datasheet4u.com

900,000+ Datasheet PDF Search and Download

Datasheet4U offers most rated semiconductors datasheets pdf




STMicroelectronics Electronic Components Datasheet

L5991D Datasheet

PRIMARY CONTROLLER WITH STANDBY

No Preview Available !

L5991D pdf
L5991
® L5991A
PRIMARY CONTROLLER WITH STANDBY
CURRENT-MODE CONTROL PWM
SWITCHING FREQUENCY UP TO 1MHz
LOW START-UP CURRENT (< 120µA)
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
BLOCK DIAGRAM
MULTIPOWER BCD TECHNOLOGY
DIP16
SO16
ORDERING NUMBERS: L5991/L5991A (DIP16)
L5991D/L5991AD (SO16)
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.
2
RCT
3
DC
+
-
14
DIS
-
+
2.5V
DIS
ISEN
SS
OVER CURRENT
13
+
-
1.2V
7
1V
SYNC
1
TIMING
T
DC-LIM
15
VCC
8
25V
15V/10V
+
-
Vref
PWM UVLO
VREF
4
9
VC
BLANKING
PWM
FAULT
SOFT-START
2R
R
12
SGND
SQ
R
VREF OK
CLK
DIS
6
COMP
13V 10
OUT
VREF
STAND-BY
+ 2.5V
E/A
-
11
PGND
16
ST-BY
5
VFB
D97IN725A
August 1999
1/23


STMicroelectronics Electronic Components Datasheet

L5991D Datasheet

PRIMARY CONTROLLER WITH STANDBY

No Preview Available !

L5991D pdf
L5991 - L5991A
ABSOLUTE MAXIMUM RATINGS
Symbol
VCC
IOUT
Ptot
Tj
Tstg
Parameter
Supply Voltage (ICC < 50mA) (*)
Output Peak Pulse Current
Analog Inputs & Outputs (6,7)
Analog Inputs & Outputs (1,2,3,4,5,15,14, 13, 16)
Power Dissipation @ Tamb = 70°C (DIP16)
@ Tamb = 50°C (SO16)
Junction Temperature, Operating Range
Storage Temperature, Operating Range
(*) maximum package power dissipation limits must be observed
PIN CONNECTION
Value
selflimit
1.5
-0.3 to 8
-0.3 to 6
1
0.83
-40 to 150
-55 to 150
Unit
V
A
V
V
W
W
°C
°C
SYNC
RCT
DC
VREF
VFB
COMP
SS
VCC
1
2
3
4
5
6
7
8
16 ST-BY
15 DC-LIM
14 DIS
13 ISEN
12 SGND
11 PGND
10 OUT
9 VC
THERMAL DATA
Symbol
Rth j-amb
Parameter
Thermal Resistance Junction -Ambient (DIP16)
Thermal Resistance Junction -Ambient (SO16)
PIN FUNCTIONS
Value
80
120
Unit
°C/W
°C/W
N. Name
Fun ction
1 SYNC Synchronization. A synchronization pulse terminates the PWM cycle and discharges Ct
2
RCT
Oscillator pin for external CT, RA, RB 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
8 VCC Supply for internal ”Signal” circuitry
9 VC 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.
2/23


Part Number L5991D
Description PRIMARY CONTROLLER WITH STANDBY
Maker STMicroelectronics
Total Page 19 Pages
PDF Download
L5991D pdf
Download PDF File
L5991D pdf
View for Mobile






Related Datasheet

1 L5991 PRIMARY CONTROLLER WITH STANDBY STMicroelectronics
STMicroelectronics
L5991 pdf
2 L5991A PRIMARY CONTROLLER WITH STANDBY STMicroelectronics
STMicroelectronics
L5991A pdf
3 L5991AD PRIMARY CONTROLLER WITH STANDBY STMicroelectronics
STMicroelectronics
L5991AD pdf
4 L5991D PRIMARY CONTROLLER WITH STANDBY STMicroelectronics
STMicroelectronics
L5991D pdf




Part Number Start With

0    1    2    3    4    5    6    7    8    9    A    B    C    D    E    F    G    H    I    J    K    L    M    N    O    P    Q    R    S    T    U    V    W    X    Y    Z

site map

webmaste! click here

contact us

Buy Components