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What is L5991AD?

This electronic component, produced by the manufacturer "STMicroelectronics", performs the same function as "PRIMARY CONTROLLER WITH STANDBY".


L5991AD Datasheet PDF - STMicroelectronics

Part Number L5991AD
Description PRIMARY CONTROLLER WITH STANDBY
Manufacturers STMicroelectronics 
Logo STMicroelectronics Logo 


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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

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L5991AD equivalent
L5991 - L5991A
Figure 3. Quiescent current vs. input voltage.
Iq [m A]
9 .0
8 .5
8 .0
V 14 = 0, V5 = V ref
R t = 4.5Koh m ,Tj = 25 °C
1M hz
500Khz
300Khz
100Khz
7 .5
7 .0
8
10 12 14 16 18 20 22 24
Vc c [V ]
Figure 5. Quiescent current vs. input voltage
and switching frequency.
Iq [mA]
36
Co= 1nF, Tj = 25°C
30
DC = 100%
24 1MHz
18 500KHz
300KHz
12
100KHz
6
0
8 10 12 14 16 18 20
Vcc [V]
Figure 7. Vref vs. junction temperature.
22
Vref [V])
5.1
5.05
5
Vcc = 15V
Iref = 1mA
Figure 4. Quiescent current vs. input voltage
and switching frequency.
Iq [mA]
36
3 0 C o = 1 n F, T j = 2 5 °C
DC = 0%
24
18
12
6
1M Hz
500KHz
300K Hz
100K Hz
0
8 10 12 14 16 18 20 22
Vcc [V]
Figure 6. Reference voltage vs. load current.
Vref [V]
5.1
5.05
5
Vcc=15V
Tj = 25°C
4.95
4.9
0
5 10 15 20
Iref [mA]
Figure 8. Vref vs. junction temperature.
Vref [V]
5.1
5.05
Vcc = 15V
Iref= 20mA
25
5
4.95
4.95
4.9
-50 -25 0
25 50 75 100 125 150
Tj (°C)
4.9
-50 -25 0 25 50 75 100 125 150
Tj (°C)
5/23


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Part Details

On this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for L5991AD electronic component.


Information Total 19 Pages
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Featured Datasheets

Part NumberDescriptionMFRS
L5991AThe function is PRIMARY CONTROLLER WITH STANDBY. STMicroelectronicsSTMicroelectronics
L5991ADThe function is PRIMARY CONTROLLER WITH STANDBY. STMicroelectronicsSTMicroelectronics

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