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L5991 Datasheet(PDF) 3 Page - STMicroelectronics

Part No. L5991
Description  PRIMARY CONTROLLER WITH STANDBY
Download  23 Pages
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Maker  STMICROELECTRONICS [STMicroelectronics]
Homepage  http://www.st.com
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L5991 Datasheet(HTML) 3 Page - STMicroelectronics

 
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ELECTRICAL CHARACTERISTICS (VCC = 15V; Tj = 0 to 105
°C; RT = 13.3kΩ (*) CT = 1nF;
unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
REFERENCE SECTION
VREF
Output Voltage
Tj = 25
°C; IO = 1mA
4.925
5.0
5.075
V
Line Regulation
VCC = 12 to 20V; Tj = 25°C
2.0
10
mV
Load Regulation
IO = 1 to 10mA; Tj = 25°C
2.0
10
mV
TS
Temperature Stability
0.4
mV/
°C
Total Variation
Line, Load, Temperature
4.80
5.0
5.130
V
IOS
Short Circuit Current
Vref = 0V
30
150
mA
Power Down/UVLO
VCC = 6V; Isink = 0.5mA
0.2
0.5
V
OSCILLATOR SECTION
Initial Accuracy
pin 15 = Vref; Tj = 25°C; Vcomp = 4.5V
95
100
105
kHz
pin 15 = Vref; VCC = 12 to 20V
Vcomp = 4.5V
93
100
107
kHz
pin 15 = Vref; VCC = 12 to 20V
Vcomp = 2V
46.5
50
53.5
kHz
Duty Cycle
pin 3 = 0,7V, pin 15 = VREF
pin 3 = 0.7V, pin 15 = OPEN
0
0
%
%
pin 3 = 3.2V, pin 15 = VREF
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
VFB to GND
0.2
3.0
µA
VI
Input Voltage
VCOMP = VFB
2.42
2.5
2.58
V
GOPL
Open Loop Gain
VCOMP = 2 to 4V
60
90
dB
SVR
Supply Voltage Rejection
VCC = 12 to 20V
85
dB
VOL
Output Low Voltage
Isink = 2mA
1.1
V
VOH
Output High Voltage
Isource = 0.5mA, VFB = 2.3V
5
6
V
IO
Output Source Current
VCOMP > 4V, VFB = 2.3V
0.5
1.3
2.5
mA
Output Sink Current
VCOMP = 1.1V, VFB = 2.7V
2
6
mA
Unit Gain Bandwidth
1.7
4
MHz
SR
Slew Rate
8
V/
µs
PWM CURRENT SENSE SECTION
Ib
Input Bias Current
Isen = 0
3
15
µA
IS
Maximum Input Signal
VCOMP = 5V
0.92
1.0
1.08
V
Delay to Output
70
100
ns
Gain
2.85
3
3.15
V/V
Vt
Fault Threshold Voltage
1.1
1.2
1.3
V
SOFT START SECTION
ISSC
SS Charge Current
Tj = 25
°C
142026
µA
ISSD
SS Discharge Current
VSS = 0.6V Tj = 25
°C
5
10
15
µA
VSSSAT
SS Saturation Voltage
DC = 0%
0.6
V
VSSCLAMP
SS Clamp Voltage
7
V
LEADING EDGE BLANKING
Internal Masking Time
100
ns
OUTPUT SECTION
VOL
Output Low Voltage
IO = 250mA
1.0
V
VOH
Output High Voltage
IO = 20mA; VCC = 12V
10
10.5
V
IO = 200mA; VCC = 12V
9
10
V
VOUT CLAMP
Output Clamp Voltage
IO = 5mA; VCC = 20V
13
V
Collector Leakage
VCC = 20V VC = 24V
2
20
µA
(*) RT = RA//RB, RA = RB = 27k
Ω, see Fig. 23.
L5991 - L5991A
3/23


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