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L4990AD 数据表(PDF) 3 Page - STMicroelectronics

部件名 L4990AD
功能描述  PRIMARY CONTROLLER
PDF  24 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L4990AD 数据表(HTML) 3 Page - STMicroelectronics

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ELECTRICAL CHARACTERISTICS (VCC = 15V; Tj = 0 to 70
°C; unless otherwise specified.)
Symbol
Parameter
Test Condition
Min.
Typ.
Max.
Unit
REFERENCE SECTION
VO
Output Voltage
Tj =25
°C; IO = 1mA
4.925
5.0
5.075
V
Line Regulation
VCC = 12 to 20V
2.0
15
mV
Load Regulation
IO = 1 to 20mA
5.0
20
mV
TS
Temperature Stability
0.4
mV/
°C
Total Variation
Line, Load, Temperature
4.875
5.0
5.125
V
IOS
Short Circuit Current
Vref = 0V
30
150
mA
Power Down/UVLO
VCC = 8.5V; Isink = 0.5mA
0.2
0.5
V
OSCILLATOR SECTION
Initial Accuracy
Tj =25
°C; RT = 4.42kΩ;
CT = 1nF; pin 15 Vref
285
300
315
kHz
Accuracy
RT = 4.42K
Ω;VCC = 12 to 20V;
CT = 1nF; pin 15 = Vref
279
300
321
kHz
Initial Accuracy
Tj =25
°C; RT = 4.42KΩ;
CT = 1nF; pin 15 OPEN
280
295
310
kHz
Accuracy
RT = 4.42K
Ω;VCC = 12 to 20V;
CT = 1nF; pin 15 OPEN
275
295
315
kHz
Duty Cycle
pin 3 = 0,7V, pin 15 = Vref
pin 3 = 0.7V, pin 15 = OPEN
0
0
%
%
Duty Cycle
RT = 4.42k
Ω CT = 1nF
pin 3 = 3.2V, pin 15 = Vref
pin 3 = 3.2V, pin 15 = OPEN
45
90
%
%
Duty Cycle Accuracy
pin 3 = 2.02V, pin 15 = OPEN
37
40
43
%
Oscillator Ramp Peak
3.0
V
Oscillator Ramp Valley
1.0
V
ERROR AMPLIFIER SECTION
Input Bias Current
VFB to GND
0.2
1.0
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, VFB = 2.7V
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
mA
Output Sink Current
VCOMP = 1.1V, VFB = 2.7V
2
6
mA
Unit Gain Bandwidth
2
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
100
ns
Gain
2.85
3
3.15
V/V
SOFT START
ISSC
SS Charge Current
14
20
26
µA
ISSD
SS Discharge Current
VSS = 0.6V
200
µA
VSSSAT
SS Saturation Voltage
DC = 0%
0.6
V
VSSCLAMP
SS Clamp Voltage
7
V
LEADING EDGE BLANKING
Internal Masking Time
100
ns
L4990 - L4990A
3/24



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