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LM5021 数据表(PDF) 4 Page - Texas Instruments

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部件名 LM5021
功能描述  LM5021 AC-DC Current Mode PWM Controller
PDF  23 Pages
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

LM5021 数据表(HTML) 4 Page - Texas Instruments

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LM5021
SNVS359D – MAY 2005 – REVISED MARCH 2013
www.ti.com
Electrical Characteristics
(1) (continued)
Specifications in standard type face are for TJ= +25°C and those in boldface type apply over the full Operating Junction
Temperature Range. Unless otherwise specified: VIN = 15V, RT = 44.2KΩ.
Symbol
Parameter
Conditions
Min
Typ
Max
Unit
SOFT-START
VSS-OCV
SS pin open-circuit voltage
4.3
5.2
6.1
V
Soft-start Current Source
15
22
30
µA
Soft-start to COMP Offset
0.35
0.55
0.75
V
COMP sinking impedance
During SS ramp
60
Ω
OSCILLATOR
Frequency1 (RT = 44.2K)
135
150
165
kHz
Frequency2 (RT = 13.3K)
440
500
560
kHz
Sync threshold
2.4
3.2
3.8
V
PWM COMPARATOR
COMP to OUT delay
COMP set to 2V
20
ns
CS stepped 0 to 0.4V,
time to OUT transition
low, Cload = 0.
Min Duty Cycle
COMP = 0V
0
%
Max Duty Cycle (-1 Device)
75
80
85
%
Max Duty Cycle (-2 Device)
50
%
COMP to PWM comparator gain
0.33
COMP Open Circuit Voltage
4.2
5.1
6
V
COMP at Max Duty Cycle
2.75
V
COMP Short Circuit Current
COMP = 0V
0.6
1.1
1.5
mA
SLOPE COMPENSATION
Slope Comp Amplitude (LM5021-1
CS pin to PWM
70
90
110
mV
only)
Comparator offset at
maximum duty cycle
OUTPUT SECTION
OUT High Saturation
IOUT = 50mA, VCC -
0.6
1.1
V
OUT
OUT Low Saturation
IOUT = 100mA
0.3
1
V
Peak Source Current
OUT = VCC/2.
0.3
A
Peak Sink Current
OUT = VCC/2.
0.7
A
Rise time
Cload = 1nF
25
ns
Fall time
Cload = 1nF
10
ns
HICCUP MODE
VOVLD
Over load detection threshold
COMP pin
VSS-OCV – 0.8
VSS-OCV – 0.6
VSS-OCV– 0.4
V
VHIC
Hiccup mode threshold
SS pin
VSS-OCV – 0.8
VSS-OCV – 0.6
VSS-OCV– 0.4
V
VRST
Hiccup mode Restart threshold
SS pin
0.1
0.3
0.5
V
IDTCS
Dead-time current source
0.1
0.25
0.4
µA
IOVCS
Overload detection timer current
6
10
14
µA
source
THERMAL RESISTANCE
θJA
VSSOP-8 Junction to Ambient
0 LFM
200
°C/W
θJA
PDIP-8 Junction to Ambient
0 LFM
107
°C/W
4
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Copyright © 2005–2013, Texas Instruments Incorporated
Product Folder Links: LM5021



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