lm5027asqx National Semiconductor Corporation, lm5027asqx Datasheet - Page 6

• Manufacturer Part Number: lm5027asqx
• Description: Lm5027a Voltage Mode Active Clamp Controller
• Manufacturer: National Semiconductor Corporation

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Symbol
OSCILLATOR
PWM COMPARATORS
CURRENT LIMIT RESTART (RES Pin)
CURRENT LIMIT
CS prop
VOLTAGE FEED-FORWARD (RAMP Pin)
VOLT-SECOND CLAMP
OUTA GATE DRIVER
VOL
VOH
IOHL
IOLL
OUTB GATE DRIVER
VOL
VOH
IOHL
IOLL
Frequency1
Sync Threshold
Sync Pulse Width
Delay to Output
COMP to PWM Offset
Duty Cycle Maximum
RES Threshold
Charge Source Current Level 1 V
Charge Source Current Level 2 4.0V < VRES > 1.0V
Discharge Current Source
Ratio of RES Threshold to SS
Low
Cycle by cycle sense voltage
threshold
Current limit propagation delay CS step from 0 to 0.6V time to onset of OUTA
RAMP Discharge Device
Ramp Clamp Level
OUTA Low-state Output Voltage I
OUTA High-state Output
Voltage
OUTA Rise Time
OUTA Fall Time
Peak OUTA Source Current
Peak OUTA Sink Current
OUTB Low-state Output Voltage I
OUTB High-state Output
Voltage
OUTB Rise Time
OUTB High Side Fall Time
Peak OUTB Source Current
Peak OUTB Sink Current
Parameter
RT = 38.4 kΩ
OUTA, OUT_A = Tdelay_min
V
V
RAMP = 0
transition (90%) Cgate = 0pen
R
Delta RAMP measured from onset of OUTA
to Ramp peak. Comp = 5V
I
C-load = 1000 pF
C-load = 1000 pF
V
V
I
C-load = 1000 pF
C-load = 1000 pF
V
V
OUTA
OUTA
OUTB
OUTB
RES
RES
RES
OUTA
OUTA
OUTB
OUTB
DS(ON)
< 1.0V
ramping down
> 1V, Hiccup counter
= 100 mA
= -100 mA, VOHL = VCC -VLO
= 100 mA
= -100 mA, VOHL = VCC -VLO
= 0V (VCC = 10V)
= VCC= 10V
= 0V (VCC = 10V)
= VCC= 10V
Conditions
6
0.35
Min
275
450
2.3
0.5
15
70
4
4
2.85
72.5
0.15
0.21
0.31
Typ
310
125
500
1.0
1.1
5.0
2.5
0.2
50
22
30
10
13
15
13
5
5
2
2
1
1
Max
345
150
550
6.5
2.6
0.5
0.4
75
26
7
Units
kHz
mV
µA
µA
µA
ns
ns
ns
ns
ns
ns
ns
%
Ω
V
V
V
V
V
V
A
A
V
V
A
A