lm5039mhx National Semiconductor Corporation, lm5039mhx Datasheet - Page 6

• Manufacturer Part Number: lm5039mhx
• Description: Half-bridge Pwm Controller With Average Current Limit
• Manufacturer: National Semiconductor Corporation

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Soft-Start (SS Pin)
Oscillator (RT Pin)
PWM Controller (Comp Pin)
Main Output Drivers (HO and LO Pins)
Voltage Feed-Forward (RAMP Pin)
Synchronous Rectifier Drivers (SR1, SR2)
V
Symbol
F
PWM-OS
Foldback
F
F
I
T1
T2
SW1
SW2
SS
Parameter
Charging current in normal
operation
Charging current during a hiccup
mode restart
Frequency 1(at HO, half oscillator
frequency)
Frequency 2 (at HO, half oscillator
frequency)
Foldback frequency in current limit
DC level
Input Sync threshold
Delay to output
SS to RAMP offset
Minimum duty cycle
Small signal impedance
Output high voltage
Output low voltage
Rise time
Fall time
Peak source current
Peak sink current
HB Threshold
RAMP comparator threshold
Output high voltage
Output low voltage
Rise time
Fall time
Peak source current
Peak sink current
Deadtime, SR1 falling to HO rising,
SR2 falling to LO rising
Deadtime, HO falling to SR1 rising,
LO falling to SR2 rising
Conditions
V
V
R
R
R
I
SS = 0V
I
voltage
I
I
C
C
V
V
V
COMP current = 0
I
I
C
C
V
V
R
R
R
R
R
R
ACL
COMP
OUT
OUT
OUT
OUT
SS
SS
HO,LO
HO,LO
CC
SR
SR
RT
RT
RT
LOAD
LOAD
LOAD
LOAD
DLY
DLY
DLY
DLY
DLY
DLY
>35 µA
= 0
= 0
= 25 kΩ
= 8.76 kΩ
= 25 kΩ, 0.570<V
rising
= 0, V
= V
= 50mA, V
= 100 mA
= 10mA, V
= 20 mA (sink)
= 10k
= 27.4k
= 100k
= 10k
= 27.4k
= 100k
= 400µA, COMP current to PWM
= 1 nF
= 1 nF
= 1 nF
= 1 nF
= 0V, V
= 10V, V
VCC
VCC
, V
6
VCC
= 10V
VCC
HB
VCC
VCC
= 10V
- V
= 10V
- V
= 10V
HO
CS
SR1
, V
> 0.525
, V
VCC
VCC
- V
- V
LO
SR2
0.25
Min
180
430
0.6
2.5
0.7
0.5
2.0
80
65
20
6000
66.7
0.25
1.25
0.07
Typ
110
200
500
110
300
1.2
0.2
3.8
2.2
0.1
0.5
0.5
15
13
40
20
33
88
12
29
80
2
3
1
2
Max
140
220
570
118
1.8
3.4
1.2
0.5
2.4
0.2
42
0
Units
kHz
kHz
µA
µA
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
%
Ω
V
V
V
V
V
A
A
V
V
V
V
A
A