lm5045sqx National Semiconductor Corporation, lm5045sqx Datasheet - Page 7

• Manufacturer Part Number: lm5045sqx
• Description: Full-bridge Pwm Controller With Integrated Mosfet Drivers
• Manufacturer: National Semiconductor Corporation

Current Sense Input (CS Pin)
Soft-Stop Disable (SS OFF Pin)
Current Limit Restart (RES Pin)
Voltage Feed-Forward (RAMP Pin)
Oscillator (RT Pin)
Synchronous Rectifier Timing Control (RD1 & RD2 Pins)
I
I
I
I
Symbol
I
I
SSSR-DIS1
SSSR-DIS2
RES-SRC1
RES-SRC2
V
RES-DIS2
RES-DIS2
I
R
F
F
V
SSSR
V
R
IH(min)
T1
T2
SW1
SW2
RES
RES
CS
CS
Parameter
SSSR charge current
SSSR discharge current 1
SSSR discharge current 2
SSSR output low voltage
SSSR threshold to enable SR1/SR2
Current limit threshold
CS delay to output
CS leading edge blanking
CS sink impedance (clocked)
SSOFF Input-threshold
SSOFF pull down resistance
RES pull-down resistance
RES hiccup threshold
RES upper counter threshold
RES lower counter threshold
Charge current source 1
Charge current source 2
Discharge current source 1
Discharge current source 2
Ratio of time in hiccup mode to time
in current limit
RAMP sink impedance (Clocked)
Frequency (LO1, half oscillator
frequency)
Frequency (LO1, half oscillator
frequency)
DC level
RT sync threshold
SR trailing edge delay
SR turn-off to HO&LO both on
SR leading edge
HO or LO turn-off to SR turn-on
Conditions
V
V
V
Sinking 100µA
Internal FET sink impedance
Termination of hiccup timer
V
1V<V
V
2V<V
V
R
R
R
R
R
R
SS
UVLO
RES
RES
CS
RES
T
T
D1
D1
D2
D2
= 25 kΩ
= 10 kΩ
>2V, I
=20 kΩ
=100 kΩ
=20 kΩ
=100 kΩ
<750mV
>1V
<1V,V
>1V, Hiccup counter
RES
RES
<1.25V
<4V
<4V
COMP
CS
7
>750mV
<800µA
0.710
Min
109
185
420
232
227
2.8
16
54
45
43
0.750
Typ
125
200
147
200
480
300
300
1.2
2.8
5.5
2.0
20
65
50
65
50
18
37
30
10
65
65
1
4
2
5
5
3
0.785
Max
147
215
540
388
384
3.3
24
75
45
20
90
90
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Units
kHz
kHz
mV
kΩ
µA
µA
µA
µA
µA
µA
µA
ns
ns
ns
ns
ns
ns
Ω
Ω
Ω
V
V
V
V
V
V
V
V