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부품번호 | LM5037 기능 |
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기능 | Dual-Mode PWM Controller | ||
제조업체 | National Semiconductor | ||
로고 | |||
전체 24 페이지수
December 12, 2008
www.DataSheet4U.com
LM5037
Dual-Mode PWM Controller With Alternating Outputs
General Description
The LM5037 PWM controller contains all the features neces-
sary to implement balanced double-ended power converter
topologies, such as push-pull, half-bridge and full-bridge.
These double-ended topologies allow for higher efficiencies
and greater power densities compared to common single-
ended topologies such as the flyback and forward. The
LM5037 can be configured for either voltage mode or current
mode control with minimum external components. Two alter-
nating gate drive outputs are provided, each capable of 1.2A
peak output current. The LM5037 can be configured to oper-
ate directly from the input voltage rail over a wide range of
13V to 100V. Additional features include programmable max-
imum duty cycle limit, line under-voltage lockout, cycle-by-
cycle current limit and a hiccup mode fault protection with
adjustable timeout delay, soft-start and a 2 MHz capable os-
cillator with synchronization capability, precision reference
and thermal shutdown.
Features
■ High voltage (100V) start-up regulator
■ Alternating outputs for double-ended topologies
■ Current-mode or feed-forward voltage-mode control
■ Programmable maximum duty cycle lLimit
■ 2% feedback reference accuracy
■ High gain-bandwidth error amplifier
■ Programmable line under-voltage lockout (UVLO) with
adjustable hysteresis
■ Versatile dual mode over-current protection with hiccup
delay timer
■ Programmable soft-start
■ Precision 5V reference output
■ Current sense leading edge blanking
■ Resistor programmed 2 MHz capable oscillator
■ Oscillator synchronization capability with low frequency
lockout protection
Package
■ TSSOP-16
Simplified Push-Pull Power Converter
© 2008 National Semiconductor Corporation 300694
30069401
www.national.com
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
VIN to GND
-0.3V to 105V
VCC, OUTA, OUTB to GND
-0.3V to 16V
CS to GND
-0.3V to 1.0V
UVLO, FB, RT2, RT1, RAMP, SS, REF to -0.3V to 7V
GND
COMP, RES (Note 3)
ESD Rating
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Human Body Model
2kV
Storage Temperature Range
−65°C to + 150°C
Junction Temperature
150°C
Operating Ratings
VIN Voltage
External Voltage Applied to VCC
Operation Junction Temperature
13V to 100V
8V to 15V
−40°C to + 125°C
Electrical Characteristics Specifications with standard typeface are for TJ = 25°C, and those with boldface type
apply over full Operating Junction Temperature range. VVIN = 48V, VVCC = 10V, RRT1 = 30.1 kΩ, RRT2 = 30.1 kΩ, VUVLO = 3V
unless otherwise stated.
Symbol
Parameter
Startup Regulator (VCC Pin)
VVCC
IVCC(Lim)
VVCC(UV)
VCC voltage
VCC current limit
VCC Under-voltage threshold
IVCC = 10 mA
VVCC = 7V
VVIN = VVCC
Conditions
Hysteresis
IVIN Startup regulator current
VVIN = 100V, VUVLO = 0V
VVIN = 48V, VUVLO = 0V
Supply current into VCC from Outputs & COMP = Open
external source
Voltage Reference Regulator (REF Pin)
VREF
IREF(Lim)
REF Voltage
IREF = 0 mA
REF Voltage Regulation
IREF = 0 to 2.5 mA
REF Current Limit
VREF = 4.5V
VREF Under-Voltage Threshold
VREF(UV) Hysteresis
Under-Voltage Lock Out and Shutdown (UVLO Pin)
VUVLO
IUVLO
Under-voltage threshold
Hysteresis current
Under-voltage Shutdown
Threshold
UVLO pin sinking
UVLO voltage rising
Hysteresis
Current Sense Input (CS Pin)
VCS Current Limit Threshold
CS delay to output
CS from zero to 1V. Time for OUTA and OUTB
to fall to 90% of VCC. Output load = 0 pF.
Leading edge blanking time at
CS
CS sink impedance (clocked) Internal FET sink impedance
Current Limit Restart (RES Pin)
VRES
RES Threshold
Charge source current
Discharge sink current
Soft-Start (SS Pin)
VRES = 1.5V
VRES = 1V
ISS Charging current in normal
operation
VSS = 0
Charging current during a hiccup VSS = 0
mode restart
Min
7.4
45
VCC
Reg-0.2
4.75
5
3.7
1.20
18
0.37
0.22
1.9
14
5
70
0.6
Typ Max Units
7.7
60
VCC
Reg-0.1
1.5
350
325
3
8
430
370
5.5
V
mA
V
V
µA
µA
mA
5 5.15 V
7 25 mV
10 mA
4 4.3 V
0.35 V
1.25 1.295 V
22 25 µA
0.42 0.47 V
0.1 V
0.25 0.29 V
27 ns
65 ns
21 45 Ω
2 2.2 V
18 22 µA
8 11 µA
100 130 µA
1 1.4 µA
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4
4페이지 Oscillator Frequency vs RT1
Dead-Time vs RT2 www.DataSheet4U.com
VFB vs Temperature
30069408
30069410
Oscillator Frequency vs Temperature
30069411
Dead-Time vs Temperature
30069412
Soft-Start and Restart Current vs Temperature
30069413
7
30069414
www.national.com
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