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PDF LM5171 Data sheet ( Hoja de datos )
| Número de pieza | LM5171 | |
| Descripción | Boost Regulator | |
| Fabricantes | HTC | |
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1.5A, 280kHz, Boost Regulator
LM5171
FEATURES
• Integrated Power Switch 1.5A Guaranteed
• Wide Input Voltage Range 2.7V to 30V
• High Frequency Allows for Small Components
• Minimum External Components
• Easy External Synchronization
• Frequency Foldback Reduces Component
Stress During an Overcurrent Condition
• Thermal Shutdown with Hysteresis
• Shutdown Current is 50 uA Maximum
• Wide Ambient Temperature Range
• Moisture Sensitivity Level 3
APPLICATION
• LCD Monitor/TV LED Backlight Driver
• TFT-LCD Power Management
SOP-8 PKG
ORDERING INFORMATION
Device
LM5171D
Package
SOP-8
DESCRIPSION
The LM5171 product is 280kHz switching regulator with a high efficiency, 1.5A integrated switch. This part
operates over a wide input voltage range, from 2.7V to 30V. The flexibility of the design allows the chip to
operate in most power supply configurations, including boost, flyback, forward, inverting, and SEPIC.
This IC utilizes current mode architecture, which allows excellent load and line regulation, as well as a practical
means for limiting current. Combining high frequency operation with a highly integrated regulator circuit results
in an extremely compact power supply solution. The circuit design includes provisions for features such as
frequency synchronization, shutdown, and feedback control.
ABSOLUTE MAXIMUM RATINGS
RATING
SYMBOL
VALUE
UNIT
Junction Temperature Range
TJ
-40 to 125
℃
Storage Temperature Range
Tstg
-65 to 150
℃
Thermal Resistance, Junction to Ambient
RθJA
165 ℃/W
Thermal Resistance, Junction to Case
Lead Temperature (Soldering, 10 sec) (Note 1)
RθJC
-
45 ℃/W
230 ℃
Note 1. 60 second maximum above 183°C.
* Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Maximum ratings applied to the device are
individual stress limit value and are not valid simultaneously. If the limits are exceeded, device functional operation is not implied, damage
may occur and reliability may be affected.
Ordering Information
Package
Order No.
SOP-8
LM5171D
Description
1.5A, 280kHz
Supply As
Reel
Status
Active
Dec. 2010 - Rev. 1.2.1
-1-
HTC
1 page  
1.5A, 280kHz, Boost Regulator
LM5171
ELECTRICAL CHARACTERISTICS (Continued)
2.7V < Vcc < 30 V, 0°C < TJ < 125°C, unless otherwise stated.
Characteristics
Test Condition
Sync / Shutdown
Sync Range
Sync Pulse Transition Threshold
SS Bias Current
Shutdown Threshold
Shutdown Delay
Power Switch
Switch Saturation Voltage
Switch Current Limit
Minimum Pulse Width
∆Icc/∆Ivsw
Rise Time = 20 ns
SS = 0V
SS = 3.0V
2.7V ≤ Vcc ≤ 12V
12V ≤ Vcc ≤ 30V
ISWITCH = 1.5A (Note 2)
ISWITCH = 1.0A, 0°C ≤ TA ≤ 70°C
ISWITCH = 10mA
50% duty cycle (Note 2)
80% duty cycle (Note 2)
FB = 0V, Isw = 4.0A (Note 2)
2.7V ≤ VCC ≤ 12V, 10mA ≤ Isw ≤1.0A
12V ≤ VCC ≤ 30V, 10mA ≤ Isw ≤ 1.0A
2.7V ≤ VCC ≤ 12V,10mA ≤ Isw ≤ 1.5A
(Note2)
12V ≤ VCC ≤ 30V, 10mA≤ Isw ≤ 1.5A
(Note2)
Switch Leakage
General
Operating Current
Shutdown Mode Current
Minimum Operating Input Voltage
Thermal Shutdown
Thermal Hysteresis
Vsw = 40V, Vcc = 0V
Isw = 0
Vc < 0.8V, SS = 0V, 2.7V ≤ Vcc ≤ 12V
Vc < 0.8V, SS = 0V, 12V ≤ Vcc ≤ 30V
Vsw Switching, Maximum Isw = 10mA
(Note 2)
(Note 2)
Note 2. Guaranteed by design, not 100% tested in production.
Min TYP Max Unit
320 - 500 kHz
2.5 - - V
-15 -3
-
uA
- 38
0.50 0.85 1.20
V
12 80 350 us
12 36 200 us
- 0.8 1.4 V
- 0.55 1.00 V
- 0.09 0.45 V
1.6 1.9 2.4
A
1.5 1.7 2.2
A
200 250 300
ns
- 10 30 mA/A
- - 100 mA/A
- 17 30 mA/A
- - 100 mA/A
- 2.0 100 uA
- 5.5 8 mA
- 12 60 uA
- - 100 uA
- 2.45 2.70 V
150 180 210
°C
- 25 - °C
Dec. 2010 - Rev. 1.2.1
-5-
HTC
5 Page 
1.5A, 280kHz, Boost Regulator
LM5171
COMPONENT SELECTION
Frequency Compensation
The goal of frequency compensation is to achieve desirable transient response and DC regulation while
ensuring the stability of the system. A typical compensation network, as shown in Figure 23, provides a
frequency response of two poles and one zero. This frequency response is further illustrated in the Bode plot
shown in Figure 24.
VC
LM5171
AGND
R1
C2
C1
Figure 23. A Typical Compensation Network
The high DC gain in Figure 24 is desirable for achieving DC accuracy over line and load variations. The DC
gain of a transconductance error amplifier can be calculated as follows:
GainDC = Gm × RO
where:
GM = error amplifier transconductance;
RO = error amplifier output resistance ≈ 1 MΩ.
The low frequency pole, fP1, is determined by the error amplifier output resistance and C1 as:
The first zero generated by C1 and R1 is:
f P1
=
1
2πC1RO
f Z1
=
1
2πC1R1
The phase lead provided by this zero ensures that the loop has at least a 45° phase margin at the crossover
frequency. Therefore, this zero should be placed close to the pole generated in the power stage which can be
identified at frequency:
f
p
=
1
2πCO RLOAD
where:
CO = equivalent output capacitance of the error amplifier≈120pF;
RLOAD= load resistance.
Dec. 2010 - Rev. 1.2.1
- 11 -
HTC
11 Page | ||
| Páginas | Total 19 Páginas | |
| PDF Descargar | [ Datasheet LM5171.PDF ] | |
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