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PDF LD7120 Data sheet ( Hoja de datos )
| Número de pieza | LD7120 | |
| Descripción | Single Synchronous Buck PWM Controller | |
| Fabricantes | Leadtrend | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LD7120 (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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LD7120
2/21/2005
Single Synchronous Buck PWM Controller
General Description
The LD7120 is a single PWM controller designed to drive
N-channel MOSFET in a synchronous buck topology. The IC
integrates the controller, output adjustment, monitoring, and
protection functions in a single 8-pin package.
The LD7120 provides simple, single feedback loop, voltage
mode controller with fast transient response. Internal 0.8V
temperature-compensated reference voltage is designed to
meet low output voltage for further applications. A fixed
300KHz frequency oscillator reduces design complexity,
while balancing typical application cost and efficiency.
The LD7120 features over current protection. The output
current is monitored by sensing the voltage drop across the
MOSFET RDS(ON), which eliminates the need for a current
sensing resistor.
Features
• Operates from 5V
• Drives Two N-channel MOSFETs
• Fixed 300KHz Constant Switching Frequency
• Full 0~100% Duty-cycle
• Programmable Over Current Protection
• Internal Soft-start
• Fast Transient Response
• Under-voltage Lockout
Applications
• Motherboard
• Graphic Cards
• 5V Input DC/DC Converter
• Memory Supplies
• Cable Modem, Set Top Box and DSL Modems
• DSP and Core Communications Processor Supplies
Typical Application
Vin= 5V
R3
6.19K
R2
10K
C10
8.2nF
R1
1K
C12
0.1uF
C7
1uF
C5 C6
330uF 330uF
5
7
C9
470pF
6
VCC
BOOT
OCSET
UGATE
LD7120
PHASE
1
2
8
FB
4
LGATE
GND
3
Q1
Q2
C8
1uF
D1
CH551H-30
C1
0.1uF
L1 2uH
R6
NC
R4
2.15K
C13
NC
Leadtrend Technology Corporation
LD7120-DS-05 February 2005
R5
62 ohm
C11
18nF
1
R7
0 ohm
Vout
C2 C3 C4
470uF 470uF 0.1uF
Free Datasheet http://www.Datasheet4U.com
1 page  
Typical Performance Characteristics
LD7120
UGATE
LGATE
Fig. 1 Dead Time
VIN
VOUT
Fig. 3 Power ON
VOUT
UGATE
LGATE
Fig. 2 Dead Time
VIN
VOUT
Fig. 4 Power Off
VOUT
IOUT
Fig. 5 Load Transient
Leadtrend Technology Corporation
LD7120-DS-05 February 2005
IOUT
Fig. 6 Load Transient
5
Free Datasheet http://www.Datasheet4U.com
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LD7120.PDF ] | |
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