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PDF LD7120A Data sheet ( Hoja de datos )

Número de pieza LD7120A
Descripción Single Synchronous Buck PWM Controller
Fabricantes Leadtrend 
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LD7120A
12/14/2006
REV:00
Single Synchronous Buck PWM Controller
General Description
The LD7120A 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 LD7120A 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 LD7120A 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
1
BOOT
OCSET
2
UGATE
LD7120A
8
PHASE
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
LD7120A-DS-00 December 2006
R5
62 ohm
C11
18nF
R7
0 ohm
1
Vout
C2 C3 C4
470uF 470uF 0.1uF

1 page




LD7120A pdf
Typical Performance Characteristics
LD7120A
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
LD7120A-DS-00 December 2006
IOUT
Fig. 6 Load Transient
5

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