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PDF LW4933 Data sheet ( Hoja de datos )
| Número de pieza | LW4933 | |
| Descripción | POWER SUPPLY SUPERVISOR | |
| Fabricantes | ETC | |
| Logotipo |  |
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LW4933
POWER SUPPLY SUPERVISOR WITH PWM CONTROLLER
Description
The LW4933 is designed with a pulse-width-modulation control circuit and
a complete power supervisor for use in the switched mode power supply .
It contains various functions, like under voltage protection (UVP), over
voltage protection (OVP), power good output (PG) and ON/OFF control
(REM).
UVP(Under voltage protection) function is for +3.3V, +5V, +12V outputs.
OVP(Over voltage protection) function is for +3.3V, +5V, +12V and PT is for
extra protection input.
PG(Power good signal) is a safe operation signal to inform the external
parts.
REM(Remote on/off) is used to control the SMPS on/off. The REM control
signal has the on/off transferred debounce–time.
PIN CONFIGURATION (Top View)
FEATURE
■ 3-channel under voltage protection (UVP)
■ 3-channel over voltage protection (OVP)
■ 1-channel extra protection (PT)
■ 1-channel sense input to control the PG (SEN)
■ Remote on/off control function (REM)
■ Dual output for push-pull operation (OP1/OP2)
■ Soft start capability by external capacitor (SS)
■ VCC under voltage lockout
■ 16-Pin dual in-line package
■ Pb-free Package are available
ORDERING INFORMATION
ORDER NUMBER
LW4933
Package
DIP-16 (Pb-free)
Shipping
Tube
Top Marking
LW4933
REFERENCE APPLICATION CIRCUIT
datasheet Rev.A1.0
1
1 page  
LW4933D/ LW4933S
POWER SUPPLY SUPERVISOR WITH PWM CONTROLLER
APPLICATION HINTS
1. Input Impedence
Pin Name
V33
V5
V12
PT
Input Impedence
52KΩ
81KΩ
52KΩ
Pull-high to VCC= 24 KΩ
Pull-low to GND=4.7 KΩ
2. Soft Start
3. PWM Frequency
Tpwm= K2 · RT
K2 = 1.3·10-10
Example.
RT = 100KΩ
Tpwm = (1.33·10-10) · (100 ·103 ) = 13.3us
Fpwm = 75KHz
4.PT
PT Voltage Level
PT>1.25V
PT<0.62V
Function
Over voltage protection
Disable under voltage check function
5.REM
In some application circuits, adding a resistor in series with the REM pin could reduce the noise spike and avoid
the pin from damage.
datasheet Rev.A1.0
5
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet LW4933.PDF ] | |
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