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NT3875A fiches techniques PDF

Noveltek - Wide Input Range CC/CV Step Down Converter

Numéro de référence NT3875A
Description Wide Input Range CC/CV Step Down Converter
Fabricant Noveltek 
Logo Noveltek 





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NT3875A fiche technique
Conceptual
NT3875A/B
Wide Input Range CC/CV Step Down Converter
General Description
Features
The NT3875 is a step down PWM converter with driving a
output current up to 2A (NT3875A) a nd 1A (NT3875B)
without a dditional tra nsistor. It is de signed to allow f or
operating a wide supply voltage rnage from 8Vto 40V. The
external shutdown function can be controlled by logic level
to pull COMP/EN pin down, and then comes into standby
mode. The external compensation makes feedback control
have good line and load regulation with flexible extern al
design.
TheNT3875 features a programmable CV/CC mode control
function s. The CV mode (con stant voltage) function
provides a regulated voltage output a nd the CC mode
(constant current) function provide s a current li mitation
function. The CC current value is set by external resister
during current sense amplifier input stage.
The NT3875 is suita ble for the DC/DC switching power
applications when requested the current lmi it function.The
devices are available in SOP-8L and PSOP-8L packages
and require very few external devices for operation.
Car Charger
Portable Charger Devices
Applications
VIN Operate with 8V ~ 40V Supply V oltage
VOUT Accura cy (Vref =1.2V) +1.0% Over Line
Voltage
CC / CV Mode Control (Constant Current and
Constant Voltage)
+/- 5% Current Limit Accuracy
Output Short Circuit Protection
Output Over Voltage Protection (~120%)
Over Temperature Prote ction
Internal Soft Start ~ 7ms
Fixed Frequency 120 KHz
UVLO Protection (min=6V, typ=7V, max=8V)
Duty Cycle Range (0~90%)
Single Pin to External Compensation and
Shutdown Control
Integrated Power N-MOSFET
Rds_on=150m ohm for NT3875A
Rds_on=240m ohm for NT3875B
(P)SOP- 8L Package
High-Brightness Lighting
Ordering Information
General-Purpose DC/DC Converters with Current
Limit
Oreder Number
NTL3875ASA8
Pkackag
SAOP-8
Remar
Output Current = 2
NTL3875ASW8 PASOP-8
Output Current = 2
NTL3875BSA8 SAOP-8
Output Current = 1
Note: NT products are compatible with the current IPC/
JEDEC J-STD-020 requirement. They are halogen-free,
RoHS compliant and 100% matte tin (Sn) plating that are
suitable for use in SnPb or Pb-free soldering processes.
Pin Configuration
VCC
FB
COMP/EN
GND
1 8 LX
2 7 BST
3 6 ISEN-
4 5 ISEN+
SOP-8L/ PSOP-8L
Noveltek Semiconductor Corp., http://www.noveltek-semi.com
Rev. C30, File Name: NT3875-DS-C3000
1
http://www.Datasheet4U.com

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