NT3875A Datasheet PDF - Noveltek
Part Number | NT3875A | |
Description | Wide Input Range CC/CV Step Down Converter | |
Manufacturers | Noveltek | |
Logo | ||
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Preview 1 page No Preview Available ! 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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Conceptual
( VCC = 12V, TA = +25OC unless otherwise specified.)
Parameter
Symbol
Test Conditions
Supply Input
Supply Voltage Range
Supply Input Current
POWER-ON-RESET
VCC
ICCQ
I
CC
C-OMP/EN = GND
VVCC POR Threshold
VVCC POR Threshold
OSCILLATOR
CCRTH
CCFTH
V7CC Rising.
V6CC Falling
NoFrmal PWM Frequency
MiTnimum On-Time
Dyuty Cycle Range
OSC
ON-MIN
D0ut
TA = -25OC to 80OC2
REFERENCE
ReVference Voltage
Reference Voltage Tolerance
REF
V Load Compensator
REF
PWM ERROR AMPLIFIER
Δ
V
ISEN
=5115mV
FIB Input Current
CVOMP High Voltage
CVOMP Low Voltage
COMP Shutdown Threshold
Voltage
FB VFB =-1.2V
COMP_H
COMP_L
CVOMP Source Current
CVOMP Sink Current
CURRENT SENSE AMPLIFIER
COMP = VCOMP_H -1- V
COMP =-1V
Difference Voltage between
ISEN- and ISEN+
Δ VISEN
PROTECTION
FVB Over Voltage Level
FVB Under Voltage Level
CIurrent Limit
Over Temperature Shutdown
Over Temperature Hysteresis
Soft Start
Ssoft Start Time
Recycle Time
OVP
UVP
LIM
Recent of VREF
Recent of VREF
Ts7
NT3875A/B
Electrical Characteristics
Min Typ Max Units
8 -- 40 V
-3 05. 0A. m
--5 1A0 m
78.7 V
67.7 V
--0 1-2
-z KH
1-0
-8 1z3
H
--0 2-0
-S n
--0 9%
--2 1-.
-V
-1- -1 +%
2%.
-1 01.
--5 5-.
--8 0-.
--4 0-.
-2 4-
-2 4-
uA
-V
-V
-V
-A u
-A u
--5 11-
-V m
--0 1-2
-%
2%5
4A.5
--0 1-6
-
--0 4-
-
OC
OC
2S60
mS
m
Noveltek Semiconductor Corp., http://www.noveltek-semi.com
Rev. C30, File Name: NT3875-DS-C3000
5
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Part DetailsOn this page, you can learn information such as the schematic, equivalent, pinout, replacement, circuit, and manual for NT3875A electronic component. |
Information | Total 8 Pages | |
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Featured Datasheets
Part Number | Description | MFRS |
NT3875A | The function is Wide Input Range CC/CV Step Down Converter. Noveltek | |
NT3875B | The function is Wide Input Range CC/CV Step Down Converter. Noveltek | |
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