Current Controller. CX2905 Datasheet

CX2905 Controller. Datasheet pdf. Equivalent

CX2905 Datasheet
Recommendation CX2905 Datasheet
Part CX2905
Description Constant Voltage and Constant Current Controller
Feature CX2905; .
Manufacture CHENGXINWEI
Datasheet
Download CX2905 Datasheet





CHENGXINWEI CX2905
深圳市诚芯微科技有限公司
SHENZHEN CHENGXINWEI TECHNOLOGY CO., LTD.
CX2905
Constant Voltage and Constant Current Controller(Preliminary)
www.cxwic.com
1 页共 7



CHENGXINWEI CX2905
深圳市诚芯微科技有限公司
SHENZHEN CHENGXINWEI TECHNOLOGY CO. LTD.
CX2905
Description
CX2905 is a highly integrated solution for SMPS
applications requiring CV (constant voltage) and CC
(constant current) modes.
CX2905 integrates one voltage reference, two
operational amplifiers (the outputs are OR’ed
together, common collectors), and a current
sensing circuit.
The voltage reference, together with one
operational amplifier, makes it an ideal voltage
controller. The other low voltage reference,
together with another operational amplifier, makes it
an ideal current limiter for low side output current
sensing. The current threshold is fixed, and precise.
The CX2905, housed in space-saving SOT23-6L
package, is ideal for space sensitive applications
such as adapters, cellphone chargers, Digital
Camera chargers, and other battery chargers.
Features
Constant Voltage and Constant Current Control
Low Voltage Operation at 3V
Precision Internal Voltage Reference
Low External Component Count
Current Sink Output Stage
Easy Compensation
Low AC Mains Voltage Rejection
Rugged 2KV ESD withstand capability.
Available in SOT-23-6LPackage.
RoHS Compliant and 100% Lead (Pb)-Free
Application
Adapters
Digital Camera Chargers.
Cellphone Chargers.
Other Battery Chargers
Ordering Information/Making Information
Device
Package
VOUT
Pin Configuration
CX2905
SOT-23-6L
(Lead-free)
Fixed output voltages
1.21V
Package
Making Information
PIN1 is down in the left-hand
corner. The last character is the
batch number.A dot on top right
corner is for lead-free process.
Pin Description
Name Pin#
Type
Function
VCTRL
1
Analog Input
Input Pin of the Voltage Control Loop
GND
2
Power Supply Ground Line. 0V Reference For All Voltages
VOUT
3 Current Sink Output Output Pin. Sinking Current Only
ICTRL
4
Analog Input
Input Pin of the Current Control Loop
VSENSE
5
Analog Input
Input Pin of the Current Control Loop
VCC 6 Power Supply Positive Power Supply Line
www.cxwic.com
2 页 共 7



CHENGXINWEI CX2905
深圳市诚芯微科技有限公司
SHENZHEN CHENGXINWEI TECHNOLOGY CO. LTD.
CX2905
Absolute Maximum Rating
Symbol
Parameter
VCC DC Supply Voltage
VIN Input Supply Voltage
θJA Thermal Resistance Junction to Ambient
TJ
TSTG
TLEAD
Operating Junction Temperature Range
Storage Temperature Range
Lead Temperature (Soldering 10 Sec)
Maximum
14
-0.3~ VCC
250
0 to 125
-40 to 150
260
Units
V
V
°C/W
°C
°C
°C
Electrical Characteristic
VCC = 5.0V, TA = 25°C, unless otherwise specified.
Symbol Parameter
Total Current Consumption
ICC Total Supply Current - not taking the output sinking
current into account
Voltage Control Loop
Gmv
Transconduction Gain (VCTRL). Sink Current Only1)
VREF
Voltage Control Loop Reference2)
IIBV Input Bias Current (VCTRL)
Current Control Loop
Gmi Transconduction Gain (ICTRL). Sink Current Only3)
VSENSE Current Control Loop Reference4)
IIBI Current out of pin ICTRL at -200mV
Output Stage
Test Condition Min Typ Max Unit
0.4 mA
0 < TA < 85°C
0.5
0 < TA < 85°C
0 < TA < 85°C
0 < TA < 85°C
1.0 mA/mV
2.0
1.186 1.21 1.234 V
50 nA
100
0 < TA < 85°C
IOUT = 2.5mA
0 < TA < 85°C
0 < TA < 85°C
2.5 mA/mV
200 mV
25 µA
50
VOL Low output voltage at 10 mA sinking current
0 < TA < 85°C
350
mV
IOS Output Short Circuit Current. Output to VCC. Sink
22 mA
Current Only
0 < TA < 85°C
35
1. If the voltage on VCTRL (the negative input of the amplifier) is higher than the positive amplifier input
(VREF=1.210V), and it is increased by 1mV, the sinking current at the output OUT will be increased by 1.0mA.
2. The internal Voltage Reference is set at 1.210V. The internal Voltage Reference is fixed by bandgap, and
trimmed to 0.5% accuracy at room temperature.
3. When the positive input at ICTRL is lower than -200mV, and the voltage is decreased by 1mV, the sinking current at
the output OUT will be increased by 2.5mA.
4. The internal current sense threshold is set to -200mV. The current control loop precision takes into account the
cumulative effects of the internal voltage reference deviation as well as the input offset voltage of the trans-
conduction operational amplifier.
www.cxwic.com
3 页 共 7





@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site (Privacy Policy & Contact)