DC-DC Controller. CN5120 Datasheet

CN5120 Controller. Datasheet pdf. Equivalent


CONSONANCE CN5120
CONSONANCE
4.5V to 32V Input Current Mode Boost DC-DC Controller
CN5120
General Description:
The CN5120 is a current mode fixed-frequency
PWM controller for both flyback and step-up
DC-DC converters. The device operates from an
input supply between 4.5V and 32V and provides to
drive an external N-channel MOSFET.
The CN5120 contains all the necessary building
blocks including a bandgap reference, a 330KHz
oscillator, current-mode control circuitry, chip
shutdown block, softstart block and gate driver, etc.
Current mode control provides improved transient
response and simplified loop compensation. On-chip
soft start reduces the inrush current on power up. The
other features include chip shutdown, over voltage
protection, built-in 5V regulator and slope
compensation, etc.
The CN5120 is available in 10-pin SSOP package.
Applications:
TFT-LCD Bias Supplies
XDSL Power Supplies
Medical Equipments
Digital Video Cameras
Portable Devices
Features:
Peak Current Mode DC-DC Boost/ Flyback
Controller
4.5V to 32V Input Range
330kHz Switching Frequency
±2% Output Voltage Accuracy
Cycle-by-Cycle Peak Inductor Current Limit
On-Chip Slope Compensation
Internal Soft-start
Built-in 5V regulator
Low Shutdown Current
Operating Temperature Range:
40to 85
Available in 10-pin SSOP package.
Lead-free, Rohs-compliant and Halogen-free
Pin Assignment
NC 1
FB 2
COMP 3
NC 4
SHDN 5
CN5120
10 CS
9 GND
8 DRV
7 VCC
6 VIN
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CN5120 Datasheet
Recommendation CN5120 Datasheet
Part CN5120
Description 4.5V to 32V Input Current Mode Boost DC-DC Controller
Feature CN5120; CONSONANCE 4.5V to 32V Input Current Mode Boost DC-DC Controller CN5120 General Description: The .
Manufacture CONSONANCE
Datasheet
Download CN5120 Datasheet




CONSONANCE CN5120
CONSONANCE
Typical Application Circuit
Figure 1 Typical Application Circuit
Pin Description
No. Name
Description
1 NC No Connection.
2
FB
Feedback Pin. The output voltage is feedback to this pin. Generally this pin is
connected to the external resistor divider to sense the output voltage.
3
COMP
Compensation Pin. Connect the compensation network between COMP pin and
GND.
4 NC No Connection.
Shutdown Input Pin. Pulling this pin high, places the part into a shutdown mode.
5
SHDN
Shutdown mode is characterized by a very low quiescent current. In shutdown mode,
all the functionality of all blocks is disabled and the on-chip 5V regulator is also
shutdown. Pulling this pin low places the part into normal operation mode.
6
VIN
Input Supply Voltage. Positive terminal of input supply. The input voltage range is
4.5V to 32V. Connect a local bypass capacitor from this pin to GND.
5V Regulator output. A bypass capacitor of 4.7uF should be connected from this pin
7
VCC
to GND. If the input voltage is less than 5.5V, the voltage at VCC pin may be less
than 5V.
8
DRV
Gate Drive Pin. Gate drive for the external N-channel MOSFET. Connect this pin to
the gate of external N-channel MOSFET.
9
GND
Ground. Negative terminal of input supply.
10
CS
Inductor Current Sense Pin. The inductor current is sensed at CS pin on the
cycle-by-cycle basis for both the current mode control and over current protection.
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CONSONANCE CN5120
CONSONANCE
Absolute Maximum Ratings
VIN Terminal Voltage…………..…0.3V to 36V
Other Terminals Voltage…………..0.3V to 6.5V
Operating Temperature…..............40to 85
Thermal Resistance(Junction to Case) .....200/W
Maximum Junction Temperature……………150
Storage Temperature……….......65to 150
Lead Temperature(Soldering)…………...….260
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the
device. These are stress ratings only, and functional operation of the device at these or any other
conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure
to absolute maximum rating conditions for extended periods may affect device reliability.
Electrical Characteristics
(VIN = 12V, TA=-40°C to +85°C, Typical values are at TA+25°C, unless otherwise noted)
Parameters
Input Supply Voltage
Input Supply Current
Shutdown Current
Switching Frequency
Maximum Duty Cycle
Minimum On Time
Soft-Start Time
Over current Threshold
FB Pin
Feedback Voltage
FB Pin Bias Current
SHDN Pin
Input Voltage High
Input Voltage Low
SHDN Bias Current
DRV Pin
Source Current
Sink Current
Fall Fime
Rise Time
VCC Pin
Output Voltage
Load Regulation
Line Regulation
PSRR
Startup Time
Symbol
VIN
IVIN
ISD
fSW
DMAX
TMIN
TSS
VCS(OC)
VFB
IFB
VIH
VIL
ISHDN
tf
tr
VCC
PSRR
tSTART
Test Conditions
VFB1.3V, VSHDN=0V
SHDN3V, VIN12V
SHDN3V, VIN30V
Normal operation
Measured at CS pin
Normal operation
VDRV4V
VDRV1V
CDRV2nF
CDRV2nF
IVCC0.1mA to 4mA,
VIN5.5V to 32V
IVCC0.1mA to 4mA
VIN6V to 32V, IVCC3mA
IVCC3mAfIN10kHz
VCC0 to 4.5V, COUT4.7uF
Min Typ
4.5
700 810
3.6 5.2
9 13
285 330
93
100
9.5
170 180
1.181
100
1.205
0
2.3
100
0
0.8
1.5
22
30
4.7
5
6
-35
5
Max
32
920
6.8
17
375
190
1.229
100
0.5
100
5.3
Unit
V
A
A
KHz
ns
ms
mV
V
nA
V
V
nA
A
A
ns
ns
V
Ohm
mV
dB
mS
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