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PDF CP2894 Data sheet ( Hoja de datos )
| Número de pieza | CP2894 | |
| Descripción | 2.0A 380KHz 23V High Efficiency Step-Down DC/DC Converter | |
| Fabricantes | CAT | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de CP2894 (archivo pdf) en la parte inferior de esta página. Total 13 Páginas | ||
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CP2894
2.0A 380KHz 23V High Efficiency Step-Down DC/DC Converter
Confidentiality Statement:
This Data Sheet (including any attachments) is for the sole use of the intended
recipient(s) and contains confidential, proprietary and privileged information. Any
unauthorized review, use, disclosure or distribution is prohibited. If you are not the
intended recipient, please immediately destroy all copies of the original message.
Free Datasheet http://www.datasheet4u.com/
1 page  
2.0A 380KHz 23V High Efficiency Step-Down DC/DC Converter
CP2894
Function Description
The CP2894 is a constant frequency current mode
PWM step-down converter. It regulates input
voltages from 4.75V to 23V down to an output
voltage as low as 1.23V, and is able to supply
up to 2A of load current.
Oscillator Frequency
Slope compensated current mode PWM control
provides stable switching and cycle-by-cycle
current limit for superior load and line response and
protection of the internal main switch and
synchronous rectifier. The CP2894 switches at a
constant frequency (380 KHz) and regulates the
output voltage. During each cycle the PWM
comparator modulates the power transferred to the
load by changing the inductor peak current based
on the feedback error voltage. During normal
operation, the main switch is turned on for a certain
time to ramp the inductor current at each rising
edge of the internal oscillator, and switched off
when the peak inductor current is above the error
voltage. When the main switch is off, the low
side MOS will be turned on immediately and stay
on until either the next cycle starts.
Short Circuit Protection
The CP2894 has short circuit protection. When the
output is shorted to ground, the oscillator frequency
is reduced to prevent the inductor current from
increasing beyond the NMOS current limit. The
NMOS current limit is also reduced to lower the
short circuit current. The frequency and current limit
will return to the normal values once the short
circuit condition is removed and the feedback
voltage reaches 1.23V.
Maximum Load current
The CP2894 can operate down to 4.75V input
voltage; however the maximum load current
decreases at lower input due to large IR drop on
the main switch and low side switch. The slope
compensation signal reduces the peak inductor
current as a function of the duty cycle to prevent
sub-harmonic oscillations at duty cycles greater
than 50%.
Enable
The EN pin provides electrical on/off control of the
regulator. Once the EN pin voltage exceeds the
threshold voltage, the regulator starts operation and
the internal slow start begins to ramp. If the EN pin
voltage is pulled below the threshold, the regulator
stops switching and the internal slow start resets.
Connecting the pin to ground or to any voltage less
than 0.9V will disable the regulator and activate the
shutdown mode.
Under Voltage Lockout
The CP2894 incorporates an under voltage lockout
circuit to keep the device disable when VIN is below
the UVLO start threshold. During power up, internal
circuit are held inactive until VIN exceeds the UVLO
start threshold voltage. Once the UVLO start
threshold voltage is reached, device start-up begins.
The device operates until VIN fall below the UVLO
stop threshold voltage. The typical hysteretic in the
UVLO comparator is 200mV.
Boost Capacitor
Connect a 0.1μF low ESR ceramic capacitor
between the BS pin and SW pin. This capacitor
provides the gate drive voltage for the high side
MOSFET.
Thermal Shutdown
The CP2894 protects itself from overheating with an
internal thermal shutdown circuit. If the junction
temperature exceeds the thermal shutdown
threshold, the voltage reference is grounded and
high side MOSFET is turned off.
Compensation
The system stability is controlled through COMP pin.
It will present a general design procedure to help
insure a stable and operational circuit. The design
in this data sheet is optimized for particular
requirements. If different conversions are requires,
some of the components may need to be changed
to ensure stability. The power components and their
effects will be determined first, and then the
compensation components will be chosen to
produce stability.
The converters compensation steps are listed
below:
(1). Choose reasonable inductor and output
The CAT logo is a registered trademark of Chip Advanced Technology
2007 Chip Advanced Technology Inc. – All Right Reserved.
Jan-2008 Rev:1.4 5/13
Free Datasheet http://www.datasheet4u.com/
5 Page 
2.0A 380KHz 23V High Efficiency Step-Down DC/DC Converter
CP2894
Carrier Tape & Reel Dimensions
CARRIER TAPE WIDTH
12mm
C NOMINAL
76.2mm
T
0.06±0.01mm
W
9.3±0.1mm
TOTAL LENGTH
300M
The CAT logo is a registered trademark of Chip Advanced Technology
2007 Chip Advanced Technology Inc. – All Right Reserved.
Jan-2008 Rev:1.4 11/13
Free Datasheet http://www.datas
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet CP2894.PDF ] | |
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