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PDF UC3854 Data sheet ( Hoja de datos )
| Número de pieza | UC3854 | |
| Descripción | ENHANCED HIGH POWER FACTOR PREREGULATOR | |
| Fabricantes | Unisonic Technologies | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de UC3854 (archivo pdf) en la parte inferior de esta página. Total 6 Páginas | ||
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UNISONIC TECHNOLOGIES CO., LTD
UC3854
Preliminary
ENHANCED HIGH POWER
FACTOR PREREGULATOR
DESCRIPTION
The UTC UC3854 provide all the functions necessary for active
power factor corrected preregulators. The controller achieves near
unity power factor by shaping the AC input line current waveform to
correspond to that of AC input line voltage. Average current mode
control maintains stable, low distortion sinusoidal line current
without the need for slope compensation, unlike peak current mode
control.
Designed in UTC’s Bipolar process, the UTC UC3854 offers
new features such as wide bandwidth, low offset Current Amplifier,
a faster responding and improved accuracy enable comparator, a
VREF "good" comparator, UVLO threshold options (16/10V for
offline, 10.5/10V for startup from an auxiliary 12V regulator), lower
startup supply current, and an enhanced multiply/divide circuit.
New features like the improved amplifier current sinking capability,
amplifier output clamps, and low offset VAC pin reduce the external
component count while improving performance. Improved common
mode input range of the Multiplier output/Current Amp input allow
the designer greater flexibility in choosing a method for current
sensing. Unlike its predecessor, the maximum multiplier output
current is now clamped to a maximum of 2 * IAC at all times.
A 1% 7.5V reference, fixed frequency oscillator, PWM, Voltage
Amplifier with softstart, line voltage feedforward (VRMS squarer),
input supply voltage clamp, and over current comparator round out
the list of features.
FEATURES
* Controls Boost Preregulator to Near Unity Power Factor
* Limits Line Distortion
* World-Wide Line Operation
* Accurate Power Limiting
* Fixed Frequency Average Current Mode Control
* High Bandwidth (5MHz), Low Offset Current Amplifier
* Integrated Current and Voltage Amp Output Clamps
* Multiplier Improvements: Linearity, 500mV VAC Offset (eliminates
external resistor), 0-5V Multout Common Mode Range
* VREF "GOOD" Comparator
* Faster and Improved Accuracy ENABLE Comparator
* 300uA Startup Supply Current
CMOS IC
SOP-16
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
1 of 6
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UC3854
Preliminary
ELECTRICAL CHARACTERISTICS (Cont.)
PARAMETER
SYMBOL TEST CONDITIONS
Oscillator
Initial Accuracy
Voltage Stability
Total Variation
f0
△fVCC
fT
TA= 25°C
VCC=12 ~ 18V
Line, Temp
Ramp Amplitude (p-p)
VPP
Ramp Valley Voltage
VVAL
Enable/Softstart /Current Limit
Enable Threshold
VENA
Enable Hysteresis
VHYS VFAULT= 2.5V
Enable Input Bias Current
IENA VENABLE= 0V
Propagation Delay to Disable
SS Charge Current
TENA
ISS
Enable Overdrive= -100mV (Note 1)
VSOFTSTART= 2.5V
PKLMT Offset Voltage
VOFFP
PKLMT Input Current
IPK VPKLMT= -0.1V
PKLMT Propagation Delay
TPK (Note 1)
Multiplier
Output Current - IAC Limited
ILIM IAC=100mA, VRMS= 1V, RSET= 10k
Output Current - Zero
IZERO IAC=0uA, RSET= 10k
Output Current - Power Limited IPLIM VRMS= 1.5V, Va = 6V
VRMS= 1.5V, Va= 2V
Output Current
IMULT
VRMS= 1.5V, Va= 5V
VRMS= 5V, Va= 2V
VRMS= 5V, Va= 5V
Gain Constant
Gate Driver
K (Note 2) VRMS= 1.5V, TJ= 25°C, Va = 6V
Output High Voltage
VHG IOUT= -200mA, VCC=15V
Output Low Voltage Output
Low (UVLO)
IOUT= 200mA
VLG IOUT= 10mA
IOUT= 50mA, VCC=0V
Output Rise / Fall Time
TRF CLOAD= 1nF (Note 1)
Output Peak Current
IPEAK CLOAD= 10nF (Note 1)
Notes: 1. Guaranteed by design, not 100% tested in production
2. Gain constant (K)= IAC *(Va 1.5V)
VRMS 2 * IMO
CMOS IC
MIN TYP MAX UNIT
85 100 115 kHz
1%
80 120 kHz
4.9 5.9 V
0.8 1.3 V
2.35
10
-15
-200
2.55
500
-2
300
14
-100
150
2.8
600
-5
24
15
V
mV
uA
ns
mV
uA
ns
-220
-2.0
-230
-1.1
-200
-0.2
-200
-22
-156
-2
-14
-1.0
-170
2.0
-170
-0.9
uA
uA
uA
uA
uA
uA
uA
A/A
12 12.8
v
1 2.2 V
300 500 mV
0.9 1.5 V
35 ns
1.0 A
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 6
QW-R103-082.a
5 Page | ||
| Páginas | Total 6 Páginas | |
| PDF Descargar | [ Datasheet UC3854.PDF ] | |
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