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參數(shù)資料
| 型號(hào)： | UCC2857 |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Isolated Boost PFC Preregulator Controller |
| 中文描述： | 隔離升壓PFC前置穩(wěn)壓器控制器 |
| 文件頁數(shù)： | 4/10頁 |
| 文件大小： | 127K |
| 代理商： | UCC2857 |
4
UCC1857
UCC2857
UCC3857
PIN DESCRIPTIONS
AGND:
Reference point of the internal reference and all
thresholds, as well as the return for the remainder of the
device except for the output drivers.
CA–:
Inverting input of the inner current loop error ampli-
fier.
CAO:
Output of the inner current loop error amplifier.
This output can swing between approximately 0.2V and
6V. It is one of the inputs to the PWM comparator.
VAO:
This is the output of the voltage loop error ampli-
fier. It is internally clamped to approximately 5.6V by the
UCC3857 and can swing as low as approximately 0.1V.
Voltages below 0.5V on VAO will disable the MOSDRV
output and force the IGDRV1 and IGDRV2 outputs to a
zero overlap condition.
CRMS:
A capacitor is connected between CRMS and
ground to average the AC line voltage over a half cycle.
CRMS is internally connected to the RMS detection cir-
cuitry.
CT:
A capacitor (low ESR, ESL) is tied between CT and
ground to set the ramp generator switching frequency in
conjunction with RT. The ramp generator frequency is ap-
proximately given by:
0.67
f
R
C
SW
T
T
≈
.
DELAY:
A resistor to VREF and a capacitor to AGND are
connected to DELAY to set the overlap delay time for the
MOSDRV output stage. The overlap delay function can
be disabled by removing the capacitor to AGND.
IAC:
A resistor is connected to the rectified AC input line
voltage from IAC. This provides the internal multiplier
and the RMS detector with instantaneous line voltage in-
formation.
IGDRV1:
Driver output for one of the two external IGBT
power switches.
IGDRV2:
Driver output for one of the two external IGBT
power switches.
MOSDRV:
Driver output for the external power MOSFET
switch.
MOUT:
Output of the analog multiply and divide circuit.
The output current from MOUT is fed into a resistor to
the return leg of the input bridge. The resultant waveform
forms the sine reference for the current error amplifier.
PKLMT:
Inverting input of the peak current limit com-
parator. The threshold for this comparator is nominally
set to 0V. The peak limit comparator terminates the
MOSDRV, IGDRV1 and IGDRV2 outputs when tripped.
PGND:
Return for all high level currents, internally tied to
the output driver stages of the UCC3857.
RT:
A resistor, R
T
is tied between RT and ground to set
the charging current for the internal ramp generator. The
UCC3857 provides a temperature compensated 3.0V at
RT. The oscillator charging current is therefore: 3.0V/R
T
.
Current out of RT should be limited to 250
μ
A for best
performance.
VA–:
This is the feedback input for the outer voltage con-
trol loop. An external opto isolator circuit provides the
ELECTRICAL CHARACTERISTICS:
Unless otherwise stated, these specifications apply for T
A
= 0°C to 70°C for the
UCC3857, –40°C to +85°C for the UCC2857, and –55°C to +125°C for the UCC1857, V
VIN
, V
VD
= 12V, R
T
= 19.2K, C
T
= 680pF.
T
A
= T
J
.
PARAMETER
TEST CONDITIONS
Soft Start
Charge Current
Shutdown Comparator Threshold
Measured on SS
Multiplier
Output Current, IAC Limited
I
AC
= 100
μ
A, V
VAO
= 5.5V, V
CRMS
= 0V
Output Current, Power Limited
I
AC
= 100
μ
A, V
VAO
= 5.5V, V
CRMS
= 1V
Output Current, Zero
I
AC
= 0
Gain Constant
Zero Power, Peak Current
Zero Power Comparator Threshold
Measured on VAO
Peak Current Limit Comparator
Threshold
Note 1: Common mode voltages = 0V, V
CAO
= 3V
MIN
TYP
MAX
UNITS
10
μ
A
V
0
0.4
–200
–200
0
2.5
μ
A
μ
A
μ
A
1/V
–2
2
0.5
0
V
V
Measured on PKLMT
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