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参数资料
| 型号： | PFS716EG |
| 厂商： | POWER INTEGRATIONS INC |
| 元件分类： | 稳压器 |
| 英文描述： | POWER FACTOR CONTROLLER, 95 kHz SWITCHING FREQ-MAX, PZIP6 |
| 封装： | HALOGEN FREE AND ROHS COMPLIANT, PLASTIC, SIP-7/6 |
| 文件页数： | 27/30页 |
| 文件大小： | 2647K |
| 代理商： | PFS716EG |
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Rev. A 11/09/10
6
PFS704-729EG
www.powerint.com
Soft-Start
Check
Sequence
Start
Converter
Is
VCC >
VCC+
Apply 0.5 A
on FB to
Check Open FB
Apply
6 mA V pin
Current Sink
Is VFB > FB
OFF
Is
VFB > FB
OFF
and
VFB < FB
OV
NO
YES
NO
PI-5337-110910
YES
NO
Is IV > IUV+
Remove
6 mA V pin
Current Sink
Detect Input
Voltage Peak
Slew Power-Limit
Over Soft-Start
Duration
NPN and PNP transistor are tied between the output voltage
divider resistors to limit the maximum overshoot and under-
shoot during a load transient response. To reduce switch and
output diode current stress at start-up, the HiperPFS slews the
internal error-voltage from zero to its steady-state value at
start-up. Figure 6 illustrates the relative relationship between
the application of V
CC and power limit soft-start function through
the internal error-voltage.
The error-voltage has a controlled slew rate of 0.25 V/ms at
start-up, corresponding to the t
SOFT time duration for a full scale
error voltage of 5 V.
The beginning of soft-start is gated by the V
CC+, IUV+ and
FEEDBACK pin voltage thresholds in the sequence described
below. Once the applied V
CC is above the VCC+ threshold, the
sensed V pin current is above I
UV+ and the feedback pin voltage
is above FB
OFF, the IC applies a ~6 mA current sink through the
VOLTAGE MONITOR pin and checks that the FEEDBACK pin
voltage is still above the FB
OFF threshold. This checks to ensure
that the FEEDBACK and V pins are not shorted together. In the
event that the FEEDBACK pin voltage is below the FB
OFF
PI-5336-110810
Internal
Error-Voltage
(V
E)
V
CC
Voltage
tSTART-DELAY
tSOFT
VCC+
t
~5 V
threshold the V pin holds the 6 mA current sink indefinitely until
the FEEDBACK pin is above the FB
OFF. If the FEEDBACK pin
voltage is above FB
OFF, the IC releases the current source and
resumes with normal soft-start and operation. Figure 7
illustrates this sequence.
Timing Supervisor and Operating Frequency Range
Since the controller is expected to operate with a variable
switching frequency over the line frequency half-cycle, typically
spanning a range of 24 – 95 kHz, the controller also features a
timing supervisor function which monitors and limits the
maximum switch on-time and off-time as well as ensures a
minimum cycle off-time. The timer supervisor limits the normal
operating frequency range for loads in excess of 10% of the
device peak power rating.
Figure 8a shows the typical half-line frequency profile of the
device switching frequency as a function of input voltage at
peak load conditions. Figure 8b shows for a given line condition
the effect of EcoSmart to the switching frequency as a function
of load (PFS704-716). The switching frequency is not a function
of boost choke inductance.
EcoSmart
The PFS704-716 controllers includes an EcoSmart mode
wherein the internal error signal (V
E) is used to detect the
converter output power. Since the internal error-signal is
directly proportional to the output power, this signal level is used
to set the average switching frequency as a function of output
power. The off-time integrator control reference (V
OFF) is
Figure 7.
Start-Up Sequence.
Figure 5.
Typical Normalized Output Voltage Characteristics as Function of
Normalized Peak Load Rating
Figure 6.
Power Limit Soft-Start Function.
0
0.2
0.4
0.6
1
1.2
1.4
0.8
Normalized to Peak Power Rating
Normalized
to
Set
Output
V
oltage
Regulation
Threshold
1.2
1
0.8
0.6
0.4
0.2
0
PI-6216-113010
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