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參數(shù)資料
| 型號： | HV9906DB3 |
| 廠商： | SUPERTEX INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Off-Line PFC Current Source Controller |
| 中文描述： | 0.7 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數(shù)： | 6/10頁 |
| 文件大?。?/td> | 445K |
| 代理商： | HV9906DB3 |
HV9906
Design Information
Programming On Time
The instantaneous voltage applied to the V
ON
pin determines the
gate drive output on time for the VCO cycle. The on time is
inversely proportional to the voltage applied to the V
ON
pin and may
be calculated using the following equation:
(
ON
V
Where the effective control range of V
ON
is limited between 0.2V
and 6V. For V
ON
= 0V P(V
ON
) defaults to a nominal maximum of
17.8
μ
S.
Depending on the converter topology and worst case operating
conditions the minimum on time and thus the duty cycle may be
programmed.
Programming the Sense Inputs
The PS and NS sense pins are regulated at +1V and each needs
to be programmed to source the same current at the converter
output regulation set point.
In order to calculate the values of R
NS
and R
PS,
the maximum
sense current, which will avoid integrator saturation, must be
determined. Since by design the circuit will inherently soft start
from its lowest frequency, the designer only needs to establish the
lowest operating frequency (f
MIN
) for the design, which corresponds
to minimum converter output power under closed loop control.
Once this frequency is established the maximum PS pin sense
current I
PS(MAX)
, which occurs during start up when V
PSENSE
=
V
NSENSE
, can be calculated using the following equation.
f
V
C
I
×
×
=
Where C
MIN
is the minimum value of the integrator capacitors, V
SAT
is the minimum saturation level of the integrators and f
MIN
is the
minimum operating frequency of the converter. Inserting these
values the above equation can be simplified.
10
20
(
)
95
.
(
I
×
×
=
10
)
MAX
(
PS
f
10
14
.
I
×
×
=
For the general case, where at regulation neither sensed node
might be at ground potential, the following equation may be used
to calculate the required R
resistor value where V
is the
most negative value that the node will see during starting or normal
operation.
V
V
1
R
=
)
6
ON
10
65
.
085
.
V
P
×
+
≈
MIN
SAT
MIN
)
MAX
(
PS
MIN
f
12
)
MAX
(
PS
6
)
×
×
MIN
)
MAX
(
PS
I
)
MIN
(
PSENSE
PS
Once the value of R
PS
has been determined the I
PS
and I
NS
sense
currents at the regulation point can be calculated and the value of
R
NS
can be determined as follows.
V
V
1
I
I
=
=
PS
PSENSE
NS
PS
R
NS
I
NSENSE
V
NS
V
1
R
=
Where I
NS
= I
PS
= average current in the NS and PS pins at stable
output regulation, V
is the most negative sensed node
voltage with respect to +1V and V
PSENSE
is the least negative
sensed node voltage with respect +1V. V
NSENSE
and V
PSENSE
must
be less than +1V and V
NSENSE
is always more negative than
V
PSENSE
.
Example 1.
For a converter operating at a minimum frequency of 50KHz and
sensing a –1V feedback node voltage with respect to ground, the
resistors connected in series with the PS and NS pins will be
determined as follows.
10
14
.
I
)
MAX
(
PS
×
×
=
To provide a margin of safety let I
PS(MAX)
= 5
μ
A. Since in this
configuration the resistor in series with the PS pin is connected to
ground, the sense node voltage V
PSENSE(MIN)
= 0V.
=
I
)
MAX
(
PS
V
V
1
I
I
PS
=
5
I
NS
Example 2.
For a converter operating at a minimum frequency of 100KHz and
sensing a +0.5V feedback node voltage with respect to ground, the
resistors connected in series with the PS and NS pins will be
determined as follows.
1
10
14
.
I
)
MAX
(
PS
×
×
=
To provide a margin of safety let I
PS(MAX)
= 10
μ
A. In this
configuration the most negative value of V
PSENSE(MIN)
occurs during
startup at which time it is 0V.
=
I
)
MAX
(
PS
V
V
1
I
I
PS
=
5
I
NS
Protection
The HV9906 used as a current source is inherently protected in the
case of an output short. Over voltage protection is easily
accomplished, in the flyback-buck application for example, with no
more than two diodes. Simple protection for voltage mode
applications, and other topologies is easy to accomplish. Call for
more information.
A
7
10
5
4
10
μ
=
×
=
×
=
k
200
10
5
)
0
(
1
V
V
1
R
6
)
MIN
(
PSENSE
PS
A
5
k
200
0
1
R
PSENSE
NS
PS
μ
=
=
=
=
=
×
=
k
400
10
)
(
1
V
V
1
R
6
NSENSE
NS
A
4
11
10
5
10
μ
=
×
=
×
=
k
100
10
10
0
1
V
V
1
R
6
)
MIN
(
PSENSE
PS
A
5
k
100
)
5
(
1
R
PSENSE
NS
PS
μ
=
+
=
=
=
=
×
10
=
k
200
0
1
V
V
1
R
6
NSENSE
NS
Supertex, Inc. 1235 Bordeaux Drive, Sunnyvale, CA 94089 TEL: (408) 744-0100 FAX: (408) 222-4895 www.supertex.com
6 07/23/02
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