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CS1611 bảng dữ liệu(PDF) 9 Page - Cirrus Logic

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CS1610/11/12/13
DS929F3
9
5.4 Boost Stage
The high-voltage FET in the source-follower startup circuit is
source-switched by a variable current source on the SOURCE
pin to operate a boost circuit. Peak FET switching current is
set with an external resistor on pin IPK.
In No-Dimmer Mode, the boost stage begins operating when
the start threshold is reached during each rectified half line-cy-
cle and is disabled at the nominal boost output voltage. The
peak FET switching current determines the percentage of the
rectified input voltage conduction angle over which the boost
stage will operate. The control algorithm adjusts the peak FET
switching current to maximize the operating time of the boost
stage, thus improving the input power factor.
When operating in Leading-edge Dimmer Mode, the boost
stage ensures the hold current requirement of the dimmer is
met from the initiation of each half-line dimmer conduction
cycle until the peak of the rectified input voltage. Trailing-edge
Dimmer Mode boost stage ensures that the trailing-edge is
exposed at the correct time with the correct current.
5.4.1
Maximum Peak Current
The maximum boost inductor peak current is set using an
external resistor, RIPK, on pin IPK, which is sampled
periodically by an ADC. Maximum power output is proportional
to IPK(code). See Equation 1:
where,
= correction term = 0.55
Vrms, typical = nominal operating input RMS voltage
IPK(BST) =IPK(code) x4.1mA
The external resistor, RIPK, is calculated using the peak
current code, IPK(code). See Equation 2:
5.4.2
Output BSTOUT Sense and Input IAC
Sense
A current proportional to the boost output voltage, VBST, is
supplied to the IC on pin BSTOUT and is used as a feedback
control signal. The ADC is used to measure the magnitude of
the IBSTOUT current through resistor RBST. The magnitude of
the IBSTOUT current is then compared to an internal reference
current (Iref) of 133A.
Figure 9. BSTOUT Input Pin Model
Resistor RBST sets the feedback current at the nominal boost
output voltage. For the CS1611/13, RBST is calculated as
shown in Equation 3:
where,
VBST = Nominal boost output voltage
Iref = Internal reference current
For 120VAC line voltage applications (CS1610/12), nominal
boost output voltage, VBST, is 200V, and resistor RBST is 1.5M.
By using digital loop compensation, the voltage feedback
signal does not require an external compensation network.
A current proportional to the AC input voltage is supplied to the
IC on pin IAC and is used by the boost control algorithm.
Figure 10. IAC Input Pin Model
Resistor RIAC sets the IAC current and is defined in Equation 4:
For optimal performance, RIAC and RBST should use 1% or
better resistors for best VBST voltage accuracy.
5.4.3
Boost Auxiliary Winding
The boost auxiliary winding is used for zero-current detection
(ZCD). The voltage on the auxiliary winding is sensed through
the BSTAUX pin of the IC. It is also used to deliver current
during steady-state operation, as mentioned in section 5.2
Startup Circuit
on page 8.
Pin max
,
I
PK BST

Vrms typical
,

2
--------------------------------------------------------------------
=
[Eq.1]
RIPK
4000000
IPK code

-----------------------
=
[Eq.2]
VBST
CS1610 /11/12/13
15k
ADC
R8
RBST
IBSTOUT
R9
Iref
16
BSTOUT
12
RBST
VBST
Iref
--------------
400V
133
A
------------------
3M
==
[Eq.3]
R3
RIAC
IAC
I
AC
Vrect
CS1610 /11/12/13
15k
ADC
R4
2
Iref
12
RIAC
RBST
=
[Eq.4]


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