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CS1600 데이터시트 PDF




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부품번호 CS1600 기능
기능 Low-cost PFC Controller
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CS1600 데이터시트, 핀배열, 회로
CS1600
www.DataSheet4U.com
Low-cost PFC Controller for Electronic Ballasts
Features & Description
Lowest PFC System Cost for Electronic Ballasts
Variable Frequency Discontinuous Conduction Mode
Improved Efficiency Due to Variable Switching Frequency
EMI Signature Reduction from Digital Noise Shaping
Integrated Feedback Compensation
Overvoltage Protection with Hysteresis
Overpower Protection with Shutdown
UVLO with Wide Hysteresis
Thermal Shutdown with Hysteresis
Description
CS1600 is a high-performance Variable Frequency Discontinu-
ous Conduction Mode (VF - DCM), active Power Factor
Correction (PFC) controller, optimized to deliver the lowest PFC
system cost for electronic ballast applications.
A variable ON time / variable frequency algorithm is used to
achieve near unity power factor. This algorithm spreads the EMI
frequency spectrum, which reduces the conducted EMI filtering
requirements. The feedback loop is closed through an integrated
compensation network within the IC, eliminating the need for
additional external components. Protection features such as
overvoltage, overcurrent, overpower, open- and short-circuit pro-
tection, overtemperature, and brownout help protect the device
during abnormal transient conditions.
Pin Assignments
NC 1
8 NC
STBY 2
7 VDD
IAC 3
6 GD
FB 4
5 GND
8-lead SOIC
D5
L1
BR1
AC
Mains
BR1
R1a RAC
BR1
R1b CS1600
1
R1c NC
C1
3
IAC
2
STBY
4
FB
+12V
7
VDD
6
GD
BR1
C2 8
NC
5
GND
R3
D6
R2a
RFB
R2b
R2c
Q1
C3a Clink
C3b
Advance Product Information
This document contains information for a product under development.
Cirrus Logic reserves the right to modify this product without notice.
Cirrus Logic, Inc.
http://www.cirrus.com
Copyright Cirrus Logic, Inc. 2010
(All Rights Reserved)
MAY ‘10
DS904A5




CS1600 pdf, 반도체, 판매, 대치품
CS1600
Parameter
Fall Time
Output Voltage Low
Output Voltage High
Feedback and Protection
Reference Current
Overvoltage Protection Threshold
Overvoltage Protection Current Hysteresis
Undervoltage Protection Threshold
Condition
CL = 1 nF, VDD = 13 V
IGD = -200 mA,VDD = 13 V
IGD = 100 mA,VDD = 13 V
Symbol
tf
VOL
VOH
Min
-
-
11.3
Iref
IOVP/Iref
IOVP(Hy)
IUVP/Iref
127
105
-
83
Undervoltage Protection Current Hysteresis
Overpower Protection Threshold 3,4
Overpower Protection Recovery 3,4
% of full load as defined by Eq. 3
Input Brownout Protection Threshold7
Vout = 460V, GDRV turns off
Input Brownout Recovery Threshold7
Vout = 460V, GDRV turns on
Thermal Protection
Thermal Shutdown Threshold 3
Thermal Shutdown Hysteresis
STBY Input
Logic Threshold 5
Low
High
IUVP(Hy)
VBP(th)
VBR
TSD
TSD(Hy)
-
123
35
82
94
130
-
-
VDD – 0.8
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Typ Max Unit
15 25 ns
0.9 1.3 v
11.8 - v
130 133 μA
107 110 %
4 -%
85 87 %
10 - %
125 127 %
49 60 %
86 90 Vrms
97 100 Vrms
143 155 ºC
9 - ºC
-
-
0.8
-
V
2.3 Thermal Characteristics
Symbol
RθJA
RθJC
Parameter
Thermal Resistance (Junction to Ambient)6.
Thermal Resistance (Junction to Case)6.
Value
TBD
TBD
Unit
ºC / W
ºC / W
3. Specifications guaranteed by design & characterization.
4. Specifications measured as an instantaneous quantity NOT as a time-averaged quantity.
5. STBY is designed to be driven by an open-collector device. The input is internally pulled up with a 600 kΩ resistor.
6. The package thermal impedance is calculated in accordance with JESD 51.
7. For an output voltage, Vout, other than 460V, the threshold scales by a factor of Vout/460
4 DS904A5

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CS1600 전자부품, 판매, 대치품
CS1600
4. INTRODUCTION
CS1600 is a digitally controlled Power Factor Correction
(PFC) controller that operates in the Variable Frequency
Discontinuous Conduction Mode (VF - DCM). The CS1600
uses a proprietary digital algorithm to optimize control of the
power switch to deliver highly efficient performance for
electronic ballast applications. With this control scheme, the
total number of external components needed is minimized in
comparison to conventional control techniques, thus reducing
the overall system cost.
Digital control is achieved by constantly monitoring two voltages
– the PFC output voltage (Vlink) at pin FB and the rectified AC line
voltage (Vrect) at pin IAC. This is done by measuring the currents
that flow into the respective pins. These currents are then fed to
the inputs of two analog-to-digital converters (ADCs) and are
compared against an internal target current, Iref.
The digital outputs of the two ADCs are then processed in a
control algorithm which determines the behavior of the
CS1600 during start-up, normal operation, and under fault
conditions such as brownout, overvoltage, overcurrent,
overpower, and over-temperature. Details of operation during
these conditions are discussed in later sections of this
document.
Some of the key features of the CS1600 are as follows:
• Discontinuous Conduction Mode with Continuously
Variable Switching Frequency
The PFC switching frequency is varied every switching
cycle. This allows for a spread spectrum which minimizes
the conducted EMI peaks at any given frequency, thereby
minimizing the size and cost of the EMI filter required at
the front-end.
During start-up, the control algorithm limits the maximum
ON time and adjusts the frequency to avoid inductor sat-
uration and provides a near-trapezoidal envelope for the
input current during every half cycle. During normal oper-
ation, as the line voltage changes over half of a line cycle,
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the frequency varies approximately 2:1 as shown in
Figure 7 below.
120
Switching Frequency (% of Max)
100
80
60
Line Voltage (% of Max)
40
20
0
0 45 90 135
Rectified Line Voltage Phase (Deg.)
180
Figure 7. Switching Frequency vs. Phase Angle
Maximum power transfer occurs at the peak of the AC line
voltage, at which time, the frequency reaches its maxi-
mum value. Switching losses are minimized during peri-
ods of low power transfer by switching at lower
frequencies near the zero-crossing of the AC line.
This switching frequency profile helps reduce total BOM
cost through savings in the size of the boost inductor and
the EMI filter components, while at the same time, im-
proving overall system efficiency.
• Integrated Feedback Control
No external feedback compensation components are re-
quired for the CS1600. The internal digital control engine
self-compensates the feedback error signal using an
adaptive control algorithm.
• Protection Features
The CS1600 provides various protection features such as
undervoltage, overcurrent, overpower, open and short
circuit protection and brownout. It also provides the user
with the option of using the STBY pin to disable switching
of the device.
DS904A5
7

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