CS1600
8-lead SOIC
NC
STBY
IAC
FB
NC
VDD
GD
GND
1
2
3
4
8
7
6
5
D6
C1
D5
C2
BR1
BR1
BR1
BR1
AC
Mains
+12V
L1
Q1
R3
CS1600
IAC
NC
FB
STBY
VDD
GND
NC
GD
2
3
1
7
8
6
4
5
R1a
R1b
R2b
R2a
C3a
C3b
R2c
R1c
R
AC
R
FB
C
link
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 Discontinuous Conduction Mode (VF - DCM), active Power Factor
Correction (PFC) controller, optimized to deliver the lowe st 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 protection, overtemperature, and brownout help protect the device
during abnormal transient conditions.
Pin Assignments
Advance Product Information
Cirrus Logic, Inc.
http://www.cirrus.com
This document contains information for a product under development.
Cirrus Logic reserves the right to modify this product without notice.
Copyright Cirrus Logic, Inc. 2010
(All Rights Reserved)
JUN ‘10
DS904A6
1. PIN DESCRIPTIONS
NC
STBY
IAC
FB
NC
VDD
GD
GND
1
2
3
4
8
7
6
5
CS1600
Table 1. Pin Descriptions
Pin Name Pin # I/O
NC
STBY
IAC
FB
GND
GD
VDD
1, 8 -
2IN
3IN
4IN
5–
6OUT
7IN
Description
No Connect — Connect these pins to VDD to prevent any leakage path that could
arise from leaving them unterminated.
Standby — This is an active-low pin. Shorting this pin to GND disables PFC switching. The input has a pull-up resistor and should be driven with an open-collector
device. Leave this pin unterminated when not in use.
Rectified Line Voltage Sense — The IAC pin is used to sense the rectified line voltage. This signal, in conjunction with the signal on the FB pin, is used in the Power
Factor Correction (PFC) algorithm
A filter capacitor of up to 2.2 nF may be added between this pin and VDD to provide
noise immunity.
Feedback Voltage Sense — The FB pin is used to sense the output voltage of the
PFC stage. This signal, in conjunction with the signal on the IAC pin, is used in the
Power Factor Correction (PFC) algorithm.
A filter capacitor of up to 2.2 nF may be added between this pin and VDD to provide
noise immunity.
Ground — GND is a common reference for all the functional blocks in this device.
Gate Drive — GD is the output of the device with a source capability of 0.5 A and a
current sink capacity of 1 A.
IC Supply Voltage — VDD is the input used to provide bias to the device. This pin
has an internal shunt to ground. An external bias needs to be applied for steadystate operation. A low-ESR ceramic decoupling capacitor at this pin is recommended
for reliable operation of this device.
2 DS904A6
CS1600
2. CHARACTERISTICS AND SPECIFICATIONS
2.1 Absolute Maximum Ratings
Pin Symbol Parameter Value Unit
7
2,3,4 V
3,4 I
V
DD
IN
IC Supply Voltage
Input Voltage -0.5 to V
IN
Input Current 50 mA
1
6VGDGate Drive Voltage -0.3 to V
6I
GD
Gate Drive Current -1.0 / +0.5 A
1,2,3,4,5,6,8 ESD Human Body Model 2000 V
1,2,3,4,5,6,8 ESD Machine Model 200 V
1,2,3,4,5,6,8 ESD Charged Device Model 500 V
-P
-T
-T
Stg
D
Total Power Dissipation at 50° C
Junction Temperature Operating Range -40 to +125 ºC
J
Storage Temperature Range -65 to +150 ºC
2
Notes: 1. The CS1600 has an internal shunt regulator that controls the nominal operating voltage on the VDD pin.
2. Long term operation at the maximum junction temperature will result in reduced product life. Derate internal power
dissipation at the rate of 50 mW / ºC for variation over temperature.
V
z
DD
DD
600 mW
V
V
V
2.2 Electrical Characteristics
Recommended operating conditions (unless otherwise specified): TA = TJ = -40º to +125º C, VDD = 10 to 15 V, GND = 0 V.
Typical values are at T
Parameter Condition Symbol Min Typ Max Unit
Supply Voltage
V
DD
Turn-on Threshold Voltage
V
DD
V
Turn-off Threshold Voltage
DD
UVLO Hysteresis V
Zener Voltage
Supply Current Section
Start-up Supply Current V
Standby Supply Current STBY
Operating Supply Current C
PFC Gate Drive Section
Maximum Operating Frequency
Minimum Operating Frequency
Minimum Duty Cycle V
Maximum Duty Cycle
Minimum On Time VDD=13V t
Output Source Resistance I
Output Sink Resistance I
Rise Time C
= 25º C.
A
3,4
3,4
3,4
V
increasing V
DD
decreasing V
V
DD
=20mA V
I
DD
< V
DD
th(St)
< 0.8V I
= 1nF, fsw = 70 kHz I
L
Normal mode, VDD=13V f
Normal mode, VDD=13V f
= 13 V, STBY < 0.8 V t
DD
VDD=13V D
=100 mA, VDD=13V R
GD
=-200mA, VDD=13V R
GD
=1 nF, VDD=13V t
L
th(St)
th(Stp)
Hys
Z
I
ST
SB
DD
SW(max)
SW(min)
DC_min
max
on_min
OH
OL
r
8.4 8.8 9.3 V
7.1 7.4 7.9 V
-1.3-V
17.0 17.9 18.5 V
-6880μA
-80112μA
-1.71.9mA
62 66 70 kHz
20 22 23 kHz
--0%
64 66 68 %
0.45 0.5 0.55 μs
-9-Ω
-6-Ω
-3245ns
DS904A6 3
Parameter Condition Symbol Min Typ Max Unit
Fall Time C
Output Voltage Low I
Output Voltage High I
=1 nF, VDD=13V t
L
GD =-200mA,VDD =13V V
GD =100mA,VDD =13V V
Feedback and Protection
Reference Current I
Overvoltage Protection Threshold I
Overvoltage Protection Current Hysteresis I
Undervoltage Protection Threshold
OVP/Iref
OVP(Hy)
I
UVP/Iref
OL
OH
ref
CS1600
f
-1525ns
-0.91.3v
11.3 11.8 - v
127 130 133 μA
105 107 110 %
-4-%
83 85 87 %
Undervoltage Protection Current Hysteresis I
3,4
3,4
% of full load as defined by Eq. 3
7
7
V
= 460V, GDRV turns off V
out
V
= 460V, GDRV turns on V
out
Overpower Protection Threshold
Overpower Protection Recovery
Input Brownout Protection Threshold
Input Brownout Recovery Threshold
UVP(Hy)
BP(th)
BR
-10-%
123 125 127 %
35 49 60 %
82 86 90 Vrms
94 97 100 Vrms
Thermal Protection
Thermal Shutdown Threshold
3
Thermal Shutdown Hysteresis T
T
SD
SD(Hy)
130 143 155 ºC
-9-ºC
STBY Input
Logic Threshold
5
Low
High
-
VDD – 0.8
-
-
0.8
-
2.3 Thermal Characteristics
Symbol Parameter Value Unit
θ
R
JA
Thermal Resistance (Junction to Ambient)6.
R
θ
JC
Thermal Resistance (Junction to Case)6.
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, V
, other than 460V, the threshold scales by a factor of V
out
out
159 ºC / W
39 ºC / W
/460
V
4 DS904A6
3. TYPICAL ELECTRICAL PERFORMANCE
0
0.5
1
1.5
2
2.5
3
3.5
0 1 2 3 4 5 6 7 8 9 10111213141516
VDD (V)
I
DD
(mA)
CL = 1 nF
f
SW
= 70 kHz
T
A
= 25 °C
Falling
Rising
7
8
9
10
11
12
13
-50 0 50 100 150
TEMP (oC)
V
DD
(V)
Startup
UVLO
Figure 2. Start-up & UVLO vs. Te mperat ure
Figure 3. UVLO Hysteresis vs. Temperature Figure 4. VDD Zener Voltage vs. TemperatureFigure 3. UVLO Hysteresis vs. Temperature
Figure 1. UVLO Characteristics
0
0.5
1
1.5
2
-50 0 50 100 150
TEMP (oC)
UVLO Hysteresis (V)
17
17.5
18
18.5
19
-50 0 50 100 150
TEMP (oC)
V
Z
(V)
IDD = 20 mA
CS1600
DS904A6 5
CS1600
0
2
4
6
8
10
12
14
-60 -40 -20 0 40 100 120 140
Gate Resistor (ROH, ROL) Temp (oC)
Z
out
(Ohm)
Source
Sink
VDD = 13 V
I
source
= 100 mA
I
sink
= 200 mA
20 60 80
-50 0 50 100 150
TEM P (oC)
Supply Current (mA)
Start-up
Standby
0
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
Operating
VDD = 13 V
C
L
= 1 nF
f
SW
= 70 kHz
Start-up
Standby
Figure 5. Supply Current (ISB, IST, IDD) vs. T emperature Figure 6. Gate Resistance (ROH, ROL) vs. Temperature
6 DS904A6
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