CIRRUS LOGIC CS1600 Service Manual

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

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

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

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

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

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

% of full load as defined by Eq. 3

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

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