L6565B

1/11

L6565B

January 2009 s CURRENT MODE CONTROL

s BUILDIN UP TO 500V HIGH VOTAGE STARTUP s NON-AUDIBLE-NOISE GREEN MODE CONTROL

s

PULSE-BY-PULSE & HICCUP-MODE OCP s ULTRA-LOW START-UP (< 30μA) AND QUIESCENT CURRENT (< 3.5mA)

s 1% PRECISION (@ T j = 25°C) INTERNAL REFERENCE VOLTAGE

s ±400mA TOTEM POLE GATE DRIVER WITH UVLO PULL-DOWN

s BLUE ANGEL, ENERGY STAR, ENERGY 2000 COMPLIANT APPLICATIONS

s TV/MONITOR SMPS

s AC-DC ADAPTERS/CHARGERS s DIGITAL CONSUMER

s PRINTERS, FAX MACHINES,

PHOTOCOPIERS AND SCANNERS

DESCRIPTION

The L6565B is a current-mode primary controller IC,specifically designed to build offline Green Mode fly-back converters.

GREEN MODE SMPS CONTROLLER

BLOCK DIAGRAM

L6565B

2/11

DESCRIPTION (continued)

Converter's power capability variations with the mains voltage are compensated by line voltage feedforward.At light load the device features a special function that automatically lowers the operating frequency to reduce the switch lose and audible noise avoid. In addition to low start-up and quiescent currents, this feature helps keep low the consumption from the mains at light load and be Blue Angel and Energy Star compliant.The IC includes also a disable function, an on-chip filter on current sense, an error amplifier with a precise ref-erence voltage for primary regulation and an effective two-level overcurrent protection.

PIN DESCRIPTION

N°

Name

Function

1 OSC

2COMP Feedback pin,Connecting a photo-coupler to close the control loop and achieve the regulation.

3 CS

Input to the PWM comparator. The primary current is sensed through a resistor, the resulting voltage is applied to this pin and compared with an internal reference to determine MOSFET’s turn-off. The internal reference is clamped at a value, which defines the pulse-by-pulse current limitation setpoint.

4 GND Ground. Current return for both the signal part of the IC and the gate driver.

5 GD Gate driver output. The totem pole output stage is able to drive power MOSFET’s and IGBT’s with a peak current of 400 mA (source and sink).

6 Vcc

Supply Voltage of both the signal part of the IC and the gate driver. An electrolytic capacitor is Connected between this pin and ground.

Oscillator pin. a resistor connected from the pin to GND (pin 3) defines OSC frenqency.

7 NC NOT CONNECTED

8HV

rectified mains voltage. A 1 mA internal current source charges the capacitor connected between Vcc pin (5) and GND pi n until the voltage on the Vcc pin reaches the turn-on threshold, then it is shut down.

High-voltage start-up. The pin, able to withs tand 500 V , is to be tied directly to the

3/11

L6565B

THERMAL DATA

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter

SO8Minidip Unit R th j-amb

Max. Thermal Resistance, Junction-to-ambient

150

100

°C/W

Symbol Pin Parameter

Value Unit I Vcc 6

I CC + I Z

30mA I GD 5 Output Totem Pole Peak Current (2 μs)±400mA ICOMP , CS,OSC 1, 2, 3 Analog Inputs & Outputs

-0.3 to 7

V

T j Junction Temperature Operating range -40 to 150°C T stg

Storage Temperature

-55 to 150

°C

ELECTRICAL CHARACTERISTCS

(T j = -25 to 125°C, V CC = 12V, C o = 1nF; unless otherwise specified)

Symbol

Parameter

Test Condition

Min.

Typ.

Max.

Unit

SUPPLY VOLTAGE V cc Operating range After turn-on

11 25V CCOn Turn-on threshold 12.513.514.5V V CCOff Turn-off threshold 8.79.510.3V Hys Hysteresis 3.65

4

4.3

V

V Z Zener Voltage I cc = 25 mA 30 32 33 V SUPPLY CURRENT

I start-up Start-up Current Before turn-on, V CC = 12V 4570μA I q Quiescent Current After turn-on 2.3 3.5mA I CC Operating Supply Current @ 65 kHz

3.5

5mA I q Quiescent Current During Hiccup-mode OCP 1.6

3.5mA I q

Quiescent Current

V CC >V CCOff

1.4

2.1

mA

OSCILLATOR (OSC PIN)

Operating frequency RT=100K

63 65 67 KHz

Stability

Operating frequency stability V COMP

= 2.35V

20COMP PIN

comp pin open T amb = 25°12V < V CC < 25V 5.8 6.0 6.2

Leading eadge blank time Vcc = 12 to 25V 280 300 320 nS

Green mode threshold 8 HV Max. input votage 500 V

HV open loop voltage LEB

-40 to 150°C

3%

Greenmode Green mode Operating frequency 1921 KHz

Greenmode = 25°C

2.265

2.35 2.435

V

amb T 5.8 6.0 6.2Frequency

L6565B

ELECTRICAL CHARACTERISTCS (continued)

(T j = -25 to 125°C, V CC = 12V, C o = 1nF; unless otherwise specified)

Parameters guaranteed by design, not tested in production.

4/11

L6565B

Figure 1. Supply current vs. Supply voltage Figure 2. Start-up & UVLO vs. Temperature Figure 3. Feedback reference vs. Temperature Figure 4. HV current vs temp.

Figure 5. Pin 2 (COMP) V-I characteristics Figure 6. CS blanking time vs. COMP voltage

HV CURRENT SOURCE(mA)

0.7

0.8

0.9

1.0

1.1

5/11

L6565B

6/11

Figure 7. Gate-drive output saturation Figure 8. Gate-drive output saturation

Figure 9. IC consumption vs. temperature

Figure 10. Zener voltage at Vcc pin vs. Tj

Figure 11. Start-up timer period vs. Tj

L6565B

7/11

TYPICAL APPLICATIONS

Figure 20. 40W Wide Range Mains SMPS for inkjet printer

with f in kHz and R T in k Ω

osc

L6565B

APPLICATION IDEAS

Here follows a series of ideas/suggestions aimed at either improving performance or solving common applica-tion issues of L6565B-based power supplies.

Figure 21. Enhanced turn-off for big MOSFET's drive

Figure 22. Latched shutdown on: a) feedback disconnection; b) overload or short circuit

8/11

L6565B

9/11

L6565B

10/11

L6565B

11/11