FAN7300 FAIRCHILD | Alldatasheet

Document overview

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Technical content

Features

  • High Efficiency Single Stage Power Conversion
  • Wide Input V oltage Range 6V to 25V
  • Back Light Lamp Ballast and Soft Dimming
  • Few External Components
  • Precision V oltage Reference Trimmed to 2%
  • S o f t S t a r t
  • PWM and PFM Control
  • Analog, Burst and Mixed Dimming Function
  • Allows All N-Channel MOSFET Drive
  • Double Pulse Suppression Logic
  • Open Lamp Detection
  • Output Short Circuit Protection
  • Open Lamp Regulation
  • 20 Pin SSOP

Description

The FAN7300 provides all the control functions for a series parallel resonant converter and also contains a pulse width modulation (PWM) controller to develop a supply voltage. Typical operating frequency range is between 30kHz and 100kHz depending on the CCFL and the transformer's characteristics. 20-SSOP FAN7300 FAN7300 FAN7300 FAN7300 LCD Back Light Inverter Drive ICLCD Back Light Inverter Drive ICLCD Back Light Inverter Drive ICLCD Back Light Inverter Drive IC

Dimming control and Mode Selection Analog Burst Mixed 50K 50K DIM OLR S_S EA_OUT Va Vm2 Vmo Multiplier Gain Buffer Vm1 K Low side gate driverClock Main Control Oscillator R S + Q Q max. 1.75V min. 0.25V UVLO +Vcc Internal Bias 1.5Vref Vz 5.4V ENA OUT_L GND CPUMP Ct Rt OLP SCP RS Q BCt Vb Va Current Generator E/A Controller Error Amp. COMP3 COMP1 COMP2 COMP4 COMP5 COMP6 COMP7 1.5V 1.5V 1.5V 3.7V Vz 2uA EA_IN VS OUT_H DIM_MODE VZ 3.7V max. 1.75V min. 0.25V High side gate driver Vz 8uA V33V

No Name Function Description No Name Function Description

1 OLP Open Lamp Protection 11 OUT_H High Side Gate Drive Output

2 Rt Timing Resistor 12 CPUMP Charge Pump

3 Ct Timing Capacitor 13 VZ Zener Voltage

4 BCt Burst Dimming Timing Capacitor 14 OLR Open Lamp Regulation

5 S_S Soft Start 15 SCP Short Circuit Protection

6 ENA Enable Input 16 EA_IN Error Amplifier Input

7 VS Voltage Sensing 17 EA_OUT Error Amplifier Output

8 VCC Supply Voltage 18 DIM Dimming Input

9 GND Ground 19 DIM_MODE Dimming Mode Selection

10 OUT_L Low Side Gate Drive Output 20 V3 3V Reference Voltage

20 19 18 17 16 15 14 13 12 11 10987654321 OLP Rt Ct BCt SCP ENA VS VCC GND OUT_L DIM_MODEDIM EA_OUTEA_IN OLR VZ CPUMP OUT_H S_S

Vcc=10V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 85°C and 6V ≤ Vcc ≤ 25V, unless otherwise specified. Note: 1. Thermal resistance test board Size: 76.2mm * 114.3mm * 1.6mm(1S0P) JEDEC standard: JESD51-3, JESD51-7 2. Assume no ambient airflow Characteristics Symbol Value Unit Supply Voltage V CC 6 ~ 25 V Operating Temperature Range Topr -25 ~ 85 °C Storage Temperature Range Tstg -65 ~ 150 °C Thermal Resistance Junction-Air (Note1,2) R θJA 112 °C/W Power Dissipation Pd 1.1 W

Electrical Characteristics

Vcc=10V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 85°C and 6V ≤ Vcc ≤ 25V, unless otherwise specified. Characteristics Symbol Test Condition Min. Typ. Max. Unit REFERENCE SECTION Reference Voltage Vref - 1.46 1.5 1.54 V Line Regulation ∆Vref 8 ≤ VCC ≤ 20V - 2 25 mV 3V Regulation Voltage V3 - 2.86 2.96 3.06 V OSCILLATOR SECTION(MAIN) Oscillation Frequency fosc Ct = 330pF, Rt = 14k 75 95 115 kHz CT High Voltage Vcth - - 1.75 - V CT Low Voltage Vbct1 - - 0.25 - V OSCILLATOR SECTION(BURST) Oscillation Frequency fosc Ctb = 180nF 125 170 205 Hz BCT High Voltage Vbcth - - 1.75 - V BCT Low Voltage Vbct1 - - 0.25 - V ERROR AMP SECTION Feedback Output High Voltage Veh EA_IN = 0V 3.2 3.7 4.2 V Output Sink Current lsin EA_OUT = 2.2V - - -1 mA Output Source Current lsur EA_OUT = 2.2V 1 - - mA Feedback High Voltage On Burst Dimming Vfbh R(EA_IN) = 50k Ω Va+0.1 Va+0.4 Va+0.7 V MULTIPLIER SECTION Multiplier Input Voltage High Vmih - 1.4 1.6 1.8 V Multiplier Gain K - - 0.85 - 1/V SOFT START SECTION Soft Start Current I SS S_S=2V 5 8.3 11.6 uA Soft Start Clamping Voltage Vssh - 3 3.7 4.4 V PROTECTION SECTION Open Lamp Protection Voltage Vpr - 2.5 3 3.5 V Short Circuit Protection Voltage Vsc - 2.5 3 3.5 V Open Lamp Regulation Vor - 2.5 3 3.5 V

Electrical Characteristics (Continued) Vcc=10V, for typical values Ta=25°C, for min/max values Ta is the operating ambient temperature range with -25°C ≤ Ta ≤ 85°C and 6V ≤ Vcc ≤ 25V, unless otherwise specified. Characteristics Symbol Test Condition Min. Typ. Max. Unit DIMMING SECTION Analog Dimming Range Vaal Dim_Mode > 2V, Dim = 0 -0.5 0 0.5 V Vaah Dim_Mode > 2V, Dim = 3V 2.5 3 3.5 V Vba Dim_Mode > 2V - 3 - V Burst Dimming Range Vbbl Dim_Mode < 1V, Dim = 0 -0.5 0 0.5 V Vbbh Dim_Mode < 1V, Dim = 3V 2.1 2.5 2.9 V Vab Dim_Mode < 1V 2.45 2.85 3.25 V Mixed Dimming Range Vaml Dim_Mode = 1.5V, Dim = 0 1.2 1.4 1.6 V Vamh Dim_Mode = 1.5V, Dim = 3V 2.5 3 3.5 V Vbml Dim_Mode = 1.5V, Dim = 0 -0.5 0 0.5 V Vbmh Dim_Mode = 1.5V, Dim = 3V 2.5 3 3.5 V Analog Dimming Select Voltage Vsa - 1.5 2 2.5 V Burst Dimming Select Voltage Vsb - 0.7 1 1.3 V Mixed Dimming Select Voltage Vsm - 1.3 1.5 1.7 V UNDER VOLTAGE LOCK OUT SECTION Start Threshold Voltage Vth - 4.8 5.4 6.0 V Start Up Current Ist V CC = 4.5V - 150 250 uA Operating Supply Current Iop V CC = 10V - 8.5 11 mA Stand-by Current Isb V CC = 12V - 80 150 uA ON/OFF SECTION On State Input Voltage Von - 0.7 - - V OUTPUT SECTION Output High Voltage Voh V CC = 7V 5 - - V Output Low Voltage Vol V CC = 7V - - 0.2 V Output Voltage With UVLO Activated Vuv V CC = 4.5V - - 0.9 V Output High Clamping Voltage Vohc V CC = 20V 11 13.5 16 V Rising Time Tr V CC = 7V - 100 200 ns Falling Time Tf V CC = 7V - 50 200 ns

Figure 19. Output Sink Current Figure 20. Output Source Current

4/22/03 0.0m 001 Stock#DSxxxxxxxx  2002 Fairchild Semiconductor Corporation LIFE SUPPORT POLICY FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.

Ordering Information

Product number Package Operating Temperature FAN7300G 20-SSOP -25 °C ~ 85°C