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FAN7315
LCD Back Light Inverter Drive IC
Features
* Wide Dimming Range Analog dimming ( 2.5 : 1 ) Burst dimming ( >100 : 1 ) * High Efficiency Single Stage Power Conversion * Wide Input Voltage Range 7.4V to 20V * Back Light Lamp Ballast and Soft Dimming * Few External Components * Precision Voltage Reference Trimmed to 2% * ZVS full-bridge topology * Soft Start * PWM Control at fixed frequency * Analog, Burst Dimming Function * Open Lamp Protection * Open Lamp Regulation * Short Lamp Protection * Thermal Protection * 20 Pin SSOP
Description
The FAN7315 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 250kHz depending on the CCFL and the transformer's characteristics.
20-SSOP
Rev. 1.0.1
(c)2004 Fairchild Semiconductor Corporation
FAN7315
Internal Block Diagram
RT OSCILLATOR Output Driver OUTB CT 5.2uA S_S + + Output Control Logic Output Driver OUTD PGND OUTC OUTA
EA_OUT
Thermal protection + Error Amp.
Q
SET
ADIM EA_IN
R
UVLO
+ + 2V 300mV
OLP
Solr 240uA
Sburst 240uA
Q
CLR
S
SCP
OLR 2V
BCT BDIM AGND
2
+
+ Solr Voltage Reference & Internal Bias Sburst UVLO
2.5VREF
REF
ENA 1.4V VIN VIN UVLO 7.4V
FAN7315
Pin Assignments
SCP
OUTB
OUTA
VIN
PGND
OUTC OUTD
CT
RT
BCT
20
19
18
17
16
15
14
13
12
11
FAN7315
1
OLP
2
OLR
3
ENA
4
S_S
5
AGND
6
REF
7
ADIM
8
BDIM
9
EA_IN
10
EA_OUT
Pin Definitions
No 1 2 3 4 5 6 7 8 9 10 Name OLP OLR ENA S/S AGND V25 ADIM BDIM EA_IN EA_OUT Function Description Open Lamp Protection Open Lamp Regulation Enable Input Soft Start Analog Ground 2.5V Reference Voltage Analog Dimming Input Burst Dimming Input Error Amplifier Input Error Amplifier Output No 11 12 13 14 15 16 17 18 19 20 Name BCT RT CT OUTD OUTC PGND VIN OUTA OUTB SCP Function Description Burst Dimming Timing Capacitor Timing Resistor Timing Capacitor NMOSFET Drive Output D PMOSFET Drive Output C Power Ground Supply Voltage PMOSFET Drive Output A NMOSFET Drive Output B Short Circuit Protection
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FAN7315
Absolute Maximum Ratings
Vcc=12V, for typical values Ta=25C, for min/max values Ta is the operating ambient temperature range with -40C Ta 85C and 7.4V Vcc 20V, unless otherwise specified. Characteristics Supply Voltage Operating Temperature Range Storage Temperature Range Thermal Resistance Junction-Air (Note1,2) Power Dissipation
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
Symbol VCC Topr Tstg RJA Pd
Value 7.4 ~ 20 -40 ~ 85 -65 ~ 150 112 1.1
Unit V C C C/W W
4
FAN7315
Electrical Characteristics
Vcc=12V, for typical values Ta=25C, for min/max values Ta is the operating ambient temperature range with -40C Ta 85C and 7.4V Vcc 20V, unless otherwise specified. Characteristics REFERENCE SECTION Load Regulation Line Regulation 2.5V Regulation Voltage OSCILLATOR SECTION(MAIN) Oscillation Frequency fosc Ta=25C, Ct = 330pF, Rt = 45k Ct = 330pF, Rt = 45k CT High Voltage CT Low Voltage OSCILLATOR SECTION(BURST) Oscillation Frequency BCT High Voltage BCT Low Voltage ERROR AMP SECTION Error Amp Transconductance(Note1) Output Sink Current Output Source Current Open Lamp Regulation Current EA_OUT High Volgate SOFT START SECTION Soft Start Current Soft Start Clamping Voltage PROTECTION SECTION Open Lamp Protection Voltage Open Lamp Regulation Voltage Short Circuit Protection Voltage Thermal Shutdown On Temp.(Note1) TSD Hysterisis(Note1) UNDER VOLTAGE LOCK OUT SECTION Start Threshold Voltage On UVLO Hysteresis Start Up Current Operating Supply Current Stand-by Current Vthon Vhys Ist Iop Isb VCC = Vth-0.2V VCC = 12V VCC = 12V, ENA=0V 5.2 100 48 55 6.3 300 85 80 7.4 500 122 2 105 V mV uA mA uA Volp Volr Vscp TSDon TSDhy 245 1.8 1.75 130 300 2 2 150 30 425 2.2 2.25 170 mV V V C C Iss Vssh S_S=0V 3.5 2.2 5.2 2.55 6.9 2.9 uA V Gm lsin lsur Iolr Vea_outh Va = 1~2.5V EA_OUT = 1V EA_OUT = 1V OLR=2.5V 100 44 33 160 2.2 360 73 50 240 2.5 600 100 67 320 2.8 umho uA uA uA V foscb Vbcth Vbctl Ctb = 6.8nF, Rt=45k 150 191 2 0.5 232 Hz V V Vcth Vbctl 93 89 100 100 1.95 0.5 107 111 kHz kHz V V V25load V25line V25 0 I25 3mA 7.4V VCC 20V 2.44 2 2 2.49 25 25 2.54 mV mV V Symbol Test Condition Min. Typ. Max. Unit
5
FAN7315
Electrical Characteristics (Continued)
Vcc=12V, for typical values Ta=25C, for min/max values Ta is the operating ambient temperature range with -40C Ta 85C and 7.4V Vcc 20V, unless otherwise specified. Characteristics ON/OFF SECTION Off State Input Voltage On State Input Voltage OUTPUT SECTION PMOS Gate High Voltage PMOS Gate Low Voltage NMOS Gate High Voltage NMOS Gate Low Voltage PMOS Gate Voltage With UVLO Activated NMOS Gate Voltage With UVLO Activated Rising Time(Note1) Falling Time(Note1) Max./Min Overlap Min. Overlap between diagonal switches(Note1) Max. Overlap betwwen diagonal switches(Note1) Delay Time PDR_A/NDR_B(Note1) PDR_C/NDR_D(Note1) fosc=100KHz, Rt=45k fosc=100KHz, Rt=45k 325 325 ns ns fosc=100KHz fosc=100KHz 0 100 % % Vpdhv Vpdlv Vndhv Vndlv Vpuv Vnuv Tr Tf VCC =12V VCC =12V VCC = 12V VCC =12V VCC = Vth-0.5V VCC = Vth-0.5V VCC = 12V, Cload=1700pF VCC = 12V, Cload=1700pF Vcc-0.2 100 100 Vcc7.25 5.55 Vcc Vcc-6.5 6.5 Vcc5.55 7.25 0.2 0.2 300 300 ns ns V V V Voff Von 2.1 0.7 V V Symbol Test Condition Min. Typ. Max. Unit
Note: 1. These parameters, although guaranteed, are not 100% tested in production.
6
FAN7315
Mechanical Dimensions
Package Dimensions in millimeters
20-SSOP
7
FAN7315
Ordering Information
Product number FAN7315G Package 20-SSOP Operating Temperature -40C ~ 85C
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. 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.
www.fairchildsemi.com 10/6/04 0.0m 001 Stock#DSxxxxxxxx (c) 2002 Fairchild Semiconductor Corporation
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.

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