LX1692B Просмотр технического описания (PDF) - Microsemi Corporation
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LX1692B Datasheet PDF : 13 Pages
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LX1692B
TM
®
Full Bridge Resonant CCFL Controller
PRODUCTION DATA SHEET
ABSOLUTE MAXIMUM RATINGS
Supply Input Voltage(VDDP)........................................................................................ 6V
VIN_SNS ..................................................................................... -0.3V to VDDP+0.5V
Digital Input (ENABLE)................................................................. -0.3V to VDDP+0.5V
Analog Inputs (ISNS, OV_SNS, OC_SNS)clamped to ±14V Max Peak Current ±100mA
Analog Inputs (BRITE_A, BRITE_D)........................................... -0.3V to VDDP +0.5V
Digital Outputs (AOUT, BOUT, COUT, DOUT).......................... -0.3V to VDDP +0.5V
Analog Outputs (I_R, ICOMP, VCOMP) ..................................... -0.3V to VDDP + 0.5V
Maximum Operating Junction Temperature .............................................................150°C
Storage Temperature Range........................................................................... -65 to 150°C
Peak Package Solder Reflow Temp. (40 seconds maximum exposure)........260°C(+0, -5)
Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to
Ground. Currents are positive into, negative out of specified terminal.
THERMAL DATA
DW Plastic SOIC 20-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
85°C/W
PW Plastic TSSOP 20-Pin
THERMAL RESISTANCE-JUNCTION TO AMBIENT, θJA
99°C/W
Junction Temperature Calculation: TJ = TA + (PD x θJA).
The θJA numbers are guidelines for the thermal performance of the device/pc-board system. All of the
above assume no ambient airflow.
PACKAGE PIN OUT
VDDA
C_R
C_BST
C_TO
I_R
ENABLE
BRITE_A
VIN_SNS
BRITE_D
VCOMP
1
20
10
11
PW PACKAGE
(Top View)
VDDP
AOUT
BOUT
GND
COUT
DOUT
ISNS
OV_SNS
ICOMP
OC_SNS
VDDA
C_R
C_BST
C_TO
I_R
ENABLE
BRITE_A
VIN_SNS
BRITE_D
VCOMP
1
20
2
19
3
18
4
17
5
16
6
15
7
14
8
13
9
12
10
11
DW PACKAGE
(Top View)
VDDP
AOUT
BOUT
GND
COUT
DOUT
ISNS
OV_SNS
ICOMP
OC_SNS
RoHS / Pb-free 100% Matte Tin Lead Finish
Name
C_R
I_R
FUNCTIONAL PIN DESCRIPTION
Description
Lamp Frequency Programming Capacitor Pin – lamp running frequency is set by the combination of C_R and
I_R. The internal lamp current oscillator frequency can be forced to follow an external clock signal at this pin. In
this case, the programmed frequency must be lower than the external frequency. Minimum pulse width for
external synch signal is 1µsec. Maximum duty is 50%
Current Reference Resistor Input. Connects to an external resistor that determines the magnitude of the
internal bias currents. The I_R pin is a DC reference voltage of 1V. This voltage should only be used for its
intended function. The reference current established at this pin, by connecting an external resistor, is used to
charge a capacitor at the C_R pin. The nominal lamp frequency can be adjusted by varying this resistor value in
the range of 20K to 100K Ohms. (Note: C is in pF, R is in KΩ , Freq is in kHz).
FLAMP
=
242 × 103
CC _ R ⋅ RI _ R
Other reference currents derived from I_R are used for the digital dimming burst oscillator and the strike time
out function.
Copyright © 2005
Rev. 1.1, 12/20/2006
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 2
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