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PDF DS3992 Data sheet ( Hoja de datos )
| Número de pieza | DS3992 | |
| Descripción | 2-Channel Push Pull CCFL Controller | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 9/06
Two-Channel, Push-Pull CCFL Controller
General Description
The DS3992 is a low-cost, two-channel controller for
cold-cathode fluorescent lamps (CCFLs) that are used
to backlight liquid crystal displays (LCDs). The DS3992
can drive multiple CCFLs per channel, making it ideal
for 4- and 6-lamp LCD PC monitor and TV applications.
The DS3992 uses a push-pull drive scheme to convert a
DC voltage (5V to 24V) to the high voltage (300VRMS to
1400VRMS) AC waveform that is required to power the
CCFLs. The push-pull drive scheme uses a minimal
number of external components, which reduces compo-
nent and assembly cost and makes the printed circuit
board (PC board) design easy to implement. The push-
pull drive scheme also provides an efficient DC-to-AC
conversion and produces near-sinusoidal waveforms.
LCD PC Monitors
LCD-TVs
Applications
Features
o Two-Channel CCFL Controller for Backlighting
LCD Panels for PC Monitors and LCD-TVs
o Minimal BOM Provides Low-Cost Inverter Solution
o Per-Channel Lamp Fault Monitoring for Lamp-
Open, Lamp Overcurrent, Failure to Strike, and
Overvoltage Conditions
o Accurate (±10%) On-Board Oscillator for Lamp
Frequency (40kHz to 80kHz)
o Accurate (±10%) On-Board Oscillator for DPWM
Burst-Dimming Frequency (90Hz to 220Hz or
180Hz to 440Hz)
o Device Supply Undervoltage Lockout
o Inverter Supply Undervoltage Lockout
o Burst-Dimming Soft-Start Minimizes Audible
Transformer Noise
o Strike Frequency Boost
o 100% to < 10% Dimming Range
o 4.5V to 5.5V Single-Supply Operation
o -40°C to +85°C Temperature Range
o 16-Pin SO Package (150 mils)
Ordering Information
PART
TEMP RANGE
DS3992Z-09P+
DS3992Z-09N+
DS3992Z-18P+
DS3992Z-18N+
DS3992Z-09P+T&R
DS3992Z-09N+T&R
DS3992Z-18P+T&R
DS3992Z-18N+T&R
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
+Denotes lead-free package.
T&R denotes tape-and-reel package.
DIMMING
FREQUENCY RANGE
90Hz to 220Hz
90Hz to 220Hz
180Hz to 440Hz
180Hz to 440Hz
90Hz to 220Hz
90Hz to 220Hz
180Hz to 440Hz
180Hz to 440Hz
BRIGHT POLARITY PIN-PACKAGE
Positive
Negative
Positive
Negative
Positive
Negative
Positive
Negative
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
16 SO-16 (150 mils)
Pin Configuration
Typical Operating Circuits appear at end of data sheet.
TOP VIEW
LOSC 1
POSC 2
BRIGHT 3
SVM 4
GA1 5
GB1 6
LCM1 7
OVD1 8
DS3992
SO-150
16 VCC
15 VCC
14 OVD2
13 LCM2
12 GB2
11 GA2
10 VCC
9 GND
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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Two-Channel, Push-Pull CCFL Controller
PIN
NUMBER
1
NAME
LOSC
2 POSC
3 BRIGHT
4 SVM
5 GA1
6 GB1
7 LCM1
8 OVD1
9 GND
10 VCC
11 GA2
12 GB2
13 LCM2
14 OVD2
15 VCC
16 VCC
Pin Description
I/O FUNCTION
⎯
Lamp Oscillator Resistor Adjust. A resistor (RLOSC) to ground on this pin sets the frequency of
the lamp oscillator (fLFS:OSC). [RLOSC x fLFS:OSC = 1.6E9].
Burst Dimming DPWM Oscillator Resistor Adjust. A resistor (RPOSC) to ground on this lead
⎯
sets the frequency (fDSR:OSC) of the burst-dimming DPWM oscillator. [RPOSC x fDSR:OSC = 4.0E6
for DS3992Z-09P and DS3992Z-09N and RPOSC x fDSR:OSC = 8.0E6 for DS3992Z-18P and
DS3992Z-18N].
I
Lamp Brightness Control. An analog voltage at this input controls the lamp brightness. See
Table 1 for details.
Supply Voltage Monitor. The DC inverter supply voltage is monitored by an external resistor
I
divider. The resistor-divider should be set such that it provides 2V at this pin for the minimum
allowable range of the DC inverter supply. Pulling this input below 2V will turn the lamps off and
reset the controller. Connect to VCC if not used.
O
MOSFET Gate Drive A for Channel 1. Connect directly to the gate of a logic-level mode
n-channel MOSFET.
O
MOSFET Gate Drive B for Channel 1. Connect directly to the gate of a logic-level mode
n-channel MOSFET.
I
Lamp Current Monitor Input for Channel 1. Lamp current is monitored by a resistor placed in
series with the low-voltage side of the lamp.
I
Over Voltage Detection for Channel 1. Lamp voltage is monitored by a capacitor divider
placed on the high-voltage side of the lamp.
⎯ Signal Ground
⎯ Supply. 4.5V to 5.5V.
O
MOSFET Gate Drive A for Channel 2. Connect directly to the gate of a logic-level mode
n-channel MOSFET.
O
MOSFET Gate Drive B for Channel 2. Connect directly to the gate of a logic-level mode
n-channel MOSFET.
I
Lamp Current Monitor Input for Channel 2. Lamp current is monitored by a resistor placed in
series with the low-voltage side of the lamp.
I
Overvoltage Detection for Channel 2. Lamp voltage is monitored by a capacitor divider
placed on the high-voltage side of the lamp.
⎯ Supply. 4.5V to 5.5V.
⎯ Supply. 4.5V to 5.5V.
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Two-Channel, Push-Pull CCFL Controller
SVM
DEVICE
SUPPLY VOLTAGE
(5V ±10%)
ANALOG LAMP
BRIGHTNESS
CONTROL
RESISTOR SET
LAMP FREQUENCY
RESISTOR SET
BURST DIMMING
FREQUENCY
DUAL POWER MOSFET
VCC GA1
VCC
VCC
GB1
OVD1
LCM1
BRIGHT
DS3992
DUAL POWER MOSFET
LOSC
POSC
GA2
GB2
OVD2
LCM2
GND
Typical Operating Circuits
Single Per Channel Operating Circuit
INVERTER SUPPLY VOLTAGE
(5V ±10% TO 24V ±10%)
RLCM
1
ILAMP(RMS x 2
TRANSFORMER
RLCM
OVERVOLTAGE DETECTION
LAMP CURRENT MONITOR
CCFL
LAMP
TRANSFORMER
RLCM
OVERVOLTAGE DETECTION
LAMP CURRENT MONITOR
CCFL
LAMP
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____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 13 Páginas | |
| PDF Descargar | [ Datasheet DS3992.PDF ] | |
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