MAX1739EVKIT Maxim Integrated Products, MAX1739EVKIT Datasheet - Page 6

• Manufacturer Part Number: MAX1739EVKIT
• Description: Power Management Modules & Development Tools MAX1739 EVAL KIT MAX1739 EVAL KIT
• Manufacturer: Maxim Integrated Products

Specifications of MAX1739EVKIT

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

R13 is an 85Ω resistor and sets the lamp current to
approximately 6mA
the lamp current is dependent on the lamp characteris-
tics. Adjust R13 as needed to achieve the desired lamp
current for the CCFL of interest. Refer to the Sense
Resistors section of the MAX1739 data sheet for deter-
mining the values.
In order to achieve the narrow form factor required by
many of today’s notebook CCFL solutions, the EV kit
MAX1739 Evaluation System/
Evaluation Kit
Table 2. Jumper Settings Description
6
Coiltronics
TDK
Toko
JUMPER
_______________________________________________________________________________________
JU1
JU2
JU3
JU4
JU5
JU6
LOCATION
SHUNT
Closed
Open
Open
1-2
1-3
1-4
1-2
2-3
1-2
1-3
1-4
1-2
2-3
1-2
2-3
Other Transformer Supplies
RMS
561-241-7876
847-803-6100
847-297-0070
(entering the lamp). However,
Transformer Suppliers
MODE = REF (negative-scale ADC mode), CTL/SCL = 0 results in maximum brightness.
MODE = GND (positive-scale ADC mode), CTL/SCL = 0 results in minimum brightness.
MODE = V
Used for SMBus mode: CRF/SDA connected to VL through a 10kΩ pullup resistor.
MINDAC = VL. Disables the DPWM chopping function.
Used for SMBus mode. SH/SUS is connected to VL through a 10kΩ pullup resistor.
Places the MAX1739 into shutdown.
Used for SMBus mode. CTL/SCL connected to VL through a 10kΩ pullup resistor.
Used for ADC mode. Drive CRF/SDA with an external voltage. The external voltage is the reference
input voltage for the ADC. (JU1 must be in the 1-2 or 1-3 position. JU5 = closed.)
Used for ADC mode. CRF/SDA = VL. VL is the reference input voltage for the ADC. (JU1 must be in
the 1-2 or 1-3 position. JU5 = closed.)
MINDAC ≅ 1V. MINDAC is connected to REF through a voltage-divider formed by R1 and R2. This
voltage sets the DAC’s minimum scale output voltage.
MINDAC = 2V. MINDAC is connected to REF. This voltage sets the DAC’s minimum scale output
voltage.
Used for SMBus mode. Drive CRF/SDA with SMBus data.
Used for ADC mode. Drive CRF/SDA with analog voltage. (Connect JU2 to the 1-2 position to use
VL as the analog voltage.)
Used for ADC mode. CTL/SCL connected to the ADC reference input voltage (CRF/SDA) through
potentiometer R8. Adjusting R8 changes the brightness.
Inductor Tradeoffs
Lamp Current
L
. Enable SMBus interface.
561-241-9339
847-803-6296
847-699-7864
uses a small inductor. However, a 200µH inductor with
the same saturation current rating improves the input
transient response of the circuit.
Table 3. Jumper Settings Quick Reference
JUMPER
FUNCTION
JU1
JU2
JU3
JU4
JU5
JU6
SMBUS
MODE
Open
1-4
2-3
1-2
2-3
X
1-2 or 1-3
Closed
MODE
ADC
1-2
1-2
1-2
X