CAT32TDI-GT3 ON Semiconductor, CAT32TDI-GT3 Datasheet - Page 6

• Manufacturer Part Number: CAT32TDI-GT3
• Description: IC WHITE LED DRIVER TSOT-23-6
• Manufacturer: ON Semiconductor
• Type: Backlight, White LEDr

Specifications of CAT32TDI-GT3

• Topology: PWM, Step-Up (Boost)
• Number Of Outputs: 1
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 800kHz ~ 1.6MHz
• Voltage - Supply: 2 V ~ 7 V
• Mounting Type: Surface Mount
• Package / Case: TSOT-23-6, TSOT-6
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 40mA
• Internal Switch(s): Yes
• Efficiency: 83%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Details

Operation
frequency, current regulating boost converter.
compensated loop for the regulation of the LED current.
diagram. The RSET pin is regulated at 100 mV and the
current through the external resistor will set the regulated
current in the LEDs (from 5 mA to 40 mA) with a
multiplication factor of 225.
Block Diagram
The CAT32 device is a high efficiency, constant
The device includes a switch and an internally
Operation can be best understood by examining the block
V
IN
C 1
5
6
Over Voltage
V
CAT32
SHDN
Protection
IN
(22 V)
L
1
1
SW
Current
Sense
Amp
Figure 14. CAT32 Block Diagram
2
GND
+
−
http://onsemi.com
6
Oscillator
1.2 MHz
& Logic
PWM
automatically adjusts the LED pin voltage to be as low as
possible. A low LED pin voltage ensures high efficiency.
monitored cycle−by−cycle. If the current limit is exceeded,
the switch is immediately turned off, protecting the device,
for the remainder of the cycle.
the SHDN pin or by pulling the RSET pin higher than 0.1 V.
While maintaining LED current regulation, the CAT32
Current through the internal power switch is continuously
PWM dimming operation can be achieved by switching
I
S
4
D
R
1
RSET
100 mV
SET
Current
Control
−
+
225x
I
LED
LED
= 225 x I
3
S
I
LED
C
2