CAT3649HV3-GT2 ON Semiconductor, CAT3649HV3-GT2 Datasheet - Page 10

• Manufacturer Part Number: CAT3649HV3-GT2
• Description: LED Drivers 6 channel quad mode LED Driver
• Manufacturer: ON Semiconductor
• Series: QUAD-Mode®r

Specifications of CAT3649HV3-GT2

• Constant Current: -
• Constant Voltage: -
• Topology: PWM, Switched Capacitor (Charge Pump)
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: White LED
• Frequency: 800kHz ~ 1.6MHz
• Voltage - Supply: 2.4 V ~ 5.5 V
• Voltage - Output: -
• Mounting Type: *
• Package / Case: *
• Operating Temperature: -40°C ~ 85°C
• Led Driver Application: Backlighting
• No. Of Outputs: 6
• Output Current: 25mA
• Output Voltage: 7V
• Dimming Control Type: PWM / Analogue
• Operating Temperature Range: -40°C To +85°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Current Selection
initially to the full scale of 25 mA. The number of pulses (n)
on the ADIM input decreases the current value as follows:
with n equal to zero.
enables and disables the device. The other function is LED
current dimming with 32 different levels by pulsing the input
signal, as shown on Figure 28. On each consecutive pulse
rising edge, the LED current is decreased by about 3.1%
(1/32
current is 3.1% of the full scale current (lowest level). On the
following pulse, the LED current goes back to full scale.
Pulses faster than the minimum T
filtered by the device. Pulses longer than the maximum T
may shutdown the device. By pulsing the ADIM signal at
high frequency, the LED current can quickly be set to zero.
ADIM is held low for longer than 30 ms.
ADIM after the power−up, as shown in Table 6.
After power−up and once enabled, the LED current is set
The full scale current is calculated from the above formula
The ADIM pin has two primary functions. One function
Each pulse width should be between 200 ns and 100 ms.
The LED driver enters a “zero current” shutdown mode if
The dimming level is set by the number of pulses on the
th
LED current [mA] + 25
of the full scale value). After 31 pulses, the LED
LO
32 * n
32
may be ignored and
http://onsemi.com
(eq. 1)
LO
10
Table 6. DIMMING LEVELS
LED Current (Typical) [mA]
25.0
24.2
23.4
22.6
21.8
21.0
20.2
19.4
18.6
17.8
17.0
16.2
15.3
14.6
13.8
13.0
12.3
10.7
11.5
9.9
9.1
8.3
7.5
6.7
5.9
5.1
4.3
3.6
2.7
2.0
1.2
0.4
25
Dimming Pulses [n]
10
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
11
0
1
2
3
4
5
6
7
8
9