RT8452GS Richtek USA Inc, RT8452GS Datasheet - Page 10

• Manufacturer Part Number: RT8452GS
• Description: IC PWM CTRLR LED DVR 16SOP
• Manufacturer: Richtek USA Inc

Specifications of RT8452GS

• Internal Driver: No
• Type - Primary: Backlight, General Purpose
• Mounting Type: Surface Mount
• Topology: PWM, Step-Down (Buck), Step-Up (Boost)
• Number Of Outputs: 1
• Frequency: 280kHz ~ 420kHz
• Voltage - Supply: 4.5 V ~ 36 V
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Operating Temperature: -

(500mA/Div)
www.richtek.com
10
RT8452
(10V/Div)
(50V/Div)
I
(2V/Div)
OUT
V
V
Gate
EN
OUT
1.21
1.20
1.19
1.18
1.17
1.16
1.15
2.5
2.0
1.5
1.0
0.5
0.0
0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
4
Boost Application, V
8
LED Current vs. ACTL
OVP vs. Input Voltage
12
Power Off from EN
Time (100ms/Div)
Input Voltage (V)
16
ACTL (V)
IN
= 24V, V
20
V
IN
= 24V, R
24
OUT
1
= 48V
SENSE
1.1 1.2 1.3 1.4
28
OVP_H
OVP_L
V
IN
= 65mΩ
32
= 24V
36
(200mA/Div)
(10V/Div)
(20V/Div)
I
(2V/Div)
OUT
V
V
Gate
OUT
EN
1.21
1.20
1.19
1.18
1.17
1.16
1.15
2.5
2.0
1.5
1.0
0.5
0.0
-40 -25 -10
0
DCTL high level is 3V and low level is 0V,
DCTL = 10kHz, V
Boost Application, V
10
LED Current vs. DCTL Duty
20
OVP vs. Temperature
Power On from EN
5
30
Temperature (°C)
Time (250μs/Div)
IN
DCTL Duty (%)
20
DS8452-01
40
= 24V, R
IN
35
= 24V, V
50
50
SENSE
60
OUT
65
OVP_H
September 2010
= 65mΩ
70
= 48V
80
OVP_L
80
95 110 125
V
IN
90
= 24V
100