RT8452GS Richtek USA Inc, RT8452GS Datasheet
RT8452GS
Specifications of RT8452GS
Related parts for RT8452GS
RT8452GS Summary of contents
Page 1
High Voltage High Current LED Driver Controller for Buck Boost or Buck-Boost Topology General Description The RT8452 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. With a current sense amplifier threshold ...
Page 2
... RT8452 Marking Information RT8452GS : Product Number RT8452 YMDNN : Date Code GSYMDNN Typical Application Circuit V IN 4.5V to 36V 5V Analog Dimming R VC 10k 0.1µF 3.3nF V IN 4.5V to 36V 5V PWM Dimming control R VC 10k 0.1µF 3.3nF C 1µF Figure 2. PWM to Analog Dimming in Boost Configuration www ...
Page 3
V IN 4.5V to 36V 10µ 10k 0.1µF 3.3nF V IN 4.5V to 36V 5V Analog Dimming R VC 10k 0.1µF VC 3.3nF Analog Dimming R VC ...
Page 4
RT8452 Functional Pin Description Pin No. SOP-16 WQFN-16L 3x3 ...
Page 5
Function Block Diagram EN 1.4V VCC 4.5V OVP 1.18V VC 6µA SS 1.2V DCTL + - DS8452-01 September 2010 8. Shutdown + - S OSC - + 1.2V + ...
Page 6
RT8452 Absolute Maximum Ratings Supply Input Voltage, V ----------------------------------------------------------------------------------------------- CC GBIAS, GATE, PWMDIM, PWMOUT -------------------------------------------------------------------------------- 10V ISW --------------------------------------------------------------------------------------------------------------------------- 1V ISP, ISN ---------------------------------------------------------------------------------------------------------------------- 54V DCTL, ACTL, OVP Pin Voltage ---------------------------------------------------------------------------------------- 8V (Note 6) EN Pin Voltage ------------------------------------------------------------------------------------------------------------- 20V Power Dissipation, P ...
Page 7
Parameter LED Dimming Analog Dimming ACTL Pin Input Current LED Current Off Threshold at ACTL DCTL Input Current PWM Control Switching Frequency Minimum Off Time (Note 5) Switch Gate Driver GBIAS Voltage Gate Voltage High Gate Voltage Low GATE Drive ...
Page 8
RT8452 Note 1. Stresses listed as the above "Absolute Maximum Ratings" may cause permanent damage to the device. These are for stress ratings. Functional operation of the device at these or any other conditions beyond those indicated in the operational ...
Page 9
Typical Operating Characteristics Efficiency vs. Output Current 100 Boost Application 200 400 Output Current(mA) Switching Frequency vs. Input Voltage 400 380 360 340 320 300 Input Voltage (V) Shutdown Current ...
Page 10
RT8452 LED Current vs. ACTL 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 ACTL (V) OVP vs. Input Voltage 1.21 1.20 1.19 1.18 1.17 1.16 1. Input Voltage (V) Power ...
Page 11
Applications Information The RT8452 is a current mode PWM controller designed to drive an external MOSFET for high current LED applications. The LED current can be programmed by an external resistor. The input voltage range of the RT8452 can be ...
Page 12
RT8452 power and switching current when time varying differential voltage signal (ripple) across ISP and ISN at the switching frequency is expected. The amplitude of this signal is increased by high LED load current, low switching frequency ...
Page 13
N-MOSFET and GND of the RT8452. The ISW pin input to RT8452 should be a Kelvin connection to the positive terminal Over Temperature Protection The RT8452 has over temperature protection (OTP) function to prevent the ...
Page 14
RT8452 The maximum power dissipation can be calculated by following formula : − θ D(MAX) J(MAX Where T is the maximum operation junction J(MAX) is the ambient temperature and the θ ...
Page 15
Outline Dimension J I Symbol DS8452-01 September 2010 Dimensions In Millimeters Min Max 9.804 10.008 3.810 3.988 1.346 1.753 0.330 0.508 1.194 1.346 0.178 0.254 0.102 ...
Page 16
RT8452 Symbol Richtek Technology Corporation Headquarter 5F, No. 20, Taiyuen Street, Chupei City Hsinchu, Taiwan, R.O.C. Tel: (8863)5526789 Fax: (8863)5526611 Information that is provided by Richtek ...