 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
LM36922H Datasheet(PDF) 20 Page - Texas Instruments |
|
|
||||||||||||||||||||||||||||||
LM36922H Datasheet(HTML) 20 Page - Texas Instruments |
|
|
20 / 46 page  Ramp Rate ILED_t0- ILED_t1 tRAMP ILED_t0+ t0 t1 PWM Detector Ramper Mapper DAC Driver_1 Driver_2 ILED1 ILED2 I2C Brightness Reg Analog Domain Digital Domain Boost Min VHR VOUT DACi RAMP_EN MAP_MODE PWM Input RAMP_RATE Bits BRT Code = I2C × Duty Cycle 20 LM36922H SNVSAF2A – FEBRUARY 2016 – REVISED FEBRUARY 2016 www.ti.com Product Folder Links: LM36922H Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated Device Functional Modes (continued) Figure 27. Brightness Control 11 (I2C + PWM) 1. At time t0 the I2C Brightness code changed from 0x444 (1092d) to 0x7FF (2047d) 2. At time t0 the PWM duty cycle changed from 50% to 75% 3. Ramp Rate programmed to 1 ms/step 4. Mapping Mode set to Linear 5. ILED_t0– = 1092 × 12.213 µA × 0.5 = 6.668 mA 6. ILED_t0+ = 1092 × 12.213 µA × 0.75 = 10.002 mA 7. tRAMP = (t1 – t0) = 1 ms/step × (2047 – 1092 – 1) = 954 ms Figure 28. Brightness Control Mode 11 Example (Ramp Current Then Multiply Duty Cycle) 7.4.2 Boost Switching Frequency The LM36922H has two programmable switching frequencies: 500 kHz and 1 MHz. These are set via the Boost Control 1 register 0x13 bit [5]. Once the switching frequency is set, this nominal value can be shifted down by 12% via the boost switching frequency shift bit (register 0x13 bit[6]). Operation at 500 kHz is better suited for configurations which use a 10-µH inductor or use the auto-frequency mode and switch over to 500 kHz at lighter loads. Operation at 1 MHz is primarily beneficial at higher output currents, where the average inductor current is much larger than the inductor current ripple. For maximum efficiency across the entire load current range the device incorporates an automatic frequency shift mode (see Auto-Switching Frequency). |
Similar Part No. - LM36922H |
|
Similar Description - LM36922H |
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
