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Hello, Please ask a question about L6911E Datasheet
# Example questions:
➢ Describe the soft-start functionality of the l6911e, including the role of the css capacitor and how it impacts the output voltage ramp-up.
➢ What is the primary function of the vid (voltage identification) pins, and how do they affect the output voltage of the l6911e?
➢ How does the l6911e’s driver section adapt to different types of power mosfets, and what mechanisms are in place to prevent cross-conduction?
| Part No. | L6911E |
| Manufacturer | STMICROELECTRONICS |
| Size | 482 Kbytes |
| Pages | 34 pages |
| Description | 5-Bit programmable step down controller with synchronous rectification |
1. Device Overview:
️· The L6911E is an integrated circuit designed for high-performance step-down DC-DC converters, specifically optimized for microprocessor power supplies.
️· It's built using BCD technology.
️· It drives N-Channel MOSFETs in a synchronous rectified buck topology.
️· It operates with Vcc ranging from 5V to 12V.
️· It regulates the output voltage from 1.050V to 1.825V with 25mV steps, with ±1% tolerance.
️· It uses voltage-mode control for fast transient response.
2. Key Features & Functionality:
️· Switching Frequency: 200kHz (fixed), adjustable via external resistor (RT) between 50kHz to 1MHz.
️· Error Amplifier: 15MHz gain-bandwidth product, 10V/ms slew rate for fast response.
️· PWM Duty Cycle: 0% to 100%.
️· Protection: Overcurrent protection with hiccup mode. Current is monitored via the RDS(on) of the upper MOSFET (no current sensing resistor needed).
️· Soft Start: Ramp-up of output voltage using a 10µA current charging an external capacitor.
️· Inhibit: Device shuts down if Vcc or OCSET are below threshold.
️· Driver: High and low-side drivers capable of driving various MOSFETs.
3. Digital to Analog Converter (DAC):
️· Adjusts output voltage using VID (Voltage Identification) pins.
️· Internal reference trimmed for 1% precision.
️· VID code drives an internal DAC to select a voltage from a divider.
️· Internal pull-ups on VID pins (can program "1" by leaving pin floating, "0" by shorting to ground).
️· VID configuration also sets Power-Good and Over-Voltage Protection thresholds.
4. Important Equations & Notes:
️· Switching Frequency (Fs) Adjustments (using RT resistor):
- RT to GND: Fs = 200kHz + (4.94 x 10^-6 / RT)
- RT to Vcc=12V: Fs = 200kHz + (4.306 x 10^-6 / RT)
- RT to Vcc=5V: Fs = 200kHz + (15 x 10^-6 / RT)
️· Soft Start: 10µA charging current for the soft start capacitor.
️· Oscillator: Typical current delivered to oscillator is 50µA. Forcing 50µA into the oscillator will stop switching.
5. Driver Specifications:
️· Low-Side Driver:
- Source peak current: 1.1A @ Vcc=12V, 500mA @ Vcc=5V
- Sink peak current: 1.3A @ Vcc=12V, 500mA @ Vcc=5V
️· High-Side Driver:
- Source peak current: 1.3A @ Vboot-Vphase=12V, 600mA @ Vboot-Vphase=5V
- Sink peak current: 1.3A @ Vboot-Vphase=12V, 550mA @ Vboot-Vphase=5V
1. Device Overview:
️· The L6911E is an integrated circuit designed for high-performance step-down DC-DC converters, specifically optimized for microprocessor power supplies.
️· It's built using BCD technology.
️· It drives N-Channel MOSFETs in a synchronous rectified buck topology.
️· It operates with Vcc ranging from 5V to 12V.
️· It regulates the output voltage from 1.050V to 1.825V with 25mV steps, with ±1% tolerance.
️· It uses voltage-mode control for fast transient response.
2. Key Features & Functionality:
️· Switching Frequency: 200kHz (fixed), adjustable via external resistor (RT) between 50kHz to 1MHz.
️· Error Amplifier: 15MHz gain-bandwidth product, 10V/ms slew rate for fast response.
️· PWM Duty Cycle: 0% to 100%.
️· Protection: Overcurrent protection with hiccup mode. Current is monitored via the RDS(on) of the upper MOSFET (no current sensing resistor needed).
️· Soft Start: Ramp-up of output voltage using a 10µA current charging an external capacitor.
️· Inhibit: Device shuts down if Vcc or OCSET are below threshold.
️· Driver: High and low-side drivers capable of driving various MOSFETs.
3. Digital to Analog Converter (DAC):
️· Adjusts output voltage using VID (Voltage Identification) pins.
️· Internal reference trimmed for 1% precision.
️· VID code drives an internal DAC to select a voltage from a divider.
️· Internal pull-ups on VID pins (can program "1" by leaving pin floating, "0" by shorting to ground).
️· VID configuration also sets Power-Good and Over-Voltage Protection thresholds.
4. Important Equations & Notes:
️· Switching Frequency (Fs) Adjustments (using RT resistor):
- RT to GND: Fs = 200kHz + (4.94 x 10^-6 / RT)
- RT to Vcc=12V: Fs = 200kHz + (4.306 x 10^-6 / RT)
- RT to Vcc=5V: Fs = 200kHz + (15 x 10^-6 / RT)
️· Soft Start: 10µA charging current for the soft start capacitor.
️· Oscillator: Typical current delivered to oscillator is 50µA. Forcing 50µA into the oscillator will stop switching.
5. Driver Specifications:
️· Low-Side Driver:
- Source peak current: 1.1A @ Vcc=12V, 500mA @ Vcc=5V
- Sink peak current: 1.3A @ Vcc=12V, 500mA @ Vcc=5V
️· High-Side Driver:
- Source peak current: 1.3A @ Vboot-Vphase=12V, 600mA @ Vboot-Vphase=5V
- Sink peak current: 1.3A @ Vboot-Vphase=12V, 550mA @ Vboot-Vphase=5V
| Part No. | L6911E |
| Manufacturer | STMICROELECTRONICS |
| Size | 482 Kbytes |
| Pages | 34 pages |
| Description | 5-Bit programmable step down controller with synchronous rectification |
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