Datasheet LT3756, LT3756-1, LT3756-2 (Analog Devices) - 8
| 制造商 | Analog Devices |
| 描述 | 100VIN, 100VOUT LED Controller |
| 页数 / 页 | 26 / 8 — TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. … |
| 修订版 | C |
| 文件格式/大小 | PDF / 402 Kb |
| 文件语言 | 英语 |
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ISP/ISN Input Bias Current. INTVCC Dropout Voltage
该数据表的模型线
- LT3756EMSE#PBF LT3756EMSE#TRPBF LT3756EMSE#WPBF LT3756EMSE#WTRPBF LT3756EMSE-1#PBF LT3756EMSE-1#TRPBF LT3756EMSE-1#WPBF LT3756EMSE-1#WTRPBF LT3756EMSE-2#PBF LT3756EMSE-2#TRPBF LT3756EMSE-2#WPBF LT3756EMSE-2#WTRPBF LT3756EUD#PBF LT3756EUD#TRPBF LT3756EUD-1#PBF LT3756EUD-1#TRPBF LT3756EUD-2#PBF LT3756EUD-2#TRPBF LT3756HMSE-2#PBF LT3756HMSE-2#TRPBF LT3756HMSE-2#WPBF LT3756HMSE-2#WTRPBF LT3756IMSE#PBF LT3756IMSE#TRPBF LT3756IMSE#WPBF LT3756IMSE#WTRPBF LT3756IMSE-1#PBF LT3756IMSE-1#TRPBF LT3756IMSE-1#WPBF LT3756IMSE-1#WTRPBF LT3756IMSE-2#PBF LT3756IMSE-2#TRPBF LT3756IMSE-2#WPBF LT3756IMSE-2#WTRPBF LT3756IUD#PBF LT3756IUD#TRPBF LT3756IUD-1#PBF LT3756IUD-1#TRPBF LT3756IUD-2#PBF LT3756IUD-2#TRPBF LT3756JMSE-2#PBF LT3756JMSE-2#TRPBF LT3756JMSE-2#WPBF LT3756JMSE-2#WTRPBF
文件文字版本
LT3756/LT3756-1/LT3756-2
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ISP/ISN Input Bias Current INTVCC Dropout Voltage vs CTRL Voltage vs Current, Temperature
40 0 ISP –0.5 –45°C 30 ISN –1.0 25°C 20 –1.5 LDO DROPOUT (V) 125°C 150°C 10 INPUT BIAS CURRENT (µA) –2.0 VIN = 7V 0 –2.5 0 0.5 1 1.5 2 0 3 6 9 12 15 CTRL (V) LDO CURRENT (mA) 375612 G19 375612 G20
PIN FUNCTIONS (MSOP/QFN) PWMOUT (Pin 1/Pin 11):
Buffered Version of PWM Signal
ISN (Pin 3/Pin 13):
Connection Point for the Negative for Driving LED Load Disconnect NMOS or Level Shift. Terminal of the Current Feedback Resistor. If ISN is greater This pin also serves in a protection function for the FB than 2.9V, the LED current can be programmed by ILED = overvoltage condition—wil toggle if the FB input is greater 100mV/RLED when VCTRL > 1.2V or ILED = (VCTRL –100mV)/ than the FB regulation voltage (VFB) plus 60mV (typical). (10 • RLED) when VCTRL ≤ 1V. Input bias current is typi- The PWMOUT pin is driven from INTVCC. Use of a FET with cally 25µA. Below 3V, ISN is an input to the short-circuit gate cut-off voltage higher than 1V is recommended. protection feature that forces GATE to 0V if ISP exceeds
FB (Pin 2/Pin 12):
Voltage Loop Feedback Pin. FB is ISN by more than 150mV (typ). intended for constant-voltage regulation or for LED protec-
ISP (Pin 4/Pin 14):
Connection Point for the Positive tion/open LED detection. The internal transconductance Terminal of the Current Feedback Resistor. Input bias amplifier with output VC will regulate FB to 1.25V (nominal) current is dependent upon CTRL pin voltage as shown through the DC/DC converter. If the FB input is regulating in the TPC. ISP is an input to the short-circuit protection the loop, the OPENLED pull-down is asserted. This ac- feature when ISN is less than 3V. tion may signal an open LED fault. If FB is driven above
VC (Pin 5/Pin 15):
Transconductance Error Amplifier the FB threshold (by an external power supply spike, for Output Pin Used to Stabilize the Voltage Loop with an RC example), the OPENLED pull-down will be de-asserted and Network. This pin is high impedance when PWM is low, a the PWMOUT pin will be driven low to protect the LEDs feature that stores the demand current state variable for from an overcurrent event. Do not leave the FB pin open. the next PWM high transition. Connect a capacitor between If not used, connect to GND. this pin and GND; a resistor in series with the capacitor is recommended for fast transient response. Rev. C 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. ISP/ISN Input Bias Current INTVCC Dropout Voltage vs CTRL Voltage vs Current, Temperature
40 0 ISP –0.5 –45°C 30 ISN –1.0 25°C 20 –1.5 LDO DROPOUT (V) 125°C 150°C 10 INPUT BIAS CURRENT (µA) –2.0 VIN = 7V 0 –2.5 0 0.5 1 1.5 2 0 3 6 9 12 15 CTRL (V) LDO CURRENT (mA) 375612 G19 375612 G20
PIN FUNCTIONS (MSOP/QFN) PWMOUT (Pin 1/Pin 11):
Buffered Version of PWM Signal
ISN (Pin 3/Pin 13):
Connection Point for the Negative for Driving LED Load Disconnect NMOS or Level Shift. Terminal of the Current Feedback Resistor. If ISN is greater This pin also serves in a protection function for the FB than 2.9V, the LED current can be programmed by ILED = overvoltage condition—wil toggle if the FB input is greater 100mV/RLED when VCTRL > 1.2V or ILED = (VCTRL –100mV)/ than the FB regulation voltage (VFB) plus 60mV (typical). (10 • RLED) when VCTRL ≤ 1V. Input bias current is typi- The PWMOUT pin is driven from INTVCC. Use of a FET with cally 25µA. Below 3V, ISN is an input to the short-circuit gate cut-off voltage higher than 1V is recommended. protection feature that forces GATE to 0V if ISP exceeds
FB (Pin 2/Pin 12):
Voltage Loop Feedback Pin. FB is ISN by more than 150mV (typ). intended for constant-voltage regulation or for LED protec-
ISP (Pin 4/Pin 14):
Connection Point for the Positive tion/open LED detection. The internal transconductance Terminal of the Current Feedback Resistor. Input bias amplifier with output VC will regulate FB to 1.25V (nominal) current is dependent upon CTRL pin voltage as shown through the DC/DC converter. If the FB input is regulating in the TPC. ISP is an input to the short-circuit protection the loop, the OPENLED pull-down is asserted. This ac- feature when ISN is less than 3V. tion may signal an open LED fault. If FB is driven above
VC (Pin 5/Pin 15):
Transconductance Error Amplifier the FB threshold (by an external power supply spike, for Output Pin Used to Stabilize the Voltage Loop with an RC example), the OPENLED pull-down will be de-asserted and Network. This pin is high impedance when PWM is low, a the PWMOUT pin will be driven low to protect the LEDs feature that stores the demand current state variable for from an overcurrent event. Do not leave the FB pin open. the next PWM high transition. Connect a capacitor between If not used, connect to GND. this pin and GND; a resistor in series with the capacitor is recommended for fast transient response. Rev. C 8 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts