Datasheet LT3751 (Analog Devices) - 7
| Manufacturer | Analog Devices |
| Description | High Voltage Capacitor Charger Controller with Regulation |
| Pages / Page | 34 / 7 — TYPICAL PERFORMANCE CHARACTERISTICS. DCM Trip Voltage (VDRAIN – VTRANS),. … |
| File Format / Size | PDF / 651 Kb |
| Document Language | English |
TYPICAL PERFORMANCE CHARACTERISTICS. DCM Trip Voltage (VDRAIN – VTRANS),. HVGATE Pin Clamp Voltage. RVTRANS = RDCM = 25kΩ
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LT3751
TYPICAL PERFORMANCE CHARACTERISTICS DCM Trip Voltage (VDRAIN – VTRANS), HVGATE Pin Clamp Voltage HVGATE Pin Clamp Voltage RVTRANS = RDCM = 25kΩ
11.0 5.70 0.64 VCC = 24V VCC = 12V VTRANS = 5V CLAMP = 0V CLAMP = 12V VTRANS = 12V 10.9 0.62 VTRANS = 24V 5.65 VTRANS = 48V 10.8 TAGE (V) TAGE (V) TAGE (V) 0.60 10.7 5.60 TE PIN VOL 0.58 10.6 TE PIN VOL HVGA HVGA 5.55 DCM TRIP VOL 10.5 0.56 10.4 5.50 0.54 –40 –20 0 20 40 60 80 100 120 –40 –20 0 20 40 60 80 100 120 –40 0 40 80 120 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3751 G19 3751 G20 3751 G21
PIN FUNCTIONS (TSSOP/QFN) RVTRANS (Pin 1/Pin 19):
Transformer Supply Sense Pin.
UVLO2 (Pin 4/Pin 2):
VCC Undervoltage Lockout Pin. Connect a resistor between the RVTRANS pin and the Senses when VCC drops below: VTRANS supply. Refer to Table 2 for proper sizing of the RVTRANS resistor. The minimum operation voltage for VUVLO2 = 1.225 + 50µA • RUVLO2 VTRANS is 4.75V.
UVLO1 (Pin 2/Pin 20):
V and trips the FAULT latch low, disabling switching. After TRANS Undervoltage Lockout Pin. Senses when V VCC rises above VUVLO2, toggling the CHARGE pin reac- TRANS drops below: tivates switching.
OVLO2 (Pin 5/Pin 3):
VCC Overvoltage Lockout Pin. VUVLO1 = 1.225 + 50µA • RUVLO1 Senses when VCC rises above: and trips the FAULT latch low, disabling switching. After VTRANS rises above VUVLO1, toggling the CHARGE pin VOVLO2 = 1.225 + 50µA • ROVLO2 reactivates switching.
OVLO1 (Pin 3/Pin 1):
V and trips the FAULT latch low, disabling switching. After TRANS Overvoltage Lockout Pin. Senses when V VCC drops below VOVLO2, toggling the CHARGE pin reac- TRANS rises above: tivates switching. VOVLO1 = 1.225 + 50µA • ROVLO1
FAULT (Pin 6/Pin 4):
Open Collector Indication Pin. When either VTRANS or VCC exceeds the user-selected voltage and trips the FAULT latch low, disabling switching. After range, or an internal UVLO condition occurs, a transistor VTRANS drops below VOVLO1, toggling the CHARGE pin turns on. The part will stop switching. This pin needs a reactivates switching. proper pull-up resistor or current source. 3751fd For more information www.linear.com/LT3751 7 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 Typical Applications Package Description Revision History Typical Application Related Parts
TYPICAL PERFORMANCE CHARACTERISTICS DCM Trip Voltage (VDRAIN – VTRANS), HVGATE Pin Clamp Voltage HVGATE Pin Clamp Voltage RVTRANS = RDCM = 25kΩ
11.0 5.70 0.64 VCC = 24V VCC = 12V VTRANS = 5V CLAMP = 0V CLAMP = 12V VTRANS = 12V 10.9 0.62 VTRANS = 24V 5.65 VTRANS = 48V 10.8 TAGE (V) TAGE (V) TAGE (V) 0.60 10.7 5.60 TE PIN VOL 0.58 10.6 TE PIN VOL HVGA HVGA 5.55 DCM TRIP VOL 10.5 0.56 10.4 5.50 0.54 –40 –20 0 20 40 60 80 100 120 –40 –20 0 20 40 60 80 100 120 –40 0 40 80 120 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3751 G19 3751 G20 3751 G21
PIN FUNCTIONS (TSSOP/QFN) RVTRANS (Pin 1/Pin 19):
Transformer Supply Sense Pin.
UVLO2 (Pin 4/Pin 2):
VCC Undervoltage Lockout Pin. Connect a resistor between the RVTRANS pin and the Senses when VCC drops below: VTRANS supply. Refer to Table 2 for proper sizing of the RVTRANS resistor. The minimum operation voltage for VUVLO2 = 1.225 + 50µA • RUVLO2 VTRANS is 4.75V.
UVLO1 (Pin 2/Pin 20):
V and trips the FAULT latch low, disabling switching. After TRANS Undervoltage Lockout Pin. Senses when V VCC rises above VUVLO2, toggling the CHARGE pin reac- TRANS drops below: tivates switching.
OVLO2 (Pin 5/Pin 3):
VCC Overvoltage Lockout Pin. VUVLO1 = 1.225 + 50µA • RUVLO1 Senses when VCC rises above: and trips the FAULT latch low, disabling switching. After VTRANS rises above VUVLO1, toggling the CHARGE pin VOVLO2 = 1.225 + 50µA • ROVLO2 reactivates switching.
OVLO1 (Pin 3/Pin 1):
V and trips the FAULT latch low, disabling switching. After TRANS Overvoltage Lockout Pin. Senses when V VCC drops below VOVLO2, toggling the CHARGE pin reac- TRANS rises above: tivates switching. VOVLO1 = 1.225 + 50µA • ROVLO1
FAULT (Pin 6/Pin 4):
Open Collector Indication Pin. When either VTRANS or VCC exceeds the user-selected voltage and trips the FAULT latch low, disabling switching. After range, or an internal UVLO condition occurs, a transistor VTRANS drops below VOVLO1, toggling the CHARGE pin turns on. The part will stop switching. This pin needs a reactivates switching. proper pull-up resistor or current source. 3751fd For more information www.linear.com/LT3751 7 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 Typical Applications Package Description Revision History Typical Application Related Parts
