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参数资料
| 型号： | 750108 |
| 厂商： | Wurth Electronics Inc |
| 文件页数： | 6/30页 |
| 文件大小： | 0K |
| 描述： | BOARD EVAL FOR LT3748 |
| 设计资源： | LT3748 Design Schematic/Tips |
| 标准包装： | 1 |
| 主要目的： | DC/DC，步降 |
| 输出及类型： | 1，隔离 |
| 功率 - 输出： | 30W |
| 输出电压： | 12V |
| 电流 - 输出： | 2.5A |
| 输入电压： | 22 ~ 75 V |
| 稳压器拓扑结构： | 回扫 |
| 板类型： | 完全填充 |
| 已供物品： | 板 |
| 已用 IC / 零件： | LT3748 |
| 相关产品： | LT3748HMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748HMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748IMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748IMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748EMS#TRPBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP LT3748EMS#PBF-ND - IC REG CTRLR FLYBK ISO CM 16MSOP |
| 其它名称： | 732-3308 |
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LT3748
PIN FUNCTIONS
V IN (Pin 1) Input Voltage. This pin supplies current to the
internal start-up circuitry and is the reference voltage for
the feedback circuitry connected to the R FB pin. This pin
must be locally bypassed with a capacitor.
EN/UVLO (Pin 3): Enable/Undervoltage Lockout. A resistor
divider connected to V IN is tied to this pin to program the
minimum input voltage at which the LT3748 will operate.
At a voltage below ~0.5V, the part draws less than 1μA
quiescent current. When below 1.223V but above ~0.5V,
the part will draw quiescent current but will not regulate
the INTV CC supply or power the gate drive circuitry. Above
1.223V, all internal circuitry will start and the SS pin will
source 5μA. When EN/UVLO falls below 1.223V, 2.4μA is
sunk from the pin to provide programmable hysteresis
for undervoltage lockout.
INTV CC (Pin 5): Gate Driver Bias Voltage. This pin supplies
current to the internal gate driver circuitry of the LT3748.
The INTV CC pin must be locally bypassed with a capacitor.
This pin may also be connected to V IN if a third winding
is not used and if V IN ≤ 20V. If a third winding is used, the
INTV CC voltage should be lower than the input voltage for
proper operation.
GATE (Pin 6): N-Channel MOSFET Gate Driver Output.
Switches between INTV CC and GND.
SENSE (Pin 7): The Current Sense Input for the Control
Loop. Kelvin connect this pin to the positive terminal of
the switch current sense resistor, R SENSE , in the source
of the N-channel MOSFET. The negative terminal of the
GND (Pins 8, 9): Ground.
SS (Pin 10): Soft-Start Pin. This pin delays start-up and
clamps V C pin voltage. Soft-start timing is set by the size
of the external capacitor at the pin. Switching starts when
V SS reaches ~0.65V.
V C (Pin 11): Compensation Pin for the Internal Error
Amplifier. Connect a series RC from this pin to ground to
compensate the switching regulator. A 100pF capacitor in
parallel helps eliminate noise.
TC (Pin 12): Output Voltage Temperature Compensation.
Connect a resistor to ground to produce a current pro-
portional to absolute temperature to be sourced into the
RREF node. I TC = 0.55V/R TC .
R REF (Pin 14): Input Pin for the External Ground-Referred
Reference Resistor. The resistor at this pin should be 6.04k,
but for convenience in selecting a resistor divider ratio,
the value may range from 5.76k to 6.34k. The resistor
should be as close to the LT3748 as possible .
R FB (Pin 16): Input Pin for the External Feedback Resistor.
This pin is connected to the transformer primary at the
external MOSFET power switch. The ratio of this resistor
to the R REF resistor, times the internal bandgap reference,
determines the output voltage (plus the effect of any
non-unity transformer turns ratio). The average current
through this resistor during the flyback period should be
approximately 200μA. The resistor should be as close
to the LT3748 as possible .
current sense resistor should be connected to the GND
plane close to the IC.
3748fa
6
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