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参数资料
| 型号： | LTC3705EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/20页 |
| 文件大小： | 0K |
| 描述： | IC CTRLR OCP 16SSOP |
| 标准包装： | 100 |
| 输出隔离： | 隔离 |
| 输入电压： | 18 V ~ 80 V |
| 输出电压： | 11V |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
LTC3705
PI FU CTIO S
GND (Pin 1): Signal Ground.
I S (Pin 2): Input to the Overcurrent Comparator. Connect
to the positive terminal of a current-sense resistor in
series with the source of the ground-referenced bottom
MOSFET.
V SLMT (Pin 3): Volt-Second Limit. Form an R-C integrator
by connecting a resistor from V IN to V SLMT and a capacitor
from V SLMT to ground. The gate drives are turned off when
the voltage on the V SLMT pin exceeds 1.25V.
UVLO (Pin 4): Undervoltage Lockout. Connect to a resis-
tive voltage divider to monitor input voltage V IN . Enables
converter operation for V UVLO > 1.242V. Hysteresis is a
fixed 16mV hysteresis voltage with a 4.9 μ A hysteresis
current that combines with the Thevenin resistance of the
divider to set the total UVLO hysteresis voltage. This input
also senses V IN for voltage feedforward. Finally, this pin
can be used for external run/stop control.
SSFLT (Pin 5): Combination Soft-Start and Fault Indica-
tor. A capacitor to GND sets the duty cycle ramp-up rate
during start-up. To indicate a fault, the SSFLT pin is
momentarily pulled up to within 1.3V of V CC .
NDRV (Pin 6): Drive for the External NMOS of the Linear
Regulator. Connect to the gate of the NMOS and connect
a pull up resistor to the input voltage V IN . Optionally, to
create a trickle charger omit the NMOS device and connect
NDRV to V CC .
FB/IN + (Pin 7): This pin has several functions. The two
terminals of one pulse transformer winding are connected
to the FB/IN + and FS/IN – pins. The other pulse transformer
winding is connected to the LTC3706. The LTC3705
automatically detects when the LTC3706 applies a pulse-
encoded signal to the FB/IN + and FS/IN – pins and decodes
duty cycle information for control of the primary-side gate
drives (see Operation below). In secondary-side control,
primary-side gate drive bias power is also extracted from
the FB/IN + and FS/IN – pins using an on-chip full-wave
rectifier.
For primary-side control connect this pin to an optoisolator
for feedback control of converter output voltage using an
internal optoisolator biasing network.
FS/IN – (Pin 8): This pin has several functions. Place a
resistor from this pin to GND to set the oscillator fre-
quency. For secondary-side control with the LTC3706,
connect one winding of the pulse transformer for opera-
tion as described for the FB/IN + pin above.
PGND (Pin 9): Supply Return for the Bottom Gate Driver
and the On-Chip Bridge Rectifier.
BG (Pin 10): Bottom Gate Driver. Connect to the gate of the
“low side” external MOSFET.
V CC (Pin 11): Main V CC Power for All Driver and Control
Circuitry.
NC (Pins 12, 13): Voltage Isolation Pins. No connection.
Provided to allow adequate clearance between high-volt-
age pins (BOOST, TG, and TS) and the remainder of the
pins.
BOOST (Pin 14): Top Gate Driver Supply. Connect to V CC
with a diode to supply power to the “high side” external
MOSFET and bypass with a capacitor to TS.
TG (Pin 15): Top Gate Driver. Connect to the gate of the
“high side” external MOSFET.
TS (Pin 16): Supply Return for the Top Gate Driver.
Connect to the source of the “high side” external MOSFET.
3705fb
6
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| LTC3705IGN | 制造商:Linear Technology 功能描述:Forward Controller and Gate Driver 16-Pin SSOP N |
| LTC3705IGN#PBF | 功能描述:IC CTRLR OCP 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:- 标准包装:3,000 系列:- 输出隔离:隔离 频率范围:61kHz ~ 71kHz 输入电压:9.4 V ~ 28 V 输出电压:12V 功率（瓦特）:- 工作温度:-40°C ~ 125°C 封装/外壳:SC-74，SOT-457 供应商设备封装:6-TSOP 包装:带卷 (TR) |
| LTC3705IGN#TRPBF | 功能描述:IC CTRLR OCP 16SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - AC-DC 转换器，离线开关 系列:- 标准包装:3,000 系列:- 输出隔离:隔离 频率范围:61kHz ~ 71kHz 输入电压:9.4 V ~ 28 V 输出电压:12V 功率（瓦特）:- 工作温度:-40°C ~ 125°C 封装/外壳:SC-74，SOT-457 供应商设备封装:6-TSOP 包装:带卷 (TR) |
| LTC3706EGN#PBF | 功能描述:IC SECONDARY SIDE CTRLR 24SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:PolyPhase® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
| LTC3706EGN#TRPBF | 功能描述:IC SECONDARY SIDE CTRLR 24SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 电源控制器，监视器 系列:PolyPhase® 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:2,500 系列:- 应用:多相控制器 输入电压:- 电源电压:9 V ~ 14 V 电流 - 电源:- 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:40-WFQFN 裸露焊盘 供应商设备封装:40-TQFN-EP（5x5） 包装:带卷 (TR) |
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