参数资料
| 型号： | LT1950IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR PWM CM 16-SSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 560kHz |
| 占空比： | 97% |
| 电源电压： | 3 V ~ 25 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LT1950
PI FU CTIO S
BLANK (Pin 9): The BLANK pin is used to adjust the
leading edge blanking period of the current sense amplifier
during FET turn-on. Shorting the BLANK pin to ground
provides a default blanking period of approximately 110ns.
A resistor from the BLANK pin to ground increases the
blanking period up to 290ns for R BLANK = 75k.
I SENSE (Pin 10): The I SENSE pin is the current sense input
for the control loop. Connect this pin to the sense resistor
in the source of the external power MOSFET.
V IN2 (Pin 11): The V IN2 pin is the supply pin for the
MOSFET gate drive circuit. Power can be supplied to this
pin by an external supply such as V IN , and must exceed 8V
(the undervoltage lockout threshold for the gate driver
supply). For low V IN supply voltages an internal boost
regulator can be used to generate as much as 11V at the
V IN2 pin. This allows the LT1950 to run with V IN supply
voltages down to 3V while still supplying enough gate
drive for standard level MOSFETs.
GATE (PIN 12): The GATE pin is the output of a high current
gate drive circuit used to drive an external MOSFET. The
output is actively clamped to a max voltage of 13V if V IN2
is supplied by a high voltage.
PGND (Pin 13): This is the ground connection for the high
current gate driver stage. See the Applications Informa-
tion section for recommendations on ground connec-
BOOST (Pin 14): The BOOST pin is the NPN collector
output of the internal boost converter which can be used
to generate an 11V supply for the MOSFET gate driver
circuit. The boost converter runs with a fixed off-time of
0.5 μ s and a current limit of 125mA. The converter runs
until the V IN2 voltage exceeds 11V and then turns off until
the V IN2 voltage drops below 10V. If the V IN2 voltage is
supplied externally, the BOOST pin should be shorted to
ground or left open.
V IN (Pin 15): The V IN pin is the main supply pin for the
LT1950. This pin must be closely bypassed to ground. If
V IN2 is generated using the BOOST pin then the LT1950
will be fully functional, internal V REF will be active and the
gate output will be enabled with a V IN voltage as low as 3V.
An internal undervoltage lockout threshold exists at ap-
proximately 2.6V on the V IN pin. Undervoltage lockout
voltages greater than 3V can be programmed using a
voltage divider on the SHDN pin.
V SEC (Pin 16): The V SEC pin is used to program the
maximum duty cycle of the gate driver circuit. The maxi-
mum duty cycle will be equal to (105/V SEC )% for V SEC
between 1.4V and 2.8V. This is a useful function to limit the
flyback voltage in a forward converter. If the maximum
duty cycle function is not used then the V SEC pin should be
tied to ground.
tions.
1950fa
7
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相关代理商/技术参数 |
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| LT1952 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2-Phase Step-Up DC/DC Controller |
| LT1952-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Single Switch Synchronous Forward Controller |
| LT1952EGN | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 16-Pin SSOP N |
| LT1952EGN#PBF | 功能描述:IC REG CTRLR ISO PWM CM 16-SSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT1952EGN#TR | 制造商:Linear Technology 功能描述:Current Mode PWM Controller 16-Pin SSOP N T/R |
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