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参数资料
| 型号： | LT3837IFE#TRPBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 110 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | 4.40 MM, LEAD FREE, PLASTIC, TSSOP-16 |
| 文件页数： | 25/28页 |
| 文件大小： | 247K |
| 代理商： | LT3837IFE#TRPBF |
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LT3837
6
3837fc
TEMPERATURE (°C)
–50
MINIMUM
ENABLE
TIME
(ns)
220
240
260
25
75
3837 G20
200
180
–25
0
50
100
125
160
140
RENDLY = 90k
TEMPERATURE (°C)
–50
0
t PGDLY
(ns)
50
150
200
250
0
50
75
3837 G19
100
–25
25
100
125
300
RPGDLY = 16.9k
RPGDLY = 27.4k
PIN FUNCTIONS
TYPICAL PERFORMANCE CHARACTERISTICS
SG (Pin 1): Synchronous gate drive output. This pin pro-
vides an output signal for a secondary-side synchronous
switch. Large dynamic currents may ow during voltage
transitions. See the Applications Information section for
details.
VCC (Pin 2): Supply voltage pin. Bypass this pin to ground
with a 4.7μF capacitor or more.
tON (Pin 3): Pin for external programming resistor to set
the minimum time that the primary switch is on for each
cycle. Minimum turn-on facilitates the isolated feedback
method. See the Applications Information section for
details.
ENDLY (Pin 4): Pin for external programming resistor to
set enable delay time. The enable delay time disables the
feedback amplier for a xed time after the turn-off of the
primary-side MOSFET. This allows the leakage inductance
voltage spike to be ignored for yback voltage sensing.
See the Applications Information section for details.
SYNC (Pin 5): Pin for synchronizing the internal oscillator
with an external clock. The positive edge on a pulse causes
the oscillator to discharge causing PG to go low (off) and
SG high (on). The sync threshold is typically 1.53V. See
the Applications Information section for details. Tie to
ground if unused.
SFST (Pin 6): This pin, in conjunction with a capacitor to
ground, controls the ramp-up of peak primary current as
sensed through the sense resistor. This is used to control
converter inrush current at start-up. The VC pin voltage
cannot exceed the SFST pin voltage, so as SFST increases,
the maximum voltage on VC increases commensurately,
allowing higher peak currents. Total VC ramp time is ap-
proximately 70ms per μF of capacitance. Leave pin open
if not using the soft-start function.
OSC (Pin 7): This pin in conjunction with an external
capacitor denes the controller oscillator frequency. The
frequency is approximately 100kHz 100/COSC(pF).
FB (Pin 8): Pin for the feedback node for the power supply
feedback amplier. Feedback is sensed via a transformer
winding and enabled during the yback period. This pin
also sinks additional current to compensate for load current
variation as set by the RCMP pin. Keep the Thevenin equiva-
lent resistance of the feedback divider at roughly 3k.
PG Delay Time vs Temperature
Enable Delay Time vs Temperature
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| LT3844EFE#PBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT3844EFE#TRPBF | 功能描述:IC REG CTRLR BST INV PWM 16TSSOP 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) |
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