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参数资料
| 型号： | LT3825EFE#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 6/32页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO 16-TSSOP |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 88% |
| 电源电压： | 11 V ~ 18 V |
| 降压： | 无 |
| 升压： | 无 |
| 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-TSSOP（0.173"，4.40mm）裸露焊盘 |
| 包装： | 带卷 (TR) |
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LT3825
TYPICAL PERFORMANCE CHARACTERISTICS
Minimum PG On-Time
vs Temperature
PG Delay Time vs Temperature
Enable Delay Time vs Temperature
340
330
320
R tON(MIN) = 158k
300
250
R PGDLY = 27.4k
320
300
R ENDLY = 90k
310
300
200
150
280
260
290
100
R PGDLY = 16.9k
240
280
270
50
220
260
–50
–25
0
25
50
75
100
125
0
–50
–25
0
25
50
75
100
125
200
–50 –25
0
25
50
75
100
125
TEMPERATURE (°C)
PIN FUNCTIONS
3825 G19
TEMPERATURE (°C)
3825 G20
TEMPERATURE (°C)
3825 G21
SG (Pin 1): Synchronous Gate Drive Output. This pin pro-
vides an output signal for a secondary-side synchronous
switch. Large dynamic currents may flow during voltage
transitions. See the Applications Information for details.
V CC (Pin 2): Supply Voltage Pin. Bypass this pin to
ground with a 4.7μF capacitor or more. This pin has a
19.5V clamp to ground. V CC has an undervoltage lockout
function that turns the part on when V CC is approximately
15.3V and off at 9.7V. In a conventional “trickle-charge”
bootstrapped configuration, the V CC supply current
increases significantly during turn-on causing a benign
relaxation oscillation action on the V CC pin if the part does
not start normally.
t ON (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 Applications Information for details.
ENDLY (Pin 4): Pin for external programming resistor to
set enable delay time. The enable delay time disables the
feedback amplifier for a fixed time after the turn-off of the
primary-side MOSFET. This allows the leakage inductance
voltage spike to be ignored for flyback voltage sensing.
See Applications Information for details.
SYNC (Pin 5): Pin for synchronizing the internal oscilla-
tor 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 Applications Information 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 V C pin voltage
cannot exceed the SFST pin voltage, so as SFST increases,
the maximum voltage on V C increases commensurately,
allowing higher peak currents. Total V C 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 defines the controller oscillator frequency. The
frequency is approximately 100kHz ? 100/ C OSC (pF).
FB (Pin 8): Pin for the feedback node for the power supply
feedback amplifier. Feedback is usually sensed via a third
winding and enabled during the flyback period. This pin
also sinks additional current to compensate for load cur-
rent variation as set by the R CMP pin. Keep the Thevenin
equivalent resistance of the feedback divider at roughly 3k.
3525fe
6
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| LT3837EFE#PBF | 功能描述:IC REG CTRLR FLYBK ISO 16-TSSOP 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 |
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