參數(shù)資料
型號(hào)： LTC3830-1ES8
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 16-Bit Bus Transceiver With 3-State Outputs 56-BGA MICROSTAR JUNIOR -40 to 85
中文描述： SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO8
封裝： 0.150 INCH, PLASTIC, SO-8
文件頁(yè)數(shù)： 11/24頁(yè)
文件大?。?/td> 305K
代理商： LTC3830-1ES8
11
LTC3830/LTC3830-1
sn3830 3830fs
The LTC3830 internal oscillator can be externally synchro-
nized from 100kHz to 500kHz. Frequencies above 300kHz
can cause a decrease in the maximum obtainable duty
cycle as rise/fall time and propagation delay take up a
larger percentage of the switch cycle. Circuits using these
frequencies should be checked carefully in applications
where operation near dropout is important—like 3.3V to
2.5V converters. The low period of this clock signal must
not be >100
μ
s, or else the LTC3830 enters shutdown
mode.
Figure 5 describes the operation of the external synchro-
nization function. A negative transition at the SHDN pin
forces the internal ramp signal low to restart a new PWM
cycle. Notice that with the traditional sync method, the
ramp amplitude is lowered as the external clock frequency
goes higher. The effect of this decrease in ramp amplitude
increases the open-loop gain of the controller feedback
loop. As a result, the loop crossover frequency increases
and it may cause the feedback loop to be unstable if the
phase margin is insufficient.
To overcome this problem, the LTC3830 monitors the
peak voltage of the ramp signal and adjusts the oscillator
charging current to maintain a constant ramp peak.
Input Supply Considerations/Charge Pump
The 16-lead LTC3830 requires four supply voltages to
operate: V
IN
for the main power input, PV
CC1
and PV
CC2
for
MOSFET gate drive and a clean, low ripple V
CC
for the
LTC3830 internal circuitry (Figure 6). The LTC3830-1 and
the 8-lead LTC3830 have the PV
CC2
and V
CC
pins tied
together inside the package (Figure 7). This pin, brought
out as V
CC
/PV
CC2
, has the same low ripple requirements
as the 16-lead part, but must also be able to supply the gate
drive current to Q2.
In many applications, V
CC
can be powered from V
IN
through an RC filter. This supply can be as low as 3V. The
low quiescent current (typically 800
μ
A) allows the use of
relatively large filter resistors and correspondingly small
APPLICATIOU
W
U
U
SHDN
200kHz
FREE RUNNING
RAMP SIGNAL
TRADITIONAL
SYNC METHOD
WITH EARLY
RAMP
TERMINATION
LTC3830
KEEPS RAMP
AMPLITUDE
CONSTANT
UNDER SYNC
RAMP SIGNAL
WITH EXT SYNC
RAMP AMPLITUDE
ADJUSTED
3830 F05
Figure 5. External Synchronization Operation
3830 F6
+
V
CC
PV
CC2
PV
CC1
V
IN
G1
Q1
C
OUT
V
OUT
Q2
L
O
G2
INTERNAL
CIRCUITRY
LTC3830 (16-LEAD)
3830 F7
+
V
CC
/PV
CC2
PV
CC1
V
IN
G1
Q1
C
OUT
V
OUT
Q2
L
O
G2
INTERNAL
CIRCUITRY
LTC3830 (8-LEAD)
Figure 6. 16-Lead Power Supplies
Figure 7. 8-Lead Power Supplies
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3830-1ES8#PBF 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無(wú) 升壓:是 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR)
LTC3830-1ES8#TR 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3830-1ES8#TRPBF 功能描述:IC REG CTRLR BUCK PWM VM 8-SOIC RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:500kHz 占空比:96% 電源電壓:4 V ~ 36 V 降壓:無(wú) 升壓:是 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:24-WQFN 裸露焊盤 包裝:帶卷 (TR)
LTC3830EGN 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:4,500 系列:PowerWise® PWM 型:控制器 輸出數(shù):1 頻率 - 最大:1MHz 占空比:95% 電源電壓:2.8 V ~ 5.5 V 降壓:是 升壓:無(wú) 回掃:無(wú) 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3830EGN#PBF 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標(biāo)準(zhǔn)包裝:2,000 系列:- PWM 型:電流模式 輸出數(shù):1 頻率 - 最大:1MHz 占空比:50% 電源電壓:9 V ~ 10 V 降壓:無(wú) 升壓:是 回掃:是 反相:無(wú) 倍增器:無(wú) 除法器:無(wú) Cuk:無(wú) 隔離:無(wú) 工作溫度:-40°C ~ 85°C 封裝/外殼:8-TSSOP（0.173"，4.40mm 寬） 包裝:帶卷 (TR)
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