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参数资料
| 型号： | LTC3830-1ES8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 8-SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 250kHz |
| 占空比： | 95% |
| 电源电压： | 3 V ~ 8 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： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
LTC3830/LTC3830-1
TEST CIRCUITS
5V
PV CC
V SHDN V CC
+
10 μ F
0.1 μ F
SHDN
V CC
PV CC2 PV CC1
I FB
I FB
V CC
PV CC1 PV CC2
NC
FB
G1
V COMP
COMP
G1
G1 RISE/FALL
NC
NC
NC
SS
FREQSET
COMP
LTC3830
6800pF
LTC3830
6800pF
I MAX
G2
V FB
FB
G2
G2 RISE/FALL
GND
PGND
SENSE –
SENSE +
6800pF
I MAX
GND
PGND
6800pF
3830 F03
3830 F02
Figure 2
APPLICATIO S I FOR ATIO
OVERVIEW
The LTC3830 is a voltage mode feedback, synchronous
switching regulator controller (see Block Diagram) de-
signed for use in high power, low voltage step-down
(buck) converters. It includes an onboard PWM generator,
a precision reference trimmed to ± 0.8%, two high power
MOSFET gate drivers and all necessary feedback and
control circuitry to form a complete switching regulator
circuit. The PWM loop nominally runs at 200kHz.
The 16-lead versions of the LTC3830 include a current
limit sensing circuit that uses the topside external N-channel
power MOSFET as a current sensing element, eliminating
the need for an external sense resistor.
Also included in the 16-lead version and the LTC3830-1
is an internal soft-start feature that requires only a single
external capacitor to operate. In addition, 16-lead parts
feature an adjustable oscillator that can free run or
synchronize to external signal with frequencies from
100kHz to 500kHz, allowing added flexibility in external
component selection. The 8-lead version does not in-
clude current limit, internal soft-start and frequency
adjustability. The LTC3830-1 does not include current
limit, frequency adjustability, external synchronization
and the shutdown function.
Figure 3
THEORY OF OPERATION
Primary Feedback Loop
The LTC3830/LTC3830-1 sense the output voltage of the
circuit at the output capacitor and feeds this voltage back
to the internal transconductance error amplifier, ERR,
through a resistor divider network. The error amplifier
compares the resistor-divided output voltage to the inter-
nal 1.265V reference and outputs an error signal to the
PWM comparator. This error signal is compared with a
fixed frequency ramp waveform, from the internal oscil-
lator, to generate a pulse width modulated signal. This
PWM signal drives the external MOSFETs through the G1
and G2 pins. The resulting chopped waveform is filtered by
L O and C OUT which closes the loop. Loop compensation is
achieved with an external compensation network at the
COMP pin, the output node of the error amplifier.
MIN, MAX Feedback Loops
Two additional comparators in the feedback loop provide
high speed output voltage correction in situations where
the error amplifier may not respond quickly enough. MIN
comparesthefeedbacksignaltoavoltage40mVbelowthe
internal reference. If the signal is below the comparator
threshold, the MIN comparator overrides the error ampli-
fier and forces the loop to maximum duty cycle, >91%.
3830fa
8
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相关代理商/技术参数 |
参数描述 |
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| LTC3830EGN | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,500 系列:PowerWise® PWM 型:控制器 输出数:1 频率 - 最大:1MHz 占空比:95% 电源电压:2.8 V ~ 5.5 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:-40°C ~ 125°C 封装/外壳:6-WDFN 裸露焊盘 包装:带卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名称:LM1771SSDX |
| LTC3830EGN#PBF | 功能描述:IC REG CTRLR BUCK PWM VM 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:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 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:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
| LTC3830EGN#TR | 功能描述:IC REG CTRLR BUCK PWM VM 16-SSOP RoHS:否 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) |
| LTC3830EGN#TRPBF | 功能描述:IC REG CTRLR BUCK PWM VM 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) |
| LTC3830ES | 功能描述:IC REG CTRLR BUCK PWM VM 16-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,000 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:1MHz 占空比:50% 电源电压:9 V ~ 10 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:无 工作温度:-40°C ~ 85°C 封装/外壳:8-TSSOP（0.173"，4.40mm 宽） 包装:带卷 (TR) |
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