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参数资料
| 型号： | LTC1922EN-1 |
| 厂商： | Linear Technology |
| 文件页数： | 17/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM CM/VM 20DIP |
| 标准包装： | 18 |
| PWM 型： | 电流/电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 99% |
| 电源电压： | 3.8 V ~ 10.3 V |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 20-DIP（0.300"，7.62mm） |
| 包装： | 管件 |
LTC1922-1
OPERATIO
Phase Modulator
The LTC1922-1 phase modulation control circuitry is
comprised of the phase modulation comparator and logic,
the error amplifier, and the soft-start amplifier (see
Figure 11). Together, these elements develop the required
phase overlap (duty cycle) required to keep the output
voltage in regulation. In isolated applications, the sensed
output voltage error signal is fed back to COMP across the
input to output isolation boundary by an optical coupler
and shunt reference/error amplifier (LT ? 1431) combina-
tion. The FB pin is connected to GND, forcing COMP high.
The collector of the optoisolator is connected to COMP
directly. The voltage COMP is internally attenuated by the
LTC1922-1. The attenuated COMP voltage provides one
input to the phase modulation comparator. This is the
current command. The other input to the phase modula-
tion comparator is the RAMP voltage, level shifted by
approximately 400mV. This is the current loop feedback.
(MA-MD or MB-MC) conduct and cause current in an
output inductor to increase. This current is seen on the
primary of the power transformer divided by the turns
ratio. Since the current sense resistor is connected
between GND and the two bottom bridge transistors, a
voltage proportional to the output inductor current will be
seen across R SENSE . The high side of R SENSE is also
connected to RAMP and CS, usually through a small
resistor (R SLOPE ). When the voltage on RAMP/CS exceeds
either COMP/5.2 – 400mV, or 400mv, the overlap conduc-
tion period will terminate. During normal operation, the
attenuated COMP voltage will determine the RAMP/CS trip
point. During start-up, or slewing conditions following a
large load step, the 400mV CS threshold will terminate the
cycle, as COMP will be driven high, such that the attenu-
ated version exceeds the 400mV threshold. In extreme
conditions, the 600mV threshold on CS will be exceeded,
invoking a soft-start/restart cycle.
During every switching cycle, alternate diagonal switches
TOGGLE
F/F
ERROR
Q
A
FB
+
AMPLIFIER
PHASE
CLK
Q
B
COMP
1.2V
V REF
–
50k
MODULATION
COMPARATOR
–
+
PHASE
MODULATION
LOGIC
S Q
C
D
SS
12 μ A
+
SOFT-START
AMPLIFIER
+
–
400mV
CLK
FROM
CURRENT
R
R LEB
RAMP
–
BLANKING
14.9k
Q S
LIMIT
COMPARATOR
R
CLK
1922 F11
Figure 11. Phase Modulation Circuitry
17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC1922EN-1#PBF | 功能描述:IC REG CTRLR ISO PWM CM/VM 20DIP 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:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 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:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| LTC1922IG-1 | 功能描述:IC REG CTRLR ISO PWM 20-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 |
| LTC1922IG-1#PBF | 功能描述:IC REG CTRLR ISO PWM 20-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: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 |
| LTC1922IG-1#TR | 功能描述:IC REG CTRLR ISO PWM 20-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 |
| LTC1922IG-1#TRPBF | 功能描述:IC REG CTRLR ISO PWM 20-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: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 |
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