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參數(shù)資料
| 型號： | LTC1696 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Synchronous Dual Mode Phase Modulated Full Bridge Controllers |
| 中文描述： | 同步相位調(diào)制的雙模式全橋控制器 |
| 文件頁數(shù)： | 20/28頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LTC1696 |
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LTC3722-1/LTC3722-2
20
372212i
4. Using two CS transformers summed together.
5. Choose a CS transformer optimized for high frequency
applications.
Phase Modulator (LTC3722-1)
The LTC3722-1 phase modulation control circuitry is
comprised of the phase modulation comparator and logic,
the error amplifier, and the soft-start amplifier (see Fig-
ure12). 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
Figure 12. Phase Modulation Circuitry (LTC3722-1)
650mV
12
μ
A
3722 F11
R
S
Q
R
S
Q
+
–
+
–
+
–
+
–
Q
Q
C
D
B
A
CLK
CLK
CLK
1.2V
V
REF
SOFT-START
AMPLIFIER
ERROR
AMPLIFIER
TOGGLE
F/F
PHASE
MODULATION
LOGIC
PHASE
MODULATION
COMPARATOR
FROM
CURRENT
LIMIT
COMPARATOR
BLANKING
FB
COMP
SS
R
LEB
CS
14.9k
50k
OPTIONAL
FILTERING
N:1
MB
SOURCE
MD
SOURCE
CURRENT
TRANSFORMER
R
SLOPE
RAMP
CS
R
S
1922 F10
Figure 11. Current Transformer Sense Circuitry
directly. The voltage COMP is internally attenuated by the
LTC3722-1. 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 650mV. This is the current loop feedback.
During every switching cycle, alternate diagonal switches
(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 be-
tween 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 CS, usually through a small resistor (R
SLOPE
).
When the voltage on CS exceeds either (COMP/5.2)
–650mV, or 270mV, the overlap conduction period will
terminate. During normal operation, the attenuated COMP
voltage will determine the CS trip point. During start-up, or
slewing conditions following a large load step, the 270mV
CS threshold will terminate the cycle, as COMP will be
driven high, such that the attenuated version exceeds the
270mV threshold. In extreme conditions, the 650mV
threshold on CS will be exceeded, invoking a soft-start/
restart cycle.
OPERATIOU
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| LTC1696ES6#PBF | 制造商:Linear Technology 功能描述:IC OVERVOLTAGE PROTECTION CTRL SOT23-6 制造商:Linear Technology 功能描述:MONITOR OV 27VIN +/-2% ADJ 6SOT23 制造商:Linear Technology 功能描述:MONITOR, OV, 27VIN, +/-2%, ADJ, 6SOT23 制造商:Linear Technology 功能描述:IC, OVERVOLTAGE PROTECTION CTRL, SOT23-6; Input Voltage:17V; Output Voltage:6.3V; Supply Voltage Min:2.7V; Supply Voltage Max:27V; No. of Pins:6; No. of Outputs:1; Operating Temperature Min:-40C; Operating Temperature Max:85C ;RoHS Compliant: Yes |
| LTC1696ES6#TR | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1696ES6#TRM | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:否 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1696ES6#TRMPBF | 功能描述:IC OVERVOLT PROT CTRLR SOT23-6 RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
| LTC1696ES6#TRMPBF | 制造商:Linear Technology 功能描述:Controller IC 制造商:Linear Technology 功能描述:IC, OVERVOLTAGE PROTECTION CTRL, SOT23-6 |
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