參數(shù)資料
型號(hào)： LTC3722-1
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(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 319K
代理商： LTC3722-1
LTC3722-1/LTC3722-2
11
372212i
3) Internally generated drive signals with programmable
turn-off for current doubler synchronous rectifiers.
Benefit: eliminates external glue logic, drivers, optimal
timing for highest efficiency.
4) Programmable (single resistor) leading edge blanking.
Benefit: prevents spurious operation, reduces external
filtering required on CS.
5) Programmable (single resistor) slope compensation.
Benefit: eliminates external glue circuitry.
6) Optimized current mode control architecture.
Benefit: eliminates glue circuitry, less overshoot at start-
up, faster recovery from system faults.
7) Programmable system undervoltage lockout and hys-
teresis.
Benefit: provides an accurate turn-on voltage for power
supply and reduces external circuitry.
As a result, the LTC3722-1/LTC3722-2 makes the ZVS
topology feasible for a wider variety of applications, in-
cluding those at lower power levels.
The LTC3722-1/LTC3722-2 control four external power
switches in a full-bridge arrangement. The load on the
bridge is the primary winding of a power transformer. The
diagonal switches in the bridge connect the primary wind-
ing between the input voltage and ground every oscillator
cycle. The pair of switches that conduct are alternated by
an internal flip-flop in the LTC3722-1/LTC3722-2. Thus,
the voltage applied to the primary is reversed in polarity on
every switching cycle and each output drive signal is 1/2
the frequency of the oscillator. The on-time of each driver
signal is slightly less that 50%. The on-time overlap of the
diagonal switch pairs is controlled by the LTC3722-1/
LTC3722-2 phase modulation circuitry. (Refer to Block
and Timing Diagrams) This overlap sets the approximate
duty cycle of the converter. The LTC3722-1/LTC3722-2
driver output signals (OUTA to OUTF) are optimized for
interface with an external gate driver IC or buffer. External
power MOSFETs A and C require high side driver circuitry,
while B and D are ground referenced and E and F are
ground referenced but on the secondary side of the
isolation barrier. Methods for providing drive to these
elements are detailed in this data sheet. The secondary
voltage of the transformer is the primary voltage divided
by the transformer turns ratio. Similar to a buck converter,
the secondary square wave is applied to an output filter
inductor and capacitor to produce a well regulated DC
output voltage.
Switching Transitions
The phase shifted full-bridge can be described by four
primary operating states. The key to understanding how
ZVS occurs is revealed by examining the states in detail.
Each full cycle of the transformer has two distinct periods
in which power is delivered to the output, and two “free-
wheeling” periods. The two sides of the external bridge
have fundamentally different operating characteristics that
become important when designing for ZVS over a wide
load current range. The left bridge leg is referred to as the
“passive” leg, while the right leg is referred to as the
“active” leg. The following descriptions provide insight as
to why these differences exist.
State 1 (Power Pulse 1)
Referring to Figure 1, State 1 begins with MA, MD and MF
“ON” and MB, MC and ME “OFF.” During the simultaneous
conduction of MA and MD, the full input voltage is applied
across the transformer primary winding and following the
dot convention, V
IN
/N is applied to the left side of LO1
allowing current to increase in LO1. The primary current
during this period is approximately equal to the output
inductor current (LO1) divided by the transformer turns
ratio plus the transformer magnetizing current (V
IN
t
ON
/
L
MAG
). MD turns off and ME turns on at the end of State 1.
State 2 (Active Transition and Freewheel Interval)
MD turns off when the phase modulator comparator
transitions. At this instant, the voltage on the MD/MC
junction begins to rise towards the applied input voltage
(V
IN
). The transformer’s magnetizing current and the
reflected output inductor current propels this action. The
slew rate is limited by MOSFET MC and MD’s output
capacitance (C
OSS
), snubbing capacitance and the trans-
former interwinding capacitance. The voltage transition
OPERATIOU
相關(guān)PDF資料
PDF描述
LTC3722EGN-1 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
LTC3722EGN-2 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
LTC1922-1 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
LTC1696 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
LTC3722-2 Synchronous Dual Mode Phase Modulated Full Bridge Controllers
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3722EGN-1 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:否 類(lèi)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(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3722EGN-1#PBF 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:是 類(lèi)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)
LTC3722EGN-1#TR 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:否 類(lèi)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(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3722EGN-1#TRPBF 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:是 類(lèi)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(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
LTC3722EGN-2 功能描述:IC REG CTRLR DIV ISO PWM 24SSOP RoHS:否 類(lèi)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(pán) 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*