- 您现在的位置：买卖IC网 > PDF目录15252 > LTC1922IG-1 (Linear Technology)IC REG CTRLR ISO PWM 20-SSOP PDF资料下载
参数资料
| 型号： | LTC1922IG-1 |
| 厂商： | Linear Technology |
| 文件页数： | 8/24页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR ISO PWM 20-SSOP |
| 标准包装： | 66 |
| 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-SSOP（0.209"，5.30mm 宽） |
| 包装： | 管件 |
LTC1922-1
OPERATIO
Phase Shift Full-Bridge PWM
Conventional full-bridge switching power supply topolo-
gies are often employed for high power, isolated DC/DC
and off-line converters. Although they require two addi-
tional switching elements, substantially greater power and
higher efficiency can be attained for a given transformer
size compared to the more common single-ended forward
and flyback converters. These improvements are realized
since the full-bridge converter delivers power during both
parts of the switching cycle, reducing transformer core
loss and lowering voltage and current stresses. The full-
bridge converter also provides inherent automatic trans-
former flux reset and balancing due to its bidirectional
drive configuration. As a result, the maximum duty cycle
range is extended, further improving efficiency. Soft switch-
ing variations on the full-bridge topology have been pro-
posed to improve and extend its performance and
application. These zero voltage switching (ZVS) tech-
niques exploit the generally undesirable parasitic ele-
ments present within the power stage. The parasitic
elements are utilized to drive near lossless switching
transitions for all of the external power MOSFETs.
LTC1922-1 phase shift PWM controller provides enhanced
performance and simplifies the design task required for a
ZVS phase shifted full-bridge converter. The primary
attributes of the LTC1922-1 as compared to currently
available solutions include:
1) Truly adaptive and accurate (DirectSense technology)
ZVS switching delays.
Benefit: higher efficiency, higher duty cycle capability,
eliminates external trim.
2) Internally generated drive signals for current doubler
synchronous rectifiers.
Benefit: eliminates external glue logic, drivers, optimal
timing for highest efficiency.
3) Programmable (single resistor) leading edge blanking.
Benefit: prevents spurious operation, reduces external
filtering required on CS.
4) Programmable (single resistor) slope compensation.
Benefit: eliminates external glue circuitry.
8
5) Optimized current mode control architecture.
Benefit: eliminates glue circuitry, less overshoot at start-
up, faster recovery from system faults.
6) Proven reference circuits and design tools.
Benefit: substantially reduced learning curve, more time
for optimization.
As a result, the LTC1922-1 makes the ZVS topology
feasible for a wider variety of applications, including those
at lower power levels.
The LTC1922-1 controls 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 winding be-
tween the input voltage and ground every oscillator cycle.
The pair of switches that conduct are alternated by an
internal flip-flop in the LTC1922-1. 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 actual percentage is
adaptively modulated by the LTC1922-1. The on-time
overlap of the diagonal switch pairs is controlled by the
LTC1922-1 phase modulation circuitry. (Refer to Block
and Timing Diagrams) This overlap sets the approximate
duty cycle of the converter. The LTC1922-1 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 the 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 pro-
duce 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.
相关PDF资料 |
PDF描述 |
|---|---|
| CDRH74NP-181MC | POWER INDUCTOR 180UH 0.42A SMD |
| H2AXT-10112-N8-ND | JUMPER-H1502TR/A3048N/X 12" |
| LT3804EFE | IC REG CTRLR ISO PWM 28-TSSOP |
| LTC1698IS | IC REG CTRLR ISO PWM CM 16-SOIC |
| LTC1698IGN#TRPBF | IC REG CTRLR ISO PWM CM 16-SSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| 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 |
| LTC1922IN-1 | 功能描述:IC REG CTRLR ISO PWM CM/VM 20DIP 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 |
| LTC1922IN-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:4,500 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 |
发布紧急采购，3分钟左右您将得到回复。