- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄377775 > LTC3722-2 (Linear Technology Corporation) Synchronous Dual Mode Phase Modulated Full Bridge Controllers PDF資料下載
參數(shù)資料
| 型號： | LTC3722-2 |
| 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)： | 18/28頁 |
| 文件大?。?/td> | 319K |
| 代理商： | LTC3722-2 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁
LTC3722-1/LTC3722-2
18
372212i
of slope compensation. The value of this resistor is depen-
dent on several factors including minimum V
IN
, V
OUT
,
switching frequency, current sense resistor value and
output inductor value. An illustrative example with the
design equation is provided below.
Example: V
IN
= 36V to 72V
V
OUT
= 3.3V
I
OUT
= 40A
L = 2.2
μ
H
Transformer turns ratio (N) = V
IN(MIN)
D
MAX
/
V
OUT
=3
R
CS
= 0.025
f
SW
= 300kHz, i.e., transformer f = f
SW
/2 = 150kHz
R
SLOPE
= V
O
R
CS
/(2 L f
T
82.5
μ
A N) = 3.3V 0.025/
(2 2.2
μ
A 100k 82.5
μ
A 3)
R
SLOPE
= 505
, choose the next higher standard value
to account for tolerances in I
SLOPE
, R
CS
, N and L.
Current Sensing and Overcurrent Protection
Current sensing provides feedback for the current mode
control loop and protection from overload conditions. The
LTC3722-1/LTC3722-2 are compatible with either resis-
tive sensing or current transformer methods. Internally
connected to the LTC3722-1/LTC3722-2 CS pin are two
comparators that provide pulse-by-pulse and overcurrent
shutdown functions respectively. (See Figure 10)
The pulse-by-pulse comparator has a 270mV nominal
threshold. If the 270mV threshold is exceeded, the PWM
cycle is terminated. The overcurrent comparator is set
approximately 2x higher than the pulse-by-pulse level. If
the current signal exceeds this level, the PWM cycle is
terminated, the soft-start capacitor is quickly discharged
and a soft-start cycle is initiated. If the overcurrent condi-
tion persists, the LTC3722-1/LTC3722-2 halts PWM op-
eration and waits for the soft-start capacitor to charge up
to approximately 4V before a retry is allowed. The soft-
start capacitor is charged by an internal 12
μ
A current
source. If the fault condition has not cleared when soft-
start reaches 4V, the soft-start pin is again discharged and
a new cycle is initiated. This is referred to as hiccup mode
operation. In normal operation and under most abnormal
conditions, the pulse-by-pulse comparator is fast enough
to prevent hiccup mode operation. In severe cases, how-
ever, with high input voltage, very low R
DS(ON)
MOSFETs
and a shorted output, or with saturating magnetics, the
overcurrent comparator provides a means of protecting
the power converter.
Figure 9. Slope Compensation Circuitry
BRIDGE
CURRENT
CURRENT SENSE
WAVEFORM
V(C
T
)
33k
I =
CS
C
T
33k
ADDED
SLOPE
R
SLOPE
R
CS
3722 F07
LTC3722
Figure 10. Current Sense/Fault Circuitry Detail
+
–
+
–
OVERLOAD
CURRENT LIMIT
270mV
650mV
φ
MOD
UVLO
ENABLE
UVLO
ENABLE
R
S
Q
R
S
Q
Q
Q
S
Q
PWM
LOGIC
H = SHUTDOWN
OUTPUTS
CS
R
CS
+
–
+
–
C
SS
SS
0.4V
4.1V
12
μ
A
3722 F08
PULSE BY PULSE
CURRENT LIMIT
PWM
LATCH
OPERATIOU
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LTC3727 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC3727EG-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC3727EG | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC3727-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
| LTC3727EUH-1 | RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS |
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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 升壓:是 回掃:是 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 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 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 切換控制器 系列:- 標準包裝: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 回掃:無 反相:無 倍增器:無 除法器:無 Cuk:無 隔離:無 工作溫度:-40°C ~ 125°C 封裝/外殼:6-WDFN 裸露焊盤 包裝:帶卷 (TR) 配用:LM1771EVAL-ND - BOARD EVALUATION LM1771 其它名稱:LM1771SSDX |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。