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參數(shù)資料
| 型號(hào)： | 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(yè)數(shù)： | 18/28頁(yè) |
| 文件大小： | 319K |
| 代理商： | LTC1696 |
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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
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| 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(pán) 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
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