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参数资料
| 型号： | LTC3723EGN-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/20页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR FLYBK ISO VM 16SSOP |
| 标准包装： | 100 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 占空比： | 50% |
| 电源电压： | 10V（最小值） |
| 降压： | 无 |
| 升压： | 无 |
| 回扫： | 是 |
| 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： | 16-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
LTC3723-1/LTC3723-2
OPERATIO
The LTC3723-1 derives a compensating slope current
from the oscillator ramp waveform and sources this
current out of CS. This function is disabled in the
LTC3723-2. The desired level of slope compensation is
selected with an external resistor connected between CS
and the external current sense resistor, (Figure 11).
Current Sensing and Overcurrent Protection
Current sensing provides feedback for the current mode
control loop and protection from overload conditions. The
LTC3723-1/LTC3723-2 are compatible with either resis-
tive sensing or current transformer methods. Internally
connected to the LTC3723-1/LTC3723-2 CS pin are two
comparators that provide pulse-by-pulse and overcurrent
shutdown functions respectively, (Figure 12).
The pulse-by-pulse comparator has a 300mV nominal
threshold. If the 300mV 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 LTC3723-1/LTC3723-2 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 13 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
V(C T )
C T
LTC3723
I=
33k
CS
R SLOPE
SWITCH
CURRENT
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
33k
ADDED
SLOPE
R CS
overcurrent comparator provides a means of protecting
CURRENT SENSE
WAVEFORM
372312 F11
the power converter.
Leading Edge Blanking
Figure 11. Slope Compensation Circuitry
The LTC3723-1/LTC3723-2 provides programmable lead-
ing edge blanking to prevent nuisance tripping of the
PULSE BY PULSE
CURRENT LIMIT
PWM
LATCH
Q
PWM
LOGIC
UVLO
ENABLE
H = SHUTDOWN
OUTPUTS
current sense circuitry. Leading edge blanking relieves the
filtering requirements for the CS pin, greatly improving the
+
CS
300mV
PWM
–
OVERLOAD
S
S Q
R
Q
response to real overcurrent conditions. It also allows the
use of a ground referenced current sense resistor or
600mV
R CS
CURRENT LIMIT
+
–
UVLO
ENABLE
S Q
R
4.1V
0.4V
13 μ A
SS
C SS
transformer(s), further simplifying the design. With a
single 10k to 100k resistor from R LEB to GND, blanking
times of approximately 40ns to 320ns are programmed. If
not required, connecting R LEB to V REF can disable leading
Q
372312 F12
edge blanking. Keep in mind that the use of leading edge
blanking will slightly reduce the linear control range for the
pulse width modulator.
Figure 12. Current Sense/Fault Circuitry Detail
372312f
14
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