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参数资料
| 型号： | LTC3723EGN-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20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
product offerings as well. A different approach is to add a
winding to the output inductor and peak detect and filter
the square wave signal (see Figure 4b). The polarity of this
winding is designed so that the positive voltage square
wave is produced while the output inductor is freewheel-
ing. An advantage of this technique over the previous is
Figure 5, the leading edge of an external pulse is used to
terminate the natural clock cycle. If the external frequency
is higher than the oscillator frequency, the internal oscil-
lator will synchronize with the external input frequency.
that it does not require a separate filter inductor and since
the voltage is derived from the well-regulated output
f OSC < f EXT < 1.25 ? f OSC
LTC3723
C T
voltage, it is also well controlled. One disadvantage is that
this winding will require the same safety isolation that is
required for the main transformer. Another disadvantage
is that a much larger V CC filter capacitor is needed, since
it does not generate a voltage as the output is first starting
EXTERNAL
FREQUENCY
SOURCE
f SW = f OSC /2
f OSC ?
C T
68pF
390 ?
210 μ A
2.56V ? C T
BAT54
372312 F05
up, or during short-circuit conditions.
Figure 5. Synchronization from External Source
V IN
R START
ISO BARRIER
L OUT
+
V OUT
Single-Ended Operation
In addition to push-pull and full-bridge topologies, single-
ended topologies such as the forward and flyback con-
V CC
1 μ F
C HOLD
372312 F04b
verter can benefit from the many advanced features of the
LTC3723. In Figure 6, the LTC3723 is used with the
LTC4440, 100V high side driver to implement a two-
transistor forward converter. DRVB is used which limits
Figure 4b. Output Inductor Bias Supply
Programming the LTC3723-1/LTC3723-2 Oscillator
The high accuracy LTC3723-1/LTC3723-2 oscillator cir-
the converter’s maximum duty cycle to 50% (less pro-
grammable driver dead time).
V IN
TG
cuit provides flexibility to program the switching fre-
quency and slope compensation required for current
IN
LTC4440
GND
TS
mode control (LTC3723-1). The oscillator circuit pro-
duces a 2.35V peak-to-peak amplitude ramp waveform on
C T . Typical maximum duty cycles of 49% are possible. The
oscillator is capable of operation up to 1MHz by the
–V IN
f SW ?
following equation:
C T = 1/(14.8k ? F OSC )
Note that this is the frequency seen on C T . The output
drivers switch at 1/2 of this frequency. Also note that
DRVB
SDRB
LTC3723
C T GND
TO SYNCHRONOUS
SECONDARY MOSFET
210 μ A
2 ? 2.56V ? C T
higher switching frequency and added driver dead-time
via DPRG will reduce the maximum duty cycle.
The LTC3723-1/LTC3723-2 can be synchronized to an
C T
372312 F06
Figure 6. Two-Transistor Forward Converter (Duty Cycle < 50%)
external frequency source such as another PWM chip. In
372312f
12
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