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参数资料
| 型号： | LTC3789EGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/30页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST PWM CM 28-SSOP |
| 标准包装： | 49 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 710kHz |
| 占空比： | 98% |
| 电源电压： | 4 V ~ 38 V |
| 降压： | 是 |
| 升压： | 是 |
| 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： | 28-SSOP（0.154"，3.90mm 宽） |
| 包装： | 管件 |
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LTC3789
OPERATION
D MAX _ BUCK = ? 1 ?
? ? 100% = 91.67%
SW1
SW2
SWITCH C
SWITCH D
BOOST REGION
FOUR SWITCH PWM
BUCK/BOOST REGION
BUCK REGION
POWERSWITCHCONTROL
Figure 1 shows a simplified diagram of how the four
power switches are connected to the inductor, V IN , V OUT
and GND. Figure 2 shows the regions of operation for
the LTC3789 as a function of duty cycle, D. The power
switches are properly controlled so the transfer between
regions is continuous.
Buck Region (V IN >> V OUT )
Switch D is always on and switch C is always off in this
region. At the start of every cycle, synchronous switch
B is turned on first. Inductor current is sensed when
synchronous switch B is turned on. After the sensed
inductor valley current falls below a reference voltage,
which is proportional to V ITH , synchronous switch B is
turned off and switch A is turned on for the remainder of
the cycle. Switches A and B will alternate, behaving like
a typical synchronous buck regulator. The duty cycle of
switch A increases until the maximum duty cycle of the
converter reaches D MAX_BUCK , given by:
? 1 ?
? 12 ?
V IN V OUT
TG1 A D TG2
L
BG1 B C BG2
R SENSE
3789 F01
Figure 1. Simplified Diagram of the Output Switches
90%
D MAX
OOST
A ON, B OFF
PWM C, D SWITCHES
D MIN
BOOST
D MAX
BUCK
D ON, C OFF
PWM A, B SWITCHES
D MIN
BUCK 3789 F02
Figure 3 shows typical buck region waveforms. If V IN
approaches V OUT , the buck-boost region is reached.
CLOCK
SWITCH A
SWITCH B
LOW
HIGH
I L
3780 F03
Figure 3. Buck Region (V IN >> V OUT )
Buck-Boost Region (V IN ≈ V OUT )
When V IN is close to V OUT , the controller enters buck-
boost region. Figure 4 shows the typical waveforms in this
region. At the beginning of a clock cycle, if the controller
starts with B and D on, the controller first operates as a
buck region. When I CMP trips, switch B is turned off, and
switch A is turned on. At 120° clock phase, switch C is
turned on. The LTC3789 starts to operate as a boost until
I CMP trips. Then, switch D is turned on for the remainder
of the clock period. If the controller starts with switches
A and C on, the controller first operates as a boost, until
I CMP trips and switch D is turned on. At 120°, switch B is
turned on, making it operate as a buck. Then, I CMP trips,
turning switch B off and switch A on for the remainder of
the clock period.
Boost Region (V IN << V OUT )
Switch A is always on and synchronous switch B is always
off in the boost region. In every cycle, switch C is turned
on first. Inductor current is sensed when synchronous
switch C is turned on. After the sensed inductor peak
current exceeds what the reference voltage demands,
which is proportional to V ITH , switch C is turned off and
synchronous switch D is turned on for the remainder of
the cycle. Switches C and D will alternate, behaving like a
typical synchronous boost regulator.
Figure 2. Operating Region vs Duty Cycle
3789fa
13
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