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| 型号： | LT1578IS8#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 7/28页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 1.5A 8SOIC |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1.21V |
| 输入电压： | 4 V ~ 15 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 1.5A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-SOIC |
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LT1578/LT1578-2.5
BLOCK DIAGRA M
The LT1578 is a constant frequency, current mode buck
converter. This means that there is an internal clock and
two feedback loops that control the duty cycle of the power
switch. In addition to the normal error amplifier, there is a
current sense amplifier that monitors switch current on a
cycle-by-cycle basis. A switch cycle starts with an oscilla-
tor pulse which sets the R S flip-flop to turn the switch on.
When switch current reaches a level set by the inverting
input of the comparator, the flip-flop is reset and the
switch turns off. Output voltage control is obtained by
using the output of the error amplifier to set the switch
current trip point. This technique means that the error
amplifier commands current to be delivered to the output
rather than voltage. A voltage fed system will have low
phase shift up to the resonant frequency of the inductor
0.025 ?
INPUT
and output capacitor, then an abrupt 180 ° shift will occur.
The current fed system will have 90 ° phase shift at a much
lower frequency, but will not have the additional 90 ° shift
until well beyond the LC resonant frequency. This makes
it much easier to frequency compensate the feedback loop
and also gives much quicker transient response.
High switch efficiency is attained by using the BOOST pin
to provide a voltage to the switch driver which is higher
than the input voltage, allowing the switch to saturate. This
boosted voltage is generated with an external capacitor
and diode. Two comparators are connected to the shut-
down pin. One has a 2.42V threshold for undervoltage
lockout and the second has a 0.4V threshold for complete
shutdown.
+
–
2.9V BIAS
REGULATOR
INTERNAL
V CC
CURRENT SENSE
AMPLIFIER DC
VOLTAGE GAIN = 35
SLOPE COMP
Σ
0.8V
BOOST
SYNC
SHUTDOWN
200kHz
OSCILLATOR
+
CURRENT
COMPARATOR
S
R
R S
FLIP-FLOP
DRIVER
CIRCUITRY
Q1
POWER
SWITCH
COMPARATOR
0.4V
–
V SW
SHDN
3.5 μ A
FOLDBACK
CURRENT
Q2
FREQUENCY
SHIFT CIRCUIT
+
–
LOCKOUT
LIMIT
CLAMP
FB
2.42V
COMPARATOR
V C
ERROR
AMPLIFIER
g m = 1000 μ Mho
1.21V
GND
1578 BD
Figure 1. Block Diagram
7
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