参数资料
型号: AS1335-BTDT-100
厂商: ams
文件页数: 10/19页
文件大小: 0K
描述: IC REG BUCK SYNC 1V 1.5A 10WFDFN
标准包装: 1,000
类型: 降压(降压)
输出类型: 固定
输出数: 1
输出电压: 1V
输入电压: 2.6 V ~ 5.25 V
PWM 型: 电压模式
频率 - 开关: 1.5MHz
电流 - 输出: 1.5A
同步整流器:
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 10-WFDFN 裸露焊盘
包装: 带卷 (TR)
供应商设备封装: 10-TDFN(3x3)
AS1335
Datasheet - D e t a i l e d D e s c r i p t i o n
8 Detailed Description
The AS1335 is a high-efficiency buck converter that uses a constant-frequency current-mode architecture. The device
contains two internal MOSFET switches and is available with a user-adjustable output voltage.
Figure 18. AS1335 - Block Diagram
OSC
Ramp
Compensator
OSCN
ICOMP
+
VIN
Frequency
Shift
FB
0.6V
+
AS1335
Error
Amp
Main
0.6V +
Δ V OVL
OVDET
+
Digital
Logic
Anti-
Shoot
Through
SW
EN
0.6V
Reference
0.6V -
Δ V OVL
+
+
IRCMP
Shutdown
Power-OK
Compare
Logic
GND
RSI
POK
Main Control Loop
During normal operation, the internal top power MOSFET is turned on each cycle when the oscillator sets the RS latch.
This switch is turned off when the current comparator (ICOMP) resets the RS latch. The peak inductor current (I PK ) at
which ICOMP resets the RS latch, is controlled by the error amplifier. When I LOAD increases, V FB decreases slightly
relative to the internal 0.6V reference, causing the error amplifier ’s output voltage to increase until the average inductor
current matches the new load current.
When the top MOSFET is off, the bottom MOSFET is turned on until the inductor current starts to reverse as indicated
by the current reversal comparator (IRCMP), or the next clock cycle begins. The over-voltage detection comparator
(OVDET) guards against transient overshoots >7.8% by turning the main switch off and keeping it off until the transient
is removed.
Revision 1.03
9 - 18
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