參數(shù)資料
型號(hào)： CS5127GDW16
廠商： ZF Electronics Corporation
英文描述： Dual Output Nonsynchronous Buck Controller with Sync Function and Second Channel Enable
中文描述： 非同步雙輸出同步降壓控制器的功能及第二通道啟用
文件頁(yè)數(shù)： 4/24頁(yè)
文件大?。?/td> 293K
代理商： CS5127GDW16
C
4
Package Lead Description
PACKAGE LEAD #
LEAD SYMBOL
FUNCTION
16 Lead SO Wide
1
SYNC
A pulse train on this lead will synchronize the oscillator. Sync threshold level
is 2.4V. Synchronization frequency should be at least 10% higher than the reg-
ular operating frequency. The sync feature is level sensitive.
2
C
T
R
T
V
FB1
The oscillator integrating capacitor is connected to this lead.
3
The oscillator charge current setting resistor is connected to this lead.
4
The inverting input of the channel 1 error amplifier is brought out to this lead.
The lead is connected to a resistor divider which provides a measure of the
output voltage. The input is compared to a 1.275V reference, and channel 1
error amp output is used as the V
2
aPWM control voltage.
5
COMP1
Channel 1 error amp output and PWM comparator input.
6
V
FFB1
GATE1
This lead connects to the non-inverting input of the channel 1 PWM comparator.
7
This lead is the gate driver for the channel 1 FET. It is capable of providing
nearly 1A of peak current.
8
LGND
This lead provides a òquietó ground for low power circuitry in the IC. This
lead should be shorted to the PGND lead as close as possible to the IC for best
operating results.
9
PGND
This lead is the power ground. It provides the return path for the FET gate dis-
charge. It should be shorted to the LGND lead as close as possible to the IC for
best operating results.
10
GATE2
This lead is the gate driver for the channel 2 FET. See GATE1 lead description
for more details.
11
V
FFB2
COMP2
This lead connects to the non-inverting input of the channel 2 PWM comparator.
12
Channel 2 error amp output and PWM comparator input.
13
V
FB2
Inverting input for the channel 2 error amp. See V
FBI
for more details.
The regulator controlled by channel 2 may be turned on and off selectively by
the user. Pulling the ENABLE lead above 3.5V will turn channel 2 on. Setting
the ENABLE lead voltage below 1.5V guarantees that channel 2 is off.
14
ENABLE
15
V
REF
This lead is the output of a ± 3% reference. This reference drives most of the
on-chip circuitry, but will provide a minimum of 10 mA to external circuitry if
needed. The reference is inherently stable and does not require a compensa-
tion capacitor, but use of a decoupling capacitor will reduce noise in the IC.
16
V
IN
This lead is the power supply input to the IC. The maximum input voltage
that can be withstood without damage to the IC is 20V.
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