参数资料
型号: ISL6236AIRZ-T
厂商: Intersil
文件页数: 31/37页
文件大小: 0K
描述: IC MAIN PWR CTRLR QUAD 32-QFN
产品培训模块: Solutions for Industrial Control Applications
标准包装: 6,000
应用: 控制器,笔记本电脑电源系统
输入电压: 4.5 V ~ 25 V
输出数: 4
输出电压: 多重
工作温度: -40°C ~ 100°C
安装类型: 表面贴装
封装/外壳: 32-VFQFN 裸露焊盘
供应商设备封装: 32-QFN 裸露焊盘(5x5)
包装: 带卷 (TR)
ISL6236A
Power-Up Sequencing and On/Off Controls (EN )
EN1 and EN2 control SMPS power-up sequencing. EN1 or
EN2 rising above 2.4V enables the respective outputs. EN1
or EN2 falling below 1.6V disables the respective outputs.
Connecting EN1 or EN2 to REF will force its outputs off while
second SMPS remains on until the first SMPS turns off, the
device shuts down, a fault occurs or PVCC goes into
undervoltage lockout. Both supplies begin their power-down
sequence immediately when the first supply turns off. Driving
EN below 0.8V clears the overvoltage, undervoltage and
thermal fault latches.
the other output is below regulation. The sequenced SMPS
will start once the other SMPS reaches regulation. The
TABLE 3. OPERATING-MODE TRUTH TABLE
MODE
Power-Up
Run
Overvoltage
Protection
Undervoltage
Protection
Discharge
Standby
Shutdown
Thermal Shutdown
CONDITION
PVCC < UVLO threshold.
EN LDO = high, EN1 or EN2
enabled.
Either output > 111% (VOUT1) or
116% (VOUT2) of nominal level.
Either output < 70% of nominal after
20ms time-out expires and output is
enabled.
Either SMPS output is still high in
either standby mode or shutdown
mode
EN1, EN2 < start-up threshold, EN
LDO = High
EN1, EN2, EN LDO = low
TJ > +150°C
COMMENT
Transitions to discharge mode after a VIN POR and after REF becomes valid. LDO,
VREF3 and REF remain active.
Normal operation
LGATE is forced high. LDO, VREF3 and REF active. Exited by a VIN POR, or by
toggling EN1 or EN2.
The internal 25 Ω switch turns on. LDO, VREF3 and REF are active. Exited by a VIN
POR or by toggling EN1 or EN2.
Discharge switch (25 Ω ) connects OUT to GND. One output may still run while the
other is in discharge mode. Activates when PVCC is in UVLO, or transition to UVLO,
standby, or shutdown has begun. LDO, VREF3 and REF active.
LDO, VREF3 and REF active.
Discharge switch (25 Ω ) connects OUT to PGND. All circuitry off except VREF3.
All circuitry off. Exited by VIN POR or cycling EN. VREF3 remain active.
TABLE 4. SHUTDOWN AND STANDBY CONTROL LOGIS
VEN LDO
Low
“>2.5” → High
“>2.5” → High
“>2.5” → High
“>2.5” → High
“>2.5” → High
“>2.5” → High
VEN1 (V)
Low
Low
High
High
Low
High
REF
VEN2 (V)
Low
Low
High
Low
High
REF
High
LDO
Off
On
On
On
On
On
On
SMPS1
Off
Off
On
On
Off
On
On (after SMPS2 is up)
SMPS2
Off
Off
On
Off
On
On (after SMPS1 is up)
On
31
FN6453.3
March 18, 2008
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