- 您现在的位置：买卖IC网 > PDF目录20668 > ISL6236EVAL2 (Intersil)EVAL BOARD 2 FOR ISL6236 PDF资料下载
参数资料
| 型号： | ISL6236EVAL2 |
| 厂商： | Intersil |
| 文件页数： | 25/35页 |
| 文件大小： | 0K |
| 描述： | EVAL BOARD 2 FOR ISL6236 |
| 标准包装： | 1 |
| 系列： | * |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页第20页第21页第22页第23页第24页当前第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页
ISL6236
VIN
t ON
MIN. t OFF
Q TRIG
ONE SHOT
OUT
+
R Q Q
TO UGATE DRIVER
S Q Q
ILIM
5μA
REFIN2 (SMPS2)
VREF
SLOPE COMP
COMP
BOOT
UV
DETECT
BOOT
VCC
PHASE
OUT
S
?
SKIP
S Q Q
R Q Q
TO LGATE DRIVER
ONE-SHOT
SECFB
2V
LATCH
FB
FB
DECODER
0.9V REF
1.1V REF
PGOOD
OV LATCH
UV LATCH
FAULT
FAULT
LATCH
LOGIC
SMSP1 ONLY
0.7V REF
20ms
BLANKING
FIGURE 70. PWM CONTROLLER (ONE SIDE ONLY)
Automatic Pulse-Skipping Switchover
(Idle Mode)
In Idle Mode (SKIP = GND), an inherent automatic switchover
to PFM takes place at light loads. This switchover is affected
Δ I
t
=
V IN -V OUT
L
I PEAK
by a comparator that truncates the low-side switch ON-time at
the inductor current's zero crossing. This mechanism causes
the threshold between pulse-skipping PFM and non-skipping
PWM operation to coincide with the boundary between
continuous and discontinuous inductor-current operation (also
known as the critical conduction point):
I LOAD = I PEAK/2
V IN
2 ? L
K ? V OUT V IN – V OUT
I LOAD ( SKIP ) = ------------------------ --------------------------------
(EQ. 3)
0
ON-TIME
TIME
PFM/PWM crossover occurs, I LOAD(SKIP) , is equal to half
the peak-to-peak ripple current, which is a function of the
inductor value (Figure 71). For example, in the ISL6236
typical application circuit with V OUT1 = 5V, V IN = 12V,
L = 7.6μH, and K = 5μs, switchover to pulse-skipping
operation occurs at I LOAD = 0.96A or about on-fifth full load.
The crossover point occurs at an even lower value if a
swinging (soft-saturation) inductor is used.
25
FIGURE 71. ULTRASONIC CURRENT WAVEFORMS
The switching waveforms may appear noisy and
asynchronous when light loading causes pulse-skipping
operation, but this is a normal operating condition that
results in high light-load efficiency. Trade-offs in PFM noise
vs light-load efficiency are made by varying the inductor
value. Generally, low inductor values produce a broader
efficiency vs load curve, while higher values result in higher
FN6373.6
April 29, 2010
相关PDF资料 |
PDF描述 |
|---|---|
| VE-BN2-EU-F1 | CONVERTER MOD DC/DC 15V 200W |
| ISL6605CBZA-T | IC MOSFET DRVR SYNC BUCK 8-SOIC |
| ACB70DHLD | CONN EDGECARD 140PS .050 DIP SLD |
| TC1303A-PP3EUN | IC REG DL BCK/LINEAR SYNC 10MSOP |
| M7WXK-0910J | D-SUB CABLE - MFU09K/MC10G/X |
相关代理商/技术参数 |
参数描述 |
|---|---|
| ISL6236IRZA | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
| ISL6236IRZAR5281 | 功能描述:IC MAIN PWR CTRLR QUAD 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
| ISL6236IRZA-T | 制造商:INTERSIL 制造商全称:Intersil Corporation 功能描述:High-Efficiency, Quad-Output, Main Power Supply Controllers for Notebook Computers |
| ISL6236IRZA-TKR5281 | 功能描述:IC QUAD OUT POWER CONTROL 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:2,000 系列:- 应用:控制器，DSP 输入电压:4.5 V ~ 25 V 输出数:2 输出电压:最低可调至 1.2V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:30-TFSOP（0.173"，4.40mm 宽） 供应商设备封装:30-TSSOP 包装:带卷 (TR) |
| ISL6236IRZA-TR5281 | 功能描述:IC MAIN PWR CTRLR QUAD 32-QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - 专用型 系列:- 标准包装:43 系列:- 应用:控制器，Intel VR11 输入电压:5 V ~ 12 V 输出数:1 输出电压:0.5 V ~ 1.6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:48-VFQFN 裸露焊盘 供应商设备封装:48-QFN（7x7） 包装:管件 |
发布紧急采购，3分钟左右您将得到回复。