- 您现在的位置：买卖IC网 > PDF目录15332 > MIC2186YM TR (Micrel Inc)IC REG CTRLR BST FLYBK CM 16SOIC PDF资料下载
参数资料
| 型号： | MIC2186YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/15页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK CM 16SOIC |
| 标准包装： | 2,500 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 440kHz |
| 占空比： | 85% |
| 电源电压： | 2.9 V ~ 14 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 16-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC2186YMTR MIC2186YMTR-ND |
MIC2186
Micrel, Inc.
The reverse voltage requirement of the diode is:
For the MIC2186, Schottky diodes are recommended when
they can be used. They have a lower forward voltage drop
than ultra-fast rectifier diodes, which lowers power dissipa-
tion and improves efficiency. They also do not have a recov-
ery time mechanism, which results in less ringing and noise
when the diode turns off. If the output voltage of the circuit
F / 2 p i n
L e v e l
0
1
0
1
H i D C
L e v e l
1
1
0
0
S w i t c h i n g
F r e q u e n c y
4 0 0 k H z
2 0 0 k H z
2 0 0 k H z
1 0 0 k H z
M a x i m u m
D u t y C y c l e
8 5 %
8 5 %
5 0 %
5 0 %
T y p i c a l
M i n i m u m
D u t y C y c l e
7 %
6 %
4 %
3 %
T O F F i n
S k i p M o d e
1 μ s
2 μ s
1 μ s
2 μ s
prevents the use of a Schottky diode, then only ultra-fast
recovery diodes should be used. Slower diodes will dissipate
more power in both the MOSFET and the diode. The will also
cause excessive ringing and noise when the diode turns off.
Reference, Enable and UVLO Circuits
The output drivers are enabled when the following conditions
are satisfied:
? The Vdd voltage (pin 10) is greater than its
undervoltage threshold.
? The voltage on the enable pin is greater than the
enable UVLO threshold.
The internal bias circuitry generates a 1.245V bandgap
reference for the voltage error amplifier and a 3V Vdd voltage
for the internal supply bus. The reference voltage in the
MIC2186 is buffered and brought out to pin 8. The Vref pin
must be bypassed to GND (pin 4) with a 0.1uf capacitor. The
Vdd pin must be decoupled to ground with a 1uf ceramic
capacitor.
The enable pin (pin 7) has two threshold levels, allowing the
MIC2186 to shut down in a micro-current mode, or turn off
output switching in standby mode. Below 0.9V, the device is
forced into a micro-power shutdown. If the enable pin is
between 0.9V and 1.5V the output gate drive is disabled but
the internal circuitry is powered on and the soft start pin
voltage is forced low. There is typically 135mV of hysteresis
below the 1.5V threshold to insure the part does not oscillate
on and off due to ripple voltage on the input. Raising the
enable voltage above the UVLO threshold of 1.5V enables
the output drivers and allows the soft start capacitor to
charge. The enable pin may be pulled up to VinA.
Oscillator & Sync
The internal oscillator is self-contained and requires no
external components. The HiDC and f/2 pins allow the user
to select from three different switching frequencies and two
maximum duty cycles. The chart in Table 1 shows the four
combinations that can be programmed along with the typical
minimum and maximum duty cycles.
Table 1
Minimum duty cycle becomes important in a boost converter
as the input voltage approaches the output voltage. At lower
duty cycles, the input voltage can be closer to the output
voltage without the output rising out of regulation.
A frequency foldback mode is enabled if the voltage on the
feedback pin (pin 6) is less than 0.3V. In frequency foldback
the oscillator frequency is reduced by approximately a factor
of 4. For the 400kHz setting, the oscillator runs at 100khz in
frequency foldback. For a 200kHz setting the oscillator runs
at approximately 50kHz and for a 100kHz setting, the oscil-
lator runs at approximately 25kHz.
The SYNC input (pin 11) allows the MIC2186 to synchronize
with an external CMOS or TTL clock signal. Depending on the
setting of the HiDC pin,the output frequency is either equal to
or 1/2 of the sync input frequency. If the HiDC level is low, the
output switching frequency is half the sync frequency. If the
HiDC level is high, the output switching frequency is equal to
the sync frequency.
The rising edge of the sync signal generates a reset signal in
the oscillator, which turns off the high-side gate drive output.
The low-side drive is turned on, restarting the switching cycle.
The sync signal is inhibited when the controller operates in
skip mode or frequency foldback. The sync signal frequency
must be greater than the maximum specified free running
frequency of the MIC2186. If the synchronizing frequency is
lower, double pulsing of the gate drive outputs will occur.
When not used, the sync pin must be connected to ground.
Table 2 shows the minimum recommended sync frequencies
for the different combinations of f/2 and HiDC inputs.
Figure 8a shows the timing between the external sync signal
(trace 2) and the low-side drive (trace 1) for a high level on the
HiDC pin. Figure 8b shows the timing between the external
sync signal (trace 2) and the low-side drive (trace 1) for a low
level on the HiDC pin. The sync frequency is twice the output
switching frequency.
F / 2 p i n
L e v e l
H i D C
L e v e l
S e l f O s c i l l a t i n g
F r e q u e n c y
M i n i m u m
R e c o m m e n d e d
S y n c F r e q u e n c y
S y n c I n p u t F r e q u e n c y
f S = o u t p u t s w i t c h i n g f r e q u e n c y
f S Y N C = s y n c i n p u t f r e q u e n c y
0
1
0
1
1
1
0
0
4 0 0 k H z
2 0 0 k H z
2 0 0 k H z
1 0 0 k H z
4 8 0 k H z
2 5 0 k H z
4 8 0 k H z
2 5 0 k H z
f S = f S Y N C
f S = f S Y N C
f S = 1 / 2 f S Y N C
f S = 1 / 2 f S Y N C
Table 2
M9999-042205
12
April 2005
相关PDF资料 |
PDF描述 |
|---|---|
| ASM10DRYH-S13 | CONN EDGECARD 20POS .156 EXTEND |
| UPM1E152MHD | CAP ALUM 1500UF 25V 20% RADIAL |
| MIC2185YM TR | IC REG CTRLR BST PWM CM 16-SOIC |
| IDCS2512ER152M | INDUCTOR POWER 1500UH 0.12A SMD |
| MIC2184YM TR | IC REG CTRLR BUCK PWM CM 16-SOIC |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2186YQS | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2186YQS TR | 功能描述:DC/DC 开关控制器 SO-16 Low Vin Synchronous Buck PWM Control IC (Lead Free) RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| MIC2193 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:400KHZ SO 8 SYNCHRONOUS BUCK CONTROL IC |
| MIC2193BM | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
| MIC2193BM TR | 功能描述:IC REG CTRLR BUCK PWM CM 8-SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:4,000 系列:- PWM 型:电压模式 输出数:1 频率 - 最大:1.5MHz 占空比:66.7% 电源电压:4.75 V ~ 5.25 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 85°C 封装/外壳:40-VFQFN 裸露焊盘 包装:带卷 (TR) |
发布紧急采购，3分钟左右您将得到回复。