参数资料
| 型号： | SP6136ER1-L/TR |
| 厂商： | Exar Corporation |
| 文件页数： | 6/18页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 16-QFN |
| 标准包装： | 3,000 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 680kHz |
| 占空比： | 92% |
| 电源电压： | 5 V ~ 24 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： | 16-VFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
THEORY OF OPERATION
IV IN, X = C OUT ? Δ V OUT ?
Δ TSoft-start
The SP6136 contains two unique control
features that are very powerful in distributed
applications. First, non-synchronous driver
control is enabled during start up to prohibit
the low side NFET from pulling down the out-
put until the high side NFET has attempted to
turn on. Second, a 00% duty cycle timeout
ensures that the low side NFET is periodically
enhanced during extended periods at 00%
duty cycle. This guarantees the synchronized
refreshing of the BST capacitor during very
large duty ratios.
The SP6 36 also contains a number of valu-
able protection features. A programmable
input UVLO allows a user to set the exact
value at which the conversion voltage is
at a safe point to begin down conversion,
and an internal V CC UVLO ensures that
the controller itself has enough voltage to
properly operate. Other protection features
include thermal shutdown and short-circuit
detection. In the event that either a thermal,
short-circuit, or UVLO fault is detected, the
SP6 36 is forced into an idle state where the
output drivers are held off for a finite period
before a re-start is attempted.
Soft Start
“Soft Start” is achieved when a power con-
verter ramps up the output voltage while
controlling the magnitude of the input sup-
ply source current. In a modern step down
converter, ramping up the non-inverting input
of the error amplifier controls soft start. As a
result, excess source current can be defined
as the current required to charge the output
capacitor
C OUT ? Δ V OUT
IV IN, X =
The SP6 36 provides the user with the op-
tion to program the soft start rate by tying
a capacitor from the SS pin to GND. The
selection of this capacitor is based on the
0μA pull up current present at the SS pin
and the 0.8V reference voltage. Therefore,
the excess current source can be redefined
as:
0μA
(C SS X 0.8V)
Hiccup
Upon the detection of a power, thermal, or
short-circuit fault, the SP6 36 is forced into
an idle state for a minimum of 200ms. The
SS and COMP pins are immediately pulled
low, and the gate drivers are held off for the
duration of the timeout period. Power and
thermal faults have to be removed before a
restart may be attempted, whereas, a short-
circuit fault is internally cleared shortly after
the fault latch is set. Therefore, a restart at-
tempt is guaranteed every 200ms (typical) as
long as the short-circuit condition persists.
A short-circuit detection comparator has
also been included in the SP6 36 to protect
against the accidental short or severe build
up of current at the output of the power con-
verter. This comparator constantly monitors
the inputs to the error amplifier, and if the
V FB pin ever falls more than 250mV (typical)
below the voltage reference, a short-circuit
fault is set. Because the SS pin overrides the
internal 0.8V reference during soft start, the
SP6 36 is capable of detecting short-circuit
faults throughout the duration of soft start as
well as in regular operation.
Error Amplifier & Voltage Loop
As stated before, the heart of the SP6 36
voltage error loop is a high performance,
wide bandwidth transconductance ampli-
fier. Because of the amplifier ’s current
limited (+ 00μA) transconductance, there
are many ways to compensate the voltage
loop or to control the COMP pin externally.
If a simple, single pole, single zero response
is required, then compensation can be as
simple as an RC circuit to ground. If a more
complex compensation is required, then the
amplifier has enough bandwidth (45° at 4
Oct 3 -06 Rev L
SP6 36 Synchronous Buck Controller
6
? 2006 Sipex Corporation
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相关代理商/技术参数 |
参数描述 |
|---|---|
| SP6137 | 制造商:SIPEX 制造商全称:Sipex Corporation 功能描述:Wide Input, 900KHz Synchronous PWM Controller |
| SP6137CU | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU/TR | 制造商:Exar Corporation 功能描述:SMPS Controller |
| SP6137CU-L | 功能描述:开关变换器、稳压器与控制器 Wide Input, 900KHz Synchronous RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| SP6137CU-L/TR | 功能描述:开关变换器、稳压器与控制器 Wide Input, 900KHz Synchronous RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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