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參數(shù)資料
| 型號： | HV9221 |
| 廠商： | ELAN Microelctronics Corp . |
| 英文描述： | High Frequency Multi-Function Current Mode PWM Controller(輸入范圍15V-450V，高頻多功能電流型脈寬調(diào)制控制器) |
| 中文描述： | 高頻多功能電流模式PWM控制器（15V的輸入范圍- 450V，高頻多功能電流型脈寬調(diào)制控制器） |
| 文件頁數(shù)： | 5/5頁 |
| 文件大?。?/td> | 38K |
| 代理商： | HV9221 |
14-42
HV9221
Pin Descriptions
GND
-
Ground connection for all low level analog and digital
circuits.
PWRGND
- This pin provides ground return for the high transient
currents of the output driver circuits.
+V
- This is the start-up pre-regulator input which can accept
input voltages in the range of 15 to 450 volts DC.
V
- This is the supply pin to the PWM circuit. During start-up
this pin is powered by the start-up linear pre-regulator which
regulates to a nominal voltage of 8 volts over the full input voltage
range of the +V
IN
pin.
OUT-A, OUT-B
- These high current push-pull outputs of the
PWM are designed to drive the gates of power MOSFETs.
REF
- This pin provides a 1% accuracy 2.5 volts buffered, low
output impedance reference.
ENABLE-A, ENABLE B
- These input pins provide means for
shutting down the PWM.
MODE
- This input is used to select the operating mode of this
PWM. The mode selections are as follows:
Pin Connection
Operating Mode
GND
OPEN
V
CC
49% Dual PWM
99% Dual PWM
49% Single Push-Pull PWM
SYNC
- This bidirectional Input/Output negative transition active
pin provides a means for synchronizing several PWM chips or
synchronizing against an application system master oscillator.
SCA, SCB
- These low impedance output buffered ramp genera-
tors provide positive going ramp outputs corresponding to the
mode of operation of this PWM circuit and is intended to enable
the user to provide optimal slope compensation to the feedback
circuits.
CSA, CSB
- These are the current sense inputs to the PWM
comparators.
COMPA, COMPB
- The low impedance output of the error
amplifiers.
FBA, FBB
- The high impedance inverting input of the error
amplifiers.
NIA, NIB
- The high impedance non-inverting input of the error
amplifiers.
RT
- The oscillator charging current is set by the value of the
resistor connected from RT to GND.
RD
- External resistor to GND to control the discharge rate of the
internal timing capacitor.
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