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参数资料
| 型号： | PCZ33937AEK/R2 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | AC MOTOR CONTROLLER, 0.8 A, PDSO54 |
| 封装： | 4.60 X 6.30 MM, 0.65 MM PITCH, ROHS COMPLIANT, SOIC-54 |
| 文件页数： | 24/47页 |
| 文件大小： | 749K |
| 代理商： | PCZ33937AEK/R2 |
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Analog Integrated Circuit Device Data
30
Freescale Semiconductor
33937
FUNCTIONAL INTERNAL BLOCK DESCRIPTION
INTRODUCTION
HOLD OFF CIRCUIT
The IC guarantees the output FETs are turned off in the
absence of VDD or VPWR by means of the Hold off circuit. A
small current source, generated from VSUP, typically 100A,
is mirrored and pulls all the output gate drive pins low when
VDD is less than about 3.0V, RST is active (low), or when VLS
is lower than the VLS_Disable threshold. A minimum of
approximately 3.0V is required on VSUP to energize the Hold
off circuit.
CHARGE PUMP
The Charge Pump circuit provides the basic switching
elements required to implement a charge pump, when
combined with external capacitors and diodes for enhanced
low voltage operation.
When the 33937 is connected per the typical application
using the charge pump (see Figure 22), the regulation path
for VLS includes the charge pump and a linear regulator. The
regulation set point for the linear regulator is nominally at
15.34V. As long as VLS output voltage (VLSOUT) is greater
than the VLS analog regulator threshold (VLSATH) minus
VTHREG, the charge pump is not active.
If VLSOUT < VLSATH – VTHREG the charge pump turns ON
until VLSOUT > VLSATH – VTHREG + VHYST
VHYST is approximately 200mV. VLSATH will not interfere
with this cycle even when there is overlap in the thresholds,
due to the design of the regulator system.
The maximum current the charge pump can supply is
dependent on the pump capacitor value and quality, the
pump frequency (nominally 130kHz), and the Rdson of the
pump FETs. The effective charge voltage for the pump
capacitor would be VSYS – 2 * VDIODE. The total charge
transfer would then be CPUMP * (VSYS – 2*VDIODE).
Multiplying by the switch frequency gives the theoretical
current the pump can transfer: FPUMP * CPUMP * (VSYS –
2*VDIODE).
NOTE: There is also another smaller, fully integrated
charge pump (Trickle Charge Pump - see Figure 2), which is
used to maintain the High Side drivers’ gate VGS in 100
percent duty cycle modes.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PCZ33999CEK | 制造商:Freescale Semiconductor 功能描述:16 LOW SIDE PWM&SPI - Rail/Tube |
| PD 1/2-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 12.7MM PK100 |
| PD 1/4-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 6.4MM PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 6.4MM, PK100 制造商:TE Connectivity / Raychem 功能描述:HEATSHRINK, END CAP, 6.4MM, PK100; I.D. Supplied - Metric:6.4mm; I.D. Supplied - Imperial:0.251"; I.D. Recovered Max - Metric:2mm; I.D. Recovered Max - Imperial:0.078"; Shrink Ratio:3:1; Shrink Tubing / Boot Material:PO (Polyolefin);;RoHS Compliant: Yes |
| PD 1/8-0 | 制造商:TE Connectivity 功能描述:HEATSHRINK END CAP 3.2MM PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 3.2MM, PK100 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 3.2MM, PK100, I.D. Supplied - Metric:3.2mm, I.D. Supplied - 制造商:TE Connectivity 功能描述:HEATSHRINK, END CAP, 3.2MM, PK100, I.D. Supplied - Metric:3.2mm, I.D. Supplied - Imperial:0.125", I.D. Recovered Max - Metric:0.58mm, I.D. Recovered Max - Imperial:0.022", Shrink Ratio:3:1, Shrink Tubing / Boot Material:PO , RoHS Compliant: Yes |
| PD 2436 | 制造商:Osram Opto semiconductors 功能描述:Bulk |
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