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MAX8555A Evaluation Kit
GATE Drive
The GATE pin on the MAX8555A controller provides the
necessary gate drive for both MOSFETs in each circuit
on the EV kit. The GATE voltage can be monitored with
an oscilloscope (10M ? impedance) connected to test
point TP1 or TP2 on the EV kit board, and should read
5V (typ) above the CS+ voltage. During startup, the
GATE voltage ramp-up time is determined by the
charge-pump frequency that is programmed by the
TIMER pin.
TIMER
The MAX8555A controller features a dual-purpose
and sets the charge-pump frequency to 500kHz. An
open-drain/open-collector transistor can also be con-
nected to the TIMER PC pad to control the MAX8555A
controller. Assert a logic-low signal (below 0.5V) to the
TIMER pad to shut down the controller. Verify that the
shunts are removed from jumpers JU1 and JU2 when
using an external device to control the MAX8555A. See
Table 2 for jumpers JU1 and JU2 configuration.
The charge-pump frequency can be adjusted between
100kHz and 500kHz by replacing resistor R7 or R15.
Use the following equation to select a new 1% toler-
ance resistor value for R7 or R15.
TIMER input that sets the charge-pump frequency or
functions as a logic enabler. The MAX8555A EV kit cir-
cuits provide two 2-pin jumpers, JU1 and JU2, to con-
figure the TIMER pin. Place a shunt across jumper JU1
R TIMER =
1 . 25 V
f
100 μ A -
5kHz/ μ A
or JU2 to connect the TIMER pin to ground through
resistor R7 or R15 to set the charge-pump frequency to
250kHz. Removing the shunts from jumper JU1 or JU2
leaves the TIMER pin floating on the associated circuits
Table 1. MAX8555A FAULT MODES
where f is the desired charge-pump frequency in kHz
and R TIMER is the value of resistor R7 or R15.
FAULT MODE
V DD OVP
Undervoltage Protection
Overvoltage Protection
EV KIT CONDITIONS
V DD > 14.4V (typ)
V IN 1 or V IN 2 < 0.75V
V OUT > 2V and V IN 1 or V IN 2 >
V OUT + 0.01V
MOSFETs
Off
Off
Off
FAULT1 AND
FAULT2 OUTPUT
Low
Low
Low
LATCHING
No
No
Yes
V IN 1 or V IN 2 < V OUT - 0.02V and
Reverse-Current Protection
MOSFETs are ON for t > 4.1ms
(when shunts are connected across
Off
Low
Yes
JU1 or JU2 t > 8.2ms)
Table 2. Jumpers JU1 and JU2
SHUNT LOCATION
Installed
Not installed
TIMER PIN
Connected to ground through resistor
R7/R15
Floating
(connected to the TIMER PC pad*)
EV KIT FUNCTION
Normal operation, charge-pump
frequency programmed to 250kHz,
blank time = 8.2ms
Normal operation, charge-pump
frequency defaults to 500kHz,
blank time = 4.1ms
* User may connect to the TIMER PC pad and supply a logic-high signal of 2.5V or 3.3V.
4
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MAX8555EUB-T 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube
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