BD62013FS ROHM [Rohm], BD62013FS Datasheet - Page 4

• Manufacturer Part Number: BD62013FS
• Description: Three phase brushless fan motor controller
• Manufacturer: ROHM [Rohm]

http://www.rohm.com
© 2012 ROHM Co., Ltd. All rights reserved.
TSZ22111 · 15 · 001
BD62013FS
10) Overcurrent protection (OCP) circuit
11) External fault signal input pin (FIB pin, low active)
8) Output duty pulse width limiter
9) Phase control setting
PWM switching duty pulse width limitation is provided to ensure proper external level shifter and power transistor
switching. Because of the pulse width limitation, the controller will not output a pulse of less than T
nor can it output a duty pulse of D
Also, since the upper and lower external power transistors cannot be turned on simultaneously, the controller is shut off
for the period T
Therefore, the switching maximum duty at the motor starts up is 90 percent (nominal).
The driving signal phase can be advanced to the hall signal - (Phase control). The lead angle is set by forcing the DC
voltage to the PC pin. The input voltage is converted digitally with the 6-bit A/D converter, in which internal VREG voltage
is assumed to be full-scale, and the converted data is processed by logic circuit. The lead angle can be set from 0° to
+30° at 1° intervals, and updated fourth hall cycle of phase W falling edge.
For the phase control function to operate is only 150° commutation mode. However, the controller forces PC pin voltage
to ground (no lead angle) when the testing mode.
The VSP offset voltage (Figure 29) is buffered to PCT pin, to connect an external resistor between PCT pin and ground.
The internal bias current is determined by PCT voltage and the resistor value - V
result, the lead angle setting is followed with the duty control voltage, and the performance of the motor can be improved.
Please select the R
capability is a 100µA or less.
The over current protection circuit can be activated by connecting a low value resistor for current detection between the
external output stage ground and the controller IC ground. When the RCL pin voltage reaches or surpasses the threshold
value, the controller forces all the upper switching arm imports low (UH, VH, WH = L, L, L), thus initiating the overcurrent
protection operation. When the RCL pin voltage swings below the ground, it is recommended to insert a resistor - 1.5kΩ
or more - between RCL pin and current detection resistor because of the malfunction prevention. Since this protection
circuit is not a latch type, it returns to normal operation - synchronizing with the carrier frequency - once the RCL pin
voltage falls below the threshold voltage. A filter is built into the overcurrent detection circuit to prevent malfunctions, so
that the protection function does not activate when a short pulse of less than T
The FIB pin can force all controller driver outputs low at any time. The FIB pin is pulled up to VREG internally by a 100kΩ
resistor, therefore, an open drain output can be connected directly. It is recommended to pull up to VREG voltage when
this function is not used and malfunctioning because of the noise.
DT
V
V
SPMIN
SPMIN
VSP
VSP
L.A.
L.A.
(1.6µs minimum) at the upper and lower part of each phase output (for example, UH and UL).
PCT
value from 50kΩ to 200kΩ in the range on the basis of 100kΩ, because the PCT pin current
ADC
ADC
V
V
PCT
PCT
= VSP-V
MAX
= VSP-V
Fig. 4 Phase control setting example 1
Fig. 5 Phase control setting example 2
V
R
or more, because the controller does not keep the external power transistors full on.
V
R
PCT
PCT
PCT
PCT
SPMIN
SPMIN
PCT
PC
PCT
PC
R
R
R
PCL
VREG
PCH
PCL
4/20
R
R
PCT
PCT
L.A.
L.A.
RCL
is input.
PCT
TSZ02201-0828ABB00030-1-2
/ R
PCT
-, and mix to PC pin. As a
01.JUN.2012 Rev.001
VSP
VSP
MIN
(0.8µs minimum),
Datasheet
Datasheet